CN201600823U - Simulation teaching device for continuous production of DOP - Google Patents

Abstract

The utility model discloses a simulated teaching device for continuously producing DOP (dioctyl phthalate), which comprises chemical equipment, a device frame and a chemical instrument, wherein the chemical equipment is arranged on the device frame; and the chemical instrument is connected with the corresponding chemical equipment. The teaching device is characterized in that the chemical equipment comprises esterification reaction equipment, dealcoholization reaction equipment, neutralization and distilled water wash equipment, air lift equipment and adsorbing and filtering equipment connected in sequence; and the device frame is arranged into an upper layer and a lower layer. The structural design of the utility model basically keeps consistent with the practical design condition of the equipment in a factory; when the utility model is used for teaching, trainees can practically learn the formation and the approximate general situation of the real chemical engineering production device, so that the trainees' understanding to various chemical equipment is improved, the practical operation level of trainees is improved, and the collaboration ability and the team spirit of trainees are cultivated.

Description

Simulation teaching device for continuous production of DOP

technical field

The utility model relates to a simulation teaching device in the field of chemical engineering, which belongs to the field of education, chemical technology and equipment technology, and is used for the integrated teaching and professional practice of chemical engineering and related majors in various colleges and universities, and for chemical engineering technicians. and senior technician training.

Background technique

Situational teaching has always been one of the main teaching methods in colleges and universities. With the continuous deepening of teaching reform, the teaching scene has also undergone major changes, especially the in-depth promotion of the integrated teaching mode of theory and practice carried out nationwide. Higher requirements have been put forward for the teaching scene, and various colleges and universities have also done a lot of work for this. At present, the main scenes of chemical engineering major teaching are roughly as follows: The first is a completely real chemical device, which is generally The original school-run factory was closed down due to various reasons, and it was directly used for teaching. Students can familiarize themselves with the chemical production process on this device, and they can also conduct simulated production drills. However, the device occupies a large area and it is impossible to use it If it is moved to the classroom, it is difficult to carry out integrated teaching of theory and reality; the second is a completely virtual chemical plant, without any real objects, everything is carried out on the computer. This kind of device does not have any physical input except the computer, and the operating cost is relatively small. The class is in the computer room, but due to the lack of real objects, it is more like playing a software game, and the integrated teaching of theory and practice cannot be realized; the third is to scale down the production device based on a real chemical product, and make It can be built into a device model and built in the classroom. The reduction ratio can be determined according to the space of the teaching site, so that the integrated teaching of theory and practice can be carried out. There is a lack of coordination between the equipment, some equipment is even smaller than the pipeline, it is difficult for students to feel that this is a chemical equipment, and most of the device frames are made of decorative materials, which do not have the sense of reality of chemical equipment. In addition, it is difficult to meet other teaching tasks.

Utility model content

In order to overcome the deficiencies in the prior art, the purpose of this utility model is to provide a practical, operable, continuous production of DOP (dioctyl phthalate) that can perfectly realize the purpose of integrated teaching of theory and practice. Simulation teaching device.

In order to achieve the above object, the utility model is achieved through the following technical solutions:

A simulation teaching device for continuous production of DOP, comprising chemical equipment, a device frame and chemical instruments, the chemical equipment is arranged on the device frame, and the chemical instruments are connected to their corresponding chemical equipment, characterized in that the chemical equipment includes Esterification reaction equipment, dealcoholization reaction equipment, neutralization water washing equipment, air stripping equipment and adsorption filtration equipment, among which, esterification reaction equipment, dealcoholization reaction equipment, neutralization water washing equipment, stripping equipment and adsorption filtration equipment are connected in sequence , while the device frame is set as upper and lower layers.

The above-mentioned esterification reaction equipment includes a reactor, a heat exchanger and a flow control device for raw materials, wherein there are 3 reactors, which are respectively the first reactor, the second reactor and the third reactor, and the sequence of the three reactors is connected, and the first reactor is a jacketed reactor, the second reactor is an inner coil reactor, and the third reactor is an outer half-pipe reactor.

Further, the above-mentioned heat exchanger is any one of a U-shaped tube heat exchanger, a floating head heat exchanger, a tube-and-tube heat exchanger, a spiral plate heat exchanger, and a plate heat exchanger.

The above-mentioned chemical instruments include flowmeters, liquid level gauges and detection instruments, and the flowmeters are any of rotameters, mass flowmeters, electromagnetic flowmeters, orifice flowmeters, and ultrasonic flowmeters. The above-mentioned liquid level gauge is a light column type liquid level gauge, and the above-mentioned detection instrument is a simulation or real instrument.

The beneficial effects of the utility model are: the structural design of the utility model is basically consistent with the actual design of the equipment in the factory, and in the process of teaching with the utility model, the students can actually understand the composition and structure of the real chemical production device. The general overview has improved the students' understanding of various chemical equipment, enhanced the students' practical operation level, and cultivated the students' cooperation ability and team awareness.

Description of drawings

Fig. 1 is the structural representation of an embodiment of the utility model;

Fig. 2 is the connection schematic diagram of each part of chemical equipment described in the utility model;

Fig. 3 is a simplified process flow diagram of an embodiment of the present invention.

The meanings of the main reference signs in the figure are:

1. Chemical equipment 2. Device frame 11. Esterification reaction equipment 12. Dealcoholization reaction equipment

13. Neutralization and washing equipment 14. Air stripping equipment 15. Adsorption and filtration equipment

Detailed ways

Below in conjunction with accompanying drawing, describe the specific embodiment of the utility model in detail:

Fig. 1 is a schematic structural diagram of an embodiment of the utility model; Fig. 2 is a schematic diagram of connection of various parts of the chemical equipment described in the utility model.

As shown in Figure 1 and Figure 2: the simulation teaching device for continuous production of DOP includes chemical equipment 1, device frame 2 and chemical instrument (not shown in the figure), chemical equipment 1 is arranged on the device frame 2, and chemical instrument is Be connected with its corresponding chemical equipment, described chemical equipment 1 comprises esterification reaction equipment 11, dealcoholization reaction equipment 12, neutralization washing equipment 13, gas stripping equipment 14 and adsorption filtration equipment 15, wherein, esterification reaction equipment 11 , dealcoholization reaction equipment 12, neutralization water washing equipment 13, stripping equipment 14 and adsorption filtration equipment 15 are sequentially connected, and the device frame 2 is arranged as upper and lower layers.

Wherein, the esterification reaction equipment 11 includes a reactor, a heat exchanger, and a flow control device for raw materials, etc., wherein there are 3 reactors, which are respectively the first reactor, the second reactor and the third reactor, and the 3 reactors The reactors are connected in sequence, and the first reactor is a jacketed reactor, the second reactor is an inner coil reactor, the third reactor is an outer half-cut tube reactor, and the heat exchanger is Any of U-shaped tube heat exchangers, floating head heat exchangers, shell and tube heat exchangers, spiral plate heat exchangers, and plate heat exchangers.

In addition, chemical instruments include flowmeters, liquid level gauges and detection instruments, and the flowmeters are any of rotameters, mass flowmeters, electromagnetic flowmeters, orifice flowmeters, and ultrasonic flowmeters. The liquid level gauge is a light column liquid level gauge, and the detection instrument is a simulation or real instrument.

Fig. 3 is a simplified process flow diagram of an embodiment of the present invention.

As shown in Figure 3: In this implementation mode, the continuous production DOP simulation teaching device is built when the net height of the construction site is 3.8 meters, and the specific process flow is as follows:

(1) Esterification The raw material phthalic anhydride (referred to as PA) from the phthalic anhydride plant is directly sent to the first reactor R011 through the outer pipe gallery, and its flow rate is controlled by a flow regulating valve; 2--ethyl alcohol (abbreviated as 2 --EH, also known as octanol) through the heat exchanger W024 and the crude ester heat exchange from the falling film evaporator W021, enter the first reactor R011, and its flow is controlled by the flow regulating valve; the catalyst is from the catalyst storage tank B012 by The catalyst is pumped out by the metering pump, and the catalyst enters the first reaction kettle R011 together with octanol. The mixed material after the reaction overflows in the second reactor R012 and the third reactor R013 successively, and supplements part octanol respectively in these each reactors simultaneously, has suitable excess alcohol to keep the latter two reactors;

Reactors R011~R013 have the same structure, with an effective volume of 32m ³ . The outer wall of the reactor is welded with a heating coil and equipped with a stirrer. The single-pass conversion rate of each reactor is 60%. The heat source of the reactor is provided by 4MPa high-pressure steam. , the temperature of the reactor is adjusted by a regulating valve;

The crude ester (acid value≤0.5mgKOH/g, excess alcohol 16%) generated by the reaction flows into the first crude ester tank B021, and is then pumped to the dealcoholization device 12 with the crude ester.

(2) Dealcoholization The water generated by each reactor and the evaporated alcohol form an azeotrope, evaporate and leave the reactor and then enter the alcohol distillation tower K011, where the alcohol distillation tower K011 is in reverse contact with the reflux alcohol at the top of the tower, and the alcohol distillation tower K011 Alcohol with higher purity can be obtained at the bottom of the tower and returned to the first reaction kettle R011. On the other hand, water, low boilers and part of the alcohol are distilled from the top of the alcohol distillation tower K011, condensed and cooled by the condensing cooler W012, and then enter the separation tank B043, in the separation tank B043, the alcohol and the reaction water are separated, the alcohol overflows from the upper part to the alcohol collection tank B011, and then the alcohol reflux pump returns to the alcohol distillation tower K011 as reflux liquid, and the water separated from the separation tank B043 Send in the water collection tank B031 of neutralization washing equipment 13;

The crude ester from the esterification process is pumped into the falling film evaporator W021 through the crude ester pump, and the excess alcohol is evaporated by relying on its own heat under negative pressure. The lower part of the falling film evaporator W021 is equipped with a series of tubes Type heat exchanger, with Pall ring packing on the upper part, the pressure at the top of the tower is 5KPa, the vacuum is maintained by a liquid ring vacuum pump, the evaporated alcohol is discharged from the top of the tower, condensed by the condenser W022, and the condensed alcohol flows into the alcohol collection tank B011, continue to be used as circulating alcohol;

The crude ester after de-alcoholization (alcohol content<2.0%) flows from the bottom of the falling film evaporator W021 to the second crude ester tank B022 in sequence, and the crude ester is pumped to the shell and tube heat exchanger W024 by the crude ester Carry out heat exchange with the alcohol from the boundary area, send in the neutralization washing equipment 13 after cooling.

(3) The crude ester after neutralizing the water to elute the alcohol is sent to the neutralizing agitator R031, and the water collection tank B031 collects the reaction water in the esterification equipment, the condensed water of the stripping equipment 14, and the partial steam condensed water of the device , 20% NaOH solution from the alkali distribution tank, dilute the alkali concentration to about 0.3-0.5% in the water collection tank B031, and pump it to the agitator R031 by alkaline water;

In the R031, the ester and the dilute lye are stirred and mixed, and the sampling analysis shows that the acid value is ≤0.05mgKOH/g, and the material overflows to the sedimentation separation tank B032 by gravity, and the ester and water phases are separated in the sedimentation separation tank B032, and the water phase is separated from the sedimentation The bottom of the tank B032 flows into the sewage system, and the ester phase overflows from the upper part into the third crude ester tank B041, and is sent to the stripping device 14.

(4) The crude ester after stripping and washing is sent to the heat exchanger W043 by the crude ester pump P041 to exchange heat with the refined hot ester in the drying tower K042, and then enters the stripping tower K041 for vacuum stripping. 5KPa, direct steam pressure 2.0MPa, flow rate is 10% of the ester input, the crude ester is extracted from the bottom of the tower, and then further vacuum flashed through the drying tower K042 (absolute pressure ≤ 3KPa), so that the content of water and alcohol low boilers is further increased. Then it flows from the bottom of the K042 tower into the sealed tank B042, and then it is pumped out by the refined ester pump, and after heat exchange and cooling with the crude ester pumped out by the heat exchanger W043, it enters the adsorption filtration device 15.

The tower top gas with water content of 96% enters the tower top condensation cooler W042, the condensate is collected in the separation tank B043, alcohol and low boilers overflow to the alcohol collection tank B011 from the upper part, water flows into the water collection tank B031 from the bottom, and condenses The final exhaust gas is discharged into the air through the vacuum pump.

(5) The material after adsorption, filtration and stripping enters the decolorization kettle R051 with nitrogen seal and adds activated carbon, and performs adsorption decolorization under stirring, and then is pumped out by the pump, filtered by the coarse filter F051, and then passed through the product cooler W051 flows into the product tank as a product after cooling to 50°C.

In the specific implementation process, the size of each equipment can be determined according to the actual situation of the selected training site, and the construction drawing design of the device frame and equipment layout can be carried out. In the design process, the teaching function is fully considered to leave enough teaching space. , the device frame 2 is designed as upper and lower floors, and the height of each floor is more than 1.8 meters, which ensures that people of general height (below 1.8 meters) can operate freely on both floors. The frame adopts carbon steel structure, and the frame columns are selected 16 No. I-beam, the main beam and secondary beam of the frame are all made of No. 12 channel steel, and the columns, main beam and secondary beam are connected by welding. In addition, the chemical equipment is made of stainless steel. Considering the teaching needs, different types of equipment are used, such as different heat transfer Reactors of different types, different types of heat exchangers, chemical equipment 1 and device frame 2 are connected by welding or bolts through lugs or legs.

According to the process flow chart, process pipes are used to connect each chemical equipment 1 to form a process flow. The process pipes and chemical equipment 1 are connected by flanges. The pipe fittings in the pipeline, such as elbows and tees, are connected by welding. The valves in the pipeline are welded or threaded according to the type of valves selected, and the chemical instruments in the pipeline are respectively welded or threaded according to the types of instruments selected; the construction process should be carried out in strict accordance with various construction specifications of chemical equipment, Ensure that the device is no different from the real chemical production device.

In addition, in the process of process configuration and chemical equipment 1 layout of this device, some incomplete and unreasonable places can be left intentionally, the purpose of which is to cultivate the process analysis ability of trainees (students or enterprise employees), as well as the ability of technical transformation and technical measures , the utility model is particularly suitable for the training of technicians and senior technicians.

The utility model has been disclosed above with preferred embodiments, but it is not intended to limit the utility model, and all technical solutions obtained by adopting equivalent replacement or equivalent transformation methods fall within the protection scope of the utility model.

Claims (5)

1. A simulation teaching device for continuous production of DOP, comprising chemical equipment, device frame and chemical instrument, chemical equipment is arranged on the device frame, chemical instrument is then connected with its corresponding chemical equipment, it is characterized in that, described chemical The equipment includes esterification reaction equipment, dealcoholization reaction equipment, neutralization water washing equipment, air stripping equipment and adsorption filtration equipment, among which, esterification reaction equipment, dealcoholization reaction equipment, neutralization water washing equipment, stripping equipment and adsorption filtration equipment are sequentially connected sequentially, while the frame of the installation is set as two layers above and below. 2. the simulation teaching device of continuous production DOP according to claim 1, is characterized in that, described esterification reaction equipment comprises the flow control device of reactor, heat exchanger and raw material, and wherein, reactor is 3 , are respectively the first reactor, the second reactor and the third reactor, and the three reactors are connected in sequence. 3. the simulation teaching device of continuous production DOP according to claim 2, is characterized in that, described first reactor is jacketed reactor, and the second reactor is inner coil type reactor, and the third The reaction kettle is an external half-cut tube reaction axe. 4. the simulation teaching device of continuous production DOP according to claim 2, is characterized in that, described heat exchanger is U-shaped tube heat exchanger, floating head heat exchanger, shell and tube heat exchanger, Any one of spiral plate heat exchanger and plate heat exchanger. 5. the simulation teaching device of continuous production DOP according to claim 1, is characterized in that, described chemical instrument comprises flowmeter, liquid level gauge and detection instrument, and described flowmeter is rotameter, quality Any one of flowmeters, electromagnetic flowmeters, orifice flowmeters, and ultrasonic flowmeters, the liquid level gauge is a beam-type liquid level gauge, and the detection instrument is a simulation or real instrument.

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