JP4108238B2 - Vapor phase polymerization method and vapor phase polymerization apparatus, and polymer mass crushing apparatus therefor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  In the present invention, when polymer powder is extracted from a fluidized bed reactor via a powder extraction line and conveyed, the polymer lump contained in the polymer powder is crushed and the equipment downstream thereof, for example, The present invention relates to a gas phase polymerization method and a gas phase polymerization apparatus capable of preventing clogging of rotating machines, piping, valves and the like, and a polymer lump disintegration apparatus therefor.
[0002]
[Prior art]
  Conventionally, for example, when a polyolefin such as polyethylene is obtained, a gas phase polymerization method in which an olefin monomer such as ethylene is gas phase polymerized in a fluidized bed reactor in the presence of a solid catalyst has been used.
[0003]
  Such a gas phase polymerization method is:FIG.A gas phase polymerization apparatus as shown in FIG. That is,Fluidized bed reactor 1The solid catalyst A isSupply line 5And more gaseous olefinsSupply line 2FromBlower (not shown)ThroughFluidized bed reactor 1It comes to be supplied from the bottom. This supplied gaseous olefin isFluidized bed reactor 1It consists of a perforated plate placed near the bottom of theDispersion plate 7ThroughFluidized bed 8Forming thisFluidized bed 8Is maintained in a fluid state. At this time,Fluidized bed 8The polymerization reaction takes place within.
[0004]
  And the produced polymer particles arePowder extraction line 4ThroughExtraction pot 6Is continuously extracted,Solid-gas separation containers 11 and 12It is separated into solid and gas. On this occasion,Valves 13 and 14IsControlled as appropriate. The polymer powder extracted in this way isRotary valve 15, 16By operatingConveyance line 17To be transported toPolymer powder tank 18FromVibrating sieve device 20Only the powder of a certain size isExtruder 21To obtain a pellet-like polyolefin.
[0005]
  on the other hand,Fluidized bed 8Unreacted gaseous olefins that passed throughFluidized bed reactor 1Provided in the upper part ofDeceleration area 9The flow rate is reduced,Fluidized bed reactor 1Through the gas outlet at the top ofFluidized bed reactor 1It is designed to be discharged to the outside.
[0006]
  Although not shown, thisFluidized bed reactor 1The unreacted gaseous olefin discharged from the reactor is cooled by a heat exchanger (cooling device) through a circulation line, and againFluidized bed reactor 1InsideFluidized bed 8It is supplied continuously.
[0007]
  By the way, in such a gas phase polymerization method,Fluidized bed reactor 1FromExtraction line 4In the polymer powder extracted through, not only the polymer powder,Fluidized bed reactor 1Polymer masses formed within may be entrained,Downstream valves 13, 14Such as valves, piping,Rotary valve 15, 16Such as rotating machines may be blocked.
[0008]
[Problems to be solved by the invention]
However, when such a blockage occurs, it is necessary to open and clean the part, but switching operation to a spare line, purging of flammable gas, nitrogen purge for recovery, polymerization reaction such as residual moisture and oxygen Complicated work such as confirmation of inhibitory substances is required.
[0009]
  Furthermore, if the purge is insufficient, the polymerization reaction may be hindered and deactivated. On the other hand,Of such a high pressure sectionIn place of the method of taking out the lump, a lump collecting device and a crushing device are also arranged in the low pressure part of the downstream part of the powder extraction line. In this case, in the upstream part, If the valve, piping, or the like is clogged by a lump, powder cannot be extracted, and the entire plant may have to be stopped to perform repair work.
[0010]
  In view of such a situation, the present invention pulverizes the polymer mass contained in the polymer powder when the polymer powder is extracted from the fluidized bed reactor via the powder extraction line and conveyed. To provide a gas phase polymerization method and a gas phase polymerization apparatus capable of preventing clogging of downstream equipment such as rotating machines, piping, valves, etc., and a polymer lump disintegration apparatus therefor With the goal.
[0011]
[Means for Solving the Problems]
  The present invention has been made in order to achieve the above-mentioned problems and objects in the prior art, and the gas phase polymerization method of the present invention supplies a solid catalyst for polymerization into a fluidized bed reactor. At the same time, monomer gas is blown into the fluidized bed reactor from the bottom of the fluidized bed reactor through the dispersion plate to form a fluidized bed in the fluidized bed reactor, and the gas phase polymerization reaction in the fluidized bed reactor In the gas phase polymerization method for producing a polymer by the above, in the upstream portion of the powder extraction line for extracting the polymer powder from the fluidized bed reactor, a polymer mass contained in the polymer powder is arranged. It is characterized by crushing.
[0012]
  The gas phase polymerization apparatus of the present invention supplies a solid catalyst for polymerization into the fluidized bed reactor, and introduces monomer gas into the fluidized bed reactor from the bottom of the fluidized bed reactor via a dispersion plate. A gas phase polymerization apparatus for producing a polymer by a gas phase polymerization reaction in the fluidized bed reactor by blowing, forming a fluidized bed in the fluidized bed reactor,
  A crushing device for crushing a polymer lump is disposed upstream of a powder extraction line for extracting the polymer powder from the fluidized bed reactor.
[0013]
  in this way,Since the crushing device is disposed upstream of the powder extraction line for extracting the polymer powder from the fluidized bed reactor, the polymer mass contained in the polymer powder is crushed, that is, cut into strips, Since the size can be reduced and sent to the downstream part of the powder extraction line, clogging of equipment such as rotating machines, piping, valves, etc., located downstream of the powder extraction line can be prevented.
[0014]
  Furthermore, in this invention, the said crushing apparatus is
  A casing body;
  A crushing space formed inside the casing body;
  A powder inlet opening above the casing body and communicating with the crushing space;
  A powder outlet opening below the casing body and communicating with the crushing space;
  In the crushing space, a rotary shaft pivotally supported so as to be rotatable in a vertical direction with respect to the powder introduction port and the powder discharge port that are opened up and down in a rotatable manner,
  A plurality of rotary blades that are fixed to the rotary shaft at a constant interval in the axial direction and are shifted from each other by a constant angular phase in the rotational direction, and that rotate in the crushing space;
  In the crushing space, a plurality of fixed comb blades that are fitted in the gap in the axial direction of the rotary blade and arranged so as to be in sliding contact with the rotary blade,
  The polymer lump contained in the powder introduced from the powder inlet is configured to be crushed between the fixed comb blade and the rotary blade.
[0015]
  Moreover, the apparatus for crushing a polymer lump according to the present invention comprises:While supplying the solid catalyst for polymerization into the fluidized bed reactor, the monomer gas is fed into the fluidized bed reactor from the bottom of the fluidized bed reactor through the dispersion plate. A crushing apparatus for crushing the polymer mass in the production of a polymer by gas phase polymerization reaction in the fluidized bed reactor by blowing and forming a fluidized bed in the fluidized bed reactor. The crushing device isA casing body, a crushing space formed inside the casing body, a powder inlet opening above the casing body and communicating with the crushing space, and a crushing space opened below the casing body. A powder discharge port that communicates with the space, a powder introduction port that is rotatably opened in the crushing space, and a rotary shaft that is rotatably supported in a direction perpendicular to the powder discharge port. A plurality of rotary blades that are fixed to the rotary shaft at a predetermined interval in the axial direction and are shifted from each other by a constant angular phase in the rotational direction, and that rotate in the crushing space; A plurality of fixed comb blades that are fitted in the space in the axial direction of the rotary blade and arranged to be in sliding contact with the rotary blade, and are included in the powder introduced from the powder introduction port. The polymer mass to be crushed between the fixed comb blade and the rotary blade Characterized by being configured.
[0016]
  By comprising in this way, it extracted via the powder extraction line and was introduced into the crushing space formed in the inside of the casing body from the powder introduction port.Out of polymer powderThe powder of a certain size (thickness) or less falls downward from the gaps between the plurality of fixed comb blades and is discharged from the casing body through the powder discharge port.
[0017]
  On the other hand, among the polymer powders introduced into the crushing space, polymer masses larger than a certain size are collected on the upper parts of the plurality of fixed comb blades, and a plurality of rotating blades rotating in the rotating crushing space. As it rotates, it is crushed between a plurality of fixed comb blades arranged so as to be in sliding contact with the rotary blade, its size is reduced, and it falls downward from the gaps of the plurality of fixed comb blades. And discharged from the casing body through the powder discharge port.
[0018]
  Therefore, the polymer lump contained in the polymer powder can be crushed and its size can be automatically reduced, so that it is located downstream, for example, in rotating machines, piping, valves, etc. It is possible to prevent clogging of equipment such as. In addition, because of this structure, there is no need for complicated work such as discharging the lump collected in the crushing device out of the system, which can be used to reduce personnel and stop the operation. There is no need to do anything. Moreover, since it is not an open operation, there is no possibility that the polymerization reaction will be deactivated even if it is provided in the high-pressure section due to insufficient purge as in the prior art.
[0019]
  Further, in the polymer lump crushing apparatus of the present invention, the rotary blade is provided with a blade edge portion formed in a tapered shape in which a side portion is inclined toward a central portion on one surface side of the rotary blade. Features.
[0020]
  As described above, since the blade edge portion is formed so as to be inclined toward the central portion on the one surface side of the rotary blade, when the rotary blade rotates and crushes the polymer lump, a plurality of fixed portions are provided. The lump collected at the upper part of the comb blade enters the gap between the rotating blades by the action of this tapered blade edge portion with the rotation of the rotating blade, and moves toward the center. Thickness) can be crushed below.
[0021]
  Furthermore, the polymer lump crushing apparatus of the present invention is characterized in that the rotary blade is configured such that the blade edge portion is formed on both sides and the rotation shaft is reversible. To do.
[0022]
  By configuring in this way, rotating the rotary blade in the same direction only crushes the lump collected at the top of the plurality of fixed comb blades at the same location, so the top of the fixed comb blade May remain in the upper part of the fixed comb blade without falling down from the gap of the fixed comb blade, but by rotating the rotary blade in the reverse direction, The lump remaining in the upper part is crushed at a different location, the size becomes smaller, and it can fall downward from the gap of the fixed comb blade.
[0023]
  Furthermore, in the crushing apparatus of the present invention, the rotary blade is formed on the surface of the rotary blade with the tip of the rotary blade facing the central portion in the axial direction centered on the axial center of the rotary shaft. It is characterized in that the cutting edge portions on both sides thereof are formed in a target direction with the central portion in the axial direction of the shaft as a center.
[0024]
  By configuring in this way, as the lump collected on the top of the plurality of fixed comb blades is crushed by the rotation of the rotary blade, it is gradually moved to the axial central portion of the rotary shaft, By crushing, the lump can be crushed at different places and fall completely downward from the gap of the fixed comb blade.
[0025]
  Therefore, since the size of the polymer lump contained in the powder can be reduced, clogging of equipment located downstream, for example, rotating machines, piping, valves, etc. is prevented. be able to. In addition, because of this structure, there is no need for complicated work such as discharging the lump collected in the crushing device out of the system, which can be used to reduce personnel and stop the operation. There is no need to do anything. Moreover, since it is not an open operation, there is no possibility that the polymerization reaction will be deactivated even if it is provided in the high-pressure section due to insufficient purge as in the prior art.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, a gas phase polymerization method and a gas phase polymerization apparatus according to the present invention and a polymer lump crushing apparatus for the same will be described with reference to the drawings, taking a polyolefin production apparatus as an example.
[0027]
  In the present invention, the term “polymerization” may be used to mean not only homopolymerization but also copolymerization, and the term “polymer” refers not only to homopolymers but also to copolymerization. It may be used in the meaning that also includes coalescence.
[0028]
  FIG. 1 is a schematic view showing an embodiment of a gas phase polymerization apparatus according to the present invention. As shown in FIG. 1, this polyolefin production apparatus includes a fluidized bed reactor 1 for polymerizing olefins using a catalyst to obtain polyolefin powder.
[0029]
  In the fluidized bed reactor 1, the solid catalyst A for polymerization is supplied from the line 5 into the fluidized bed reactor 1, and the gaseous monomer is supplied from the supply line 2 to the fluidized bed reactor by a blower (not shown). 1 is blown into the bottom of 1 and the gaseous monomer is sent above the dispersion plate 7. Then, above the dispersion plate 7, a fluidized bed 8 is formed by the gaseous monomer to be sent and the polymer obtained by polymerization, and while maintaining the fluidized bed (reaction system) 8 in a fluidized state, A gas phase polymerization reaction is performed in the fluidized bed 8 to obtain polymer or copolymer particles or powder.
[0030]
  Here, the gaseous monomer is one or more monomers (monomer, comonomer) that are polymerized by the action of the solid catalyst for polymerization, such as olefin gas, and a molecular weight control agent such as hydrogen is used for the polymerization system. Alternatively, it may be supplied together with an inert gas such as nitrogen or hydrocarbon.
[0031]
  On the other hand, the unreacted gaseous monomer that has passed through the fluidized bed 8 is reduced in flow rate in the deceleration region 9 provided in the upper part of the fluidized bed reactor 1, and is placed in the upper part of the fluidized bed reactor 1. It is discharged to the outside of the fluidized bed reactor 1 through the gas outlet provided.
[0032]
  Although not shown, unreacted gaseous olefin discharged from the fluidized bed reactor 1 is cooled by a heat exchanger (cooling device) through a circulation line, and again in the fluidized bed reactor 1. The fluidized bed 8 is continuously supplied.
[0033]
  On the other hand, the produced polymer particles pass through the extraction pot 6 via the powder extraction line 4 and are continuously extracted, and are solid-gas separated in the solid-gas separation containers 11 and 12. On this occasion,Valves 13 and 14IsControlled as appropriate. The polymer powder extracted in this way isRotary valve 15, 16As a result of the operation, only a powder having a certain size is supplied from the polymer powder storage device 18 to the extruder 21 through the vibration sieve device 20 to obtain a pellet-like polyolefin. It has become.
[0034]
  By the way, in such a gas phase polymerization method, from the fluidized bed reactor 1,Powder extraction line 4In addition to the polymer powder, the polymer powder withdrawn through the catalyst may be accompanied by polymer agglomerates formed in the fluidized bed reactor 1.Valves 13 and 14Such as valves, piping, and rotary machines such as rotary valves 15 and 16 may be blocked.
[0035]
  Therefore, in the polymerization apparatus of the present invention,Powder extraction line 4Apart from that, in order to remove the polymer mass formed in the fluidized bed reactor 1,Powder extraction line 3The produced polymer particles arePowder extraction line 3The polymer block contained in the polymer powder is crushed by passing through the polymer block pulverization apparatus 100 of the present invention (hereinafter referred to as “pulverization apparatus”). , Reduce the size and send it to the downstream part of the powder extraction line, for example, continuously by preventing clogging of equipment located on the downstream side such as rotating machines, piping, valves, etc.It comes to be extracted.
[0036]
  Below, the crushing apparatus 100 of such this invention is demonstrated in detail based on FIGS.
  2 is a front view of the crushing apparatus of the present invention, FIG. 3 is a top view of the crushing apparatus shown in FIG. 2 taken along line III-III, and FIG. 4 is an IV of the crushing apparatus shown in FIG. -IV direction sectional view, FIG. 5 is a partial sectional view in the VV direction of the crushing apparatus shown in FIG. 4, FIG. 6 is a VI direction arrow view of the crushing apparatus shown in FIG. (A) is a partially enlarged view of the VII portion in FIG. 5, FIG. 7 (B) is an end view of FIG. 7 (A), and FIG. 8 is a relationship between the rotary blade and the fixed blade of the crushing apparatus of the present invention. It is a figure which shows a part of.
[0037]
  As shown in FIG. 2, the crushing device 100 includes a crushing device main body 102 fixed to the base frame 101, an upper pot portion 104 connected to the upper portion thereof, and a lower portion of the crushing device main body 102. And a lower pot portion 106 connected to the.
[0038]
  As shown in FIG. 1, the upper pot portion 104 is directly connected to the powder extraction line 3 of the fluidized bed reactor 1, and the lower pot portion 106 is a downstream portion of the powder extraction line, that is, the valve 13 ′. , 14 '.
[0039]
  As shown in FIGS. 2 and 4, the crusher main body 102 is fixed to the casing main body 108, the upper flange portion 110 connected to the upper portion of the casing main body 108 by the fixing bolt 109, and the lower portion of the casing main body 108. And a lower flange portion 112 connected by a bolt 111. These upper flange portion 110 and lower flange portion 112 areRespectivelyThe bolts 103 and 105 are connected to the flange 104 a of the upper pot portion 104 and the flange 106 a of the lower pot portion 106.
[0040]
  The casing main body 108 is formed with a crushing space S having a substantially cylindrical inner shape formed therein, a powder introduction port 114 that opens upward and communicates with the crushing space S, and a lower part. A powder discharge port 116 that is open and communicated with the crushing space is provided.
[0041]
  The casing main body 108 extends through the crushing space S and extends vertically with respect to the powder introduction port 114 and the powder discharge port 116 opened vertically, that is, the powder introduction port 114. A rotation shaft 118 that is rotatably supported in a direction perpendicular to the direction connecting the powder discharge ports 116 is provided.
[0042]
  That is, the shaft portions 121 and 122 at both ends of the rotating shaft 118 are respectively connected to the shaft seal yokes 125 and 127 to the roller bearings 128 and 127.Ball bearing 129Is rotatably supported by the shaft.
[0043]
  A sprocket 134 is fixed to one end 132 of the shaft portion 122, and is spanned between the sprocket 140 fixed to the shaft 138 of the drive motor 136 fixed on the base frame 101. The drive motor 136 is driven via the drive belt 142 to rotate in the A direction as shown in FIGS.
[0044]
  The rotational speed of the rotating shaft 118 may be set as appropriate according to the type of polymer particles, the properties of the lump, and the like, and is not particularly limited. 10 to 100 rpm is desirable.
[0045]
  As shown in FIGS. 3 to 8, a plurality of rotary blades 120 are fixed to the rotary shaft 118 at a predetermined interval L in the axial direction of the rotary shaft 118. Further, as shown in FIG. 8, these rotary blades 120 are fixed to each other in the rotational direction.Angle αThe phase is shifted and fixed. In addition, thisAngle αIs set as appropriate, and considering the crushing efficiency, it is preferably set to 15 to 60 °.
[0046]
  In addition, as shown in FIGS.Rotary blade body 123And both edge portions have blade edge portions 124 and 126 formed in a tapered shape inclined toward the central portion on one surface side of the rotary blade.
[0047]
  In addition, as described later, when the rotary blade 120 is rotated in the same direction as shown in FIG. 8, the rotary blade body 123 and the both side edge portions 124 and 126 are provided as described below. Since the lump B collected on the tops of the plurality of fixed comb blades 130 is only crushed at the same location, the fixed comb blades 130 remain in the state of being collected on top of the fixed comb blades 130. Does not fall downward from the gap,Fixed comb blade 130By rotating the rotary blade 120 in the opposite direction,Fixed comb blade 130The lump that remains on the top of the crushed material is crushed at different locations and the dimensions are reduced.Fixed comb blade 130This is so that it can fall downward from the gap.
[0048]
  Further, as shown in FIG. 6, the rotary blade 120 is arranged in the axial direction of the rotary shaft.Central part PAre formed on the surface facing the central portion in the axial direction, and both sides of the central portion in the axial direction of the rotary shaft 118 (in FIG. 6). The upper and lower rotary blades 120 and the blade edge portions 124 and 126 with respect to the central portion P are formed in a target direction.
[0049]
  With this configuration, as described later, the upper portions of the plurality of fixed comb blades 130 are arranged.Crushing space S 'As the lump B collected by the rotary blade 120 is crushed by the rotation of the rotary blade 120,Central part PThe lump B is crushed at a different location by crushing, and can be completely dropped from the gap 133 of the fixed comb blade 130 by crushing.
[0050]
  The taper angles of the blade edge portions 124 and 126 are not particularly limited, and are preferably 15 to 45 ° in consideration of cutting torque, that is, power.
  On the other hand, as shown in FIGS. 6 and 8, a plurality of semicircular fixed comb blades 130 are fixed in the casing main body 108 below the crushing space S. Each of the fixed comb blades 130 is disposed so as to fit in the axial gap 131 of the rotary blade 120 and to be in sliding contact with the surface of the rotary blade 120. That is, the thickness of the fixed comb blade 130 is substantially the same as the distance L between the rotary blades 120, and the distance between the rotary blades 120 is the crushing dimension (thickness) of the lump B. It has become.
[0051]
  The distance l between the fixed comb blades 130 is substantially the same as the thickness of the rotary blade 120.
  Therefore, by the rotation of the rotary blade 120, the lump B crushed between the rotary blade 120 and the fixed comb blade 130 falls from between the fixed comb blades 130 and passes through the powder discharge port 116. In order to discharge to the outside, at least the distance L between the rotary blades 120 needs to be equal to or smaller than the distance l between the fixed comb blades 130.
[0052]
  Such distances L, l are downstreamValve 13 ', 14'Such as valves, piping,Rotary valve 15, 16What is necessary is just to set suitably according to these dimensions so that rotary machines, such as, may not be obstruct | occluded, and it does not specifically limit.
[0053]
  Therefore, according to the crushing apparatus 100 of the present invention configured as described above, the polymer particles generated in the fluidized bed reactor 1 are:Powder extraction line 3Through the lump disintegrating device 100, the lump of polymer contained in the polymer powder is crushed, its size is reduced and sent to the downstream part of the powder extraction line, For example, it is continuously extracted by preventing clogging of equipment located on the downstream side, for example, rotating machines, piping, and valves.
[0054]
  That is,Powder extraction line 3The polymer powder withdrawn from the fluidized bed reactor 1 from the upper pot 104 of the crushing apparatus 100 through the powder inlet 114 formed in the upper part of the casing main body 108 is passed through the casing main body 108. Is introduced into the crushing space S.
[0055]
  At this time, the powder of a certain size or less falls downward from the gap 133 of the fixed comb blade 130 and is discharged from the lower pot portion 106 to the outside of the crushing device 100 through the powder discharge port 116.Powder extraction line 3Downstream ofValve 13 ', 14'Solid-gas separation in solid-gas separation containers 11 and 12Rotary valve 15, 16As a result of the operation, only a fixed size of powder is supplied to the extruder 21 from the powder storage device 18 via the vibrating sieve device 20 and a pellet-shaped polyolefin is obtained. ing.
[0056]
  Moreover, as shown in FIG. 8, the block B having a certain size or more is formed at the upper part of the plurality of fixed comb blades 130.Crushing space S 'InCollectedThe crushing apparatus 100 is crushed by the rotation of the rotary blade 120 and falls downward from the gap 133 of the fixed comb blade 130 in the same manner as described above, and from the powder discharge port 116 through the lower pot portion 106. Is discharged outside.
[0057]
  At this time, as described above, the axial direction of the rotating shaft 118Central part PGradually moved to break upThereforeThe lump B is crushed at a different location so that it can fall completely downward from the gap 133 of the fixed comb blade 130.
[0058]
  In addition, as shown in FIG. 8, when the rotary blade 120 is rotated in the same direction, the mass B collected on the upper portions of the plurality of fixed comb blades 130 is only crushed at the same location, In the state where it is collected on the upper part of the fixed comb blade 130, it does not fall downward from the gap of the fixed comb blade 130,Fixed comb blade 130May remain at the top of
[0059]
  For this reason, by rotating the rotary blade 120 in the reverse direction after a certain period of time by a control device (not shown),Fixed comb blade 130The lump B remaining on the top of the crushed material is crushed at a different location, and the dimensions become smallerFixed comb blade 130Can be dropped downward from the gap.
[0060]
  Therefore, the present inventionCrusher 100According to the present invention, it is possible to automatically reduce the size of the polymer agglomerate contained in the powder, so that the equipment located on the downstream side thereof, for example, rotating machines, piping, valves, etc. Can be prevented. In addition, because of this structure, there is no need for complicated work such as discharging the lump collected in the crushing device out of the system, which can be used to reduce personnel and stop the operation. There is no need to do anything. Moreover, since it is not an open operation, there is no possibility that the polymerization reaction will be deactivated even if it is provided in the high-pressure section due to insufficient purge as in the prior art.
[0061]
  The preferred embodiment of the present invention has been described above, but the present invention is not limited to this. For example, the crushing apparatus of the present invention may be provided in the downstream portion of the powder extraction line, or a plurality of them may be provided. Various modifications are possible without departing from the object of the present invention.
[0062]
【The invention's effect】
  According to the present invention, the powder is extracted through the powder extraction line and introduced into the crushing space formed inside the casing body from the powder introduction port.Out of polymer powderThe powder of a certain size (thickness) or less falls downward from the gaps between the plurality of fixed comb blades and is discharged from the casing body through the powder discharge port.
[0063]
  On the other hand, among the polymer powders introduced into the crushing space, polymer masses larger than a certain size are collected on the upper parts of the plurality of fixed comb blades, and a plurality of rotating blades rotating in the rotating crushing space. As it rotates, it is crushed between a plurality of fixed comb blades arranged so as to be in sliding contact with the rotary blade, its size is reduced, and it falls downward from the gaps of the plurality of fixed comb blades. And discharged from the casing body through the powder discharge port.
[0064]
  Therefore, the polymer lump contained in the polymer powder can be crushed and its size can be automatically reduced, so that it is located downstream, for example, in rotating machines, piping, valves, etc. It is possible to prevent clogging of equipment such as. In addition, because of this structure, there is no need for complicated work such as discharging the lump collected in the crushing device out of the system, which can be used to reduce personnel and stop the operation. There is no need to do anything. Moreover, since it is not an open operation, there is no possibility that the polymerization reaction will be deactivated even if it is provided in the high-pressure section due to insufficient purge as in the prior art.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an embodiment of a gas phase polymerization apparatus according to the present invention.
FIG. 2 is a front view of the crushing apparatus of the present invention.
FIG. 3 is a top view of the crushing apparatus shown in FIG. 2 taken along line III-III.
4 is a cross-sectional view of the crushing apparatus shown in FIG. 3 in the IV-IV direction.
FIG. 5 is a partial cross-sectional view in the VV direction of the crushing apparatus shown in FIG. 4;
6 is a view in the direction of arrow VI of the crushing apparatus shown in FIG. 5. FIG.
7A is a partially enlarged view of a VII portion in FIG. 5, and FIG. 7B is an end view of FIG. 7A.
FIG. 8 is a diagram schematically showing a part of the relationship between the rotary blade and the fixed blade of the crushing apparatus of the present invention.
[Explanation of symbols]
    1 Fluidized bed reactor
    2 Supply line
3 Powder extraction line
4 Powder extraction line
5 Supply line
6 Extraction pot
    7 Dispersion plate
    8 Fluidized bed
    9 Deceleration area
  11 Solid-gas separation container
12 Solid-gas separation container
  13 Valve
  13 'valve
14 valves
14 'valve
15 valves
  16 Rotary valve
  17 Transport line
  18 Powder storage device
  20 Vibrating sieve device
  21 Extruder
100 Crusher
101 Base frame
102 Crusher body
103 volts
104a Flange
104 Upper pot
106a flange
106 Lower pot
108 Casing body
109 Fixing bolt
110 Upper flange
111 Fixing bolt
112 Lower flange
114 Powder inlet
116 Powder outlet
118 Rotating shaft
120 Shaft
120 rotary blade
121 Shaft
122 Shaft
123 Rotary blade body
124 Cutting edge
125 shaft seal yoke
126 Cutting edge
127 Shaft seal yoke
128 Roller bearing
129 Ball bearing
130 Fixed comb blade
131 gap
132 One end
133 gap
134 Sprocket
136 Drive motor
138 shaft
140 Sprocket
142 Drive belt

Claims (8)

While supplying the solid catalyst for polymerization into the fluidized bed reactor, the monomer gas is blown into the fluidized bed reactor from the bottom of the fluidized bed reactor through the dispersion plate, and the fluidized bed reactor is filled with the fluidized bed reactor. In a gas phase polymerization method for producing a polymer by a gas phase polymerization reaction in the fluidized bed,
A crushing device is arranged upstream of a powder extraction line for extracting the polymer powder from the fluidized bed reactor so as to crush the polymer lump contained in the polymer powder. Gas phase polymerization method. The crushing device is
A casing body;
A crushing space formed inside the casing body;
A powder inlet opening above the casing body and communicating with the crushing space;
A powder outlet opening below the casing body and communicating with the crushing space;
In the crushing space, a rotary shaft pivotally supported so as to be rotatable in a vertical direction with respect to the powder introduction port and the powder discharge port that are opened up and down in a rotatable manner,
A plurality of rotary blades that are fixed to the rotary shaft at a constant interval in the axial direction and are shifted from each other by a constant angular phase in the rotational direction, and that rotate in the crushing space;
In the crushing space, a plurality of fixed comb blades that are fitted in the gap in the axial direction of the rotary blade and arranged so as to be in sliding contact with the rotary blade,
2. The gas according to claim 1, wherein the polymer lump contained in the powder introduced from the powder inlet is crushed between the fixed comb blade and the rotary blade. Phase polymerization method. While supplying the solid catalyst for polymerization into the fluidized bed reactor, the monomer gas is blown into the fluidized bed reactor from the bottom of the fluidized bed reactor through the dispersion plate, and the fluidized bed reactor is filled with the fluidized bed reactor. A gas phase polymerization apparatus for producing a polymer by a gas phase polymerization reaction in the fluidized bed,
A gas phase polymerization apparatus characterized by disposing a crusher for crushing a polymer lump in an upstream portion of a powder extraction line for extracting polymer powder from the fluidized bed reactor. The crushing device is
A casing body;
A crushing space formed inside the casing body;
A powder inlet opening above the casing body and communicating with the crushing space;
A powder outlet opening below the casing body and communicating with the crushing space;
In the crushing space, a rotary shaft pivotally supported so as to be rotatable in a vertical direction with respect to the powder introduction port and the powder discharge port that are opened up and down in a rotatable manner,
A plurality of rotary blades that are fixed to the rotary shaft at a constant interval in the axial direction and are shifted from each other by a constant angular phase in the rotational direction, and that rotate in the crushing space;
In the crushing space, a plurality of fixed comb blades that are fitted in the gap in the axial direction of the rotary blade and arranged so as to be in sliding contact with the rotary blade,
4. The gas according to claim 3, wherein the polymer lump contained in the powder introduced from the powder inlet is crushed between the fixed comb blade and the rotary blade. Phase polymerization equipment. While supplying the solid catalyst for polymerization into the fluidized bed reactor, the monomer gas is blown into the fluidized bed reactor from the bottom of the fluidized bed reactor through the dispersion plate, and the fluidized bed reactor is filled with the fluidized bed reactor. Forming a polymer by a gas phase polymerization reaction in the fluidized bed, the crushing device for crushing the polymer mass,
The crusher is
A casing body;
A crushing space formed inside the casing body;
A powder inlet opening above the casing body and communicating with the crushing space;
A powder outlet opening below the casing body and communicating with the crushing space;
In the crushing space, a rotary shaft pivotally supported so as to be rotatable in a vertical direction with respect to the powder introduction port and the powder discharge port that are opened up and down in a rotatable manner,
A plurality of rotary blades that are fixed to the rotary shaft at a constant interval in the axial direction and are shifted from each other by a constant angular phase in the rotational direction, and that rotate in the crushing space;
In the crushing space, a plurality of fixed comb blades that are fitted in the gap in the axial direction of the rotary blade and arranged so as to be in sliding contact with the rotary blade,
The polymer block contained in the powder introduced from the powder inlet is crushed between the fixed comb blade and the rotary blade. Crushing equipment. In the rotary blade,
6. The apparatus for crushing a polymer lump according to claim 5, wherein the side portion includes a blade edge portion formed in a tapered shape inclined toward a central portion on one surface side of the rotary blade. In the rotary blade,
The apparatus for crushing a polymer lump according to claim 6, wherein the cutting edge portion is formed on both sides, and the rotating shaft is configured to be reversible. The rotary blade is
The cutting edge of the rotary blade is formed on the surface facing the central portion in the axial direction centering on the axial center of the rotary shaft, and the cutting edges on both sides of the central portion in the axial direction of the rotary shaft are the center. The apparatus for crushing a polymer lump according to claim 6 or 7, wherein the part is formed in a target direction.

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