CN116999885A - A glycerol distillation and salt separation device and its application method - Google Patents

Abstract

The application relates to the technical field of glycerin distillation and discloses a glycerin distillation fraction salt device and an application method thereof, wherein the device comprises a salt separating component and a salt storage component, the salt separating component comprises a tank body and a feeding piece positioned in the tank body, a sedimentation channel is arranged at the bottom of the tank body, and the sedimentation channel is communicated with the top of the salt storage component; the device reduces the influence of fluid disturbance on the precipitation and salt separation of the crude glycerin containing salt through the salt separation component, the salt storage component and the sedimentation channel communicated with the salt separation component, and obviously improves the salt separation efficiency; meanwhile, the tank body is divided into a feeding area and a non-feeding area by arranging the baffle piece, the feeding area limits fluid disturbance in the feeding area, and the non-feeding area is not influenced by the fluid disturbance to carry out sedimentation and salt separation, so that the separation efficiency is remarkably improved; according to the method, the distillation efficiency of one-time distillation and the optimal glycerol yield are ensured by controlling the proportion of the reflux glycerol, so that the yield of high-whiteness recovered salt can be remarkably increased, the yields of inferior salt and residues are remarkably reduced, and the yield of refined glycerol is remarkably improved.

Description

A glycerol distillation and salt separation device and its application method

Technical field

The present invention relates to the technical field of glycerin distillation, and in particular to a glycerin distillation and salt separation device and its application method.

Background technique

The raw material used in glycerin distillation is crude glycerin, the main component of which is glycerol, with a content of 80% and above. The remaining components are impurities such as salt, water, fat, aldehydes, soaps and pigments. The salt content is above 3%, so it is necessary to Refined glycerol can be obtained by refining and purifying crude glycerol. The traditional industrial method for refining crude glycerol is glycerol distillation and refining, but there are the following problems in this process: as the glycerin continues to evaporate, the salt in the crude glycerol will precipitate and deposit at the bottom of the first distillation tower. Crude glycerin, salt and impurities are all sent to the second distillation tower without being separated and then evaporated. Because the residue contains a lot of salt and carries a lot of glycerol, the glycerol yield is significantly reduced. At the same time, the salt particles cause great wear and tear on the conveying equipment and seals, causing equipment Reduced durability.

Therefore, in order to solve the above problems, the prior art discloses a method for secondary distillation of glycerol. This method is used to improve the yield of glycerin by transferring the salt-containing crude glycerol produced after primary distillation to a secondary distillation tank for secondary distillation. efficiency, but the impurity residue after secondary distillation still contains more glycerol, and the residue is difficult to utilize, and the by-product treatment is difficult. In order to further improve the yield of glycerin distillation, a method of distillation and desalination has been disclosed in the prior art. For example, patent number CN205055535U discloses an alternating desalination device for glycerol distillation to precipitate salt. A filtering device is installed between the tower and the second distillation tower. The filtering device is used to filter and separate the salt and impurities in the salted glycerin after the primary distillation and then transfer it to the secondary distillation tower. However, this type of device has defects during use. , since salt and impurities easily adhere to the filter device, long-term use will cause the filter device to become clogged, causing problems such as high difficulty in cleaning and low practicality. In addition, in the prior art "Improvement of Glycerin Distillation and Salt Removal Process", a storage tank and a centrifuge are installed between the first distillation tower and the second distillation tower, and the salt-containing crude glycerin produced is pre-stored and then left to stand for separation. The salt in the salt-containing crude glycerin is then separated by centrifugal separation. However, the above method has low operation continuity and low production efficiency. Moreover, centrifuge separation has the problems of high separation cost and small separation volume.

At present, the method of salt-containing glycerol is mainly used for salt separation and then secondary distillation in the existing technology. The separation devices mainly include filtration devices, static separation devices and centrifugal separation devices. Due to the limited separation capacity of centrifugal devices, industrial production mainly Select the filtering device and the static separation device. When the application actually used the static separation device, it was found that if the salted glycerol is directly injected into the salt separation tank, the injected salted glycerin will produce great fluid disturbance, and the fluid disturbance will cause the already The stratified glycerol and salt are remixed, and the disturbance process significantly affects the standing effect and reduces the efficiency of standing separation.

Contents of the invention

In order to overcome the problem in the prior art of the glycerol distillation and salt separation device that the fluid disturbance generated after the salt-containing glycerol is injected into the salt separation tank significantly reduces the sedimentation and salt separation efficiency, the present application provides a glycerin distillation and salt separation device and its application method. In the device, a settling channel is set up between the salt separation component and the salt storage component so that the salt in the salted glycerol is not affected by fluid disturbance during the settling process, which significantly increases the separation speed of the salted crude glycerin and improves the salt separation efficiency.

The specific technical solutions of the present invention are:

A glycerin distillation and salt separation device includes a salt separation component and a salt storage component. The salt separation component includes a tank body and a feeding member located in the tank body. The bottom of the tank body is provided with a sedimentation channel, and the sedimentation channel is connected to the tank body. The top of the salt storage component is connected.

This application provides a glycerol distillation and salt separation device, which reduces the impact of fluid disturbance on the salt separation of salt-containing crude glycerol by arranging a sedimentation channel between the salt separation component and the salt storage component, thereby significantly improving the salt separation efficiency; The application found that the conventional static salt separation device is usually a device that integrates the salt separation component and the salt storage component. After injecting the salty crude glycerin, it is then left to stand and separate to separate the salt and crude glycerin. However, during the injection process, the salty glycerin is There will be fluid disturbance in the system. At this time, the salty crude glycerin that has been injected cannot be sedimented and stratified. The stratification operation can only be carried out after stopping the injection of salty glycerin. It takes a long time and the salt separation efficiency is low, so it cannot be realized. Continuous production has low production efficiency. Therefore, in response to the above problems, this application separates the salt separation component and the salt storage component through the sedimentation channel, so that the salt-containing crude glycerol can enter the sedimentation channel and enter the salt storage component for sedimentation separation, so that this part of the crude glycerol can be separated Affected by fluid disturbance, salt can be separated while injecting salted glycerol. At the same time, after the salted glycerin in the salt storage component is stratified, the glycerin will float back to the settling tank during the stratification process, and the salt will The separation of salt and glycerin is achieved by settling in the salt storage component. When injecting salt-containing glycerin, the salt and glycerin can be stratified and settled simultaneously. The separation efficiency is significantly improved and the continuity of glycerin production is ensured.

Preferably, the tank is provided with a stopper, one end of the stopper is connected to the top of the tank and hangs in the tank, and the stopper divides the tank into a feeding area and a non-feeding area.

Preferably, the cross-sectional area ratio of the feed area and the non-feed area is 1:3-4.

Preferably, the bottom of the stopper does not exceed the plane formed by the upper edge of the bottom of the tank.

It was found in this application that the fluid disturbance generated during feeding will greatly affect the process of sedimentation and salt separation, resulting in the failure of sedimentation and salt separation. It is usually necessary to wait for separation after the feeding is completed, but the separation time of the above process is long. , the separation is discontinuous and the separation efficiency is low. Therefore, this application solves the above problems by setting a stopper in the tank. When the salty glycerin enters the salt separation device, it will gradually accumulate in the salt separation component. When the liquid level of the salty glycerol After contact with the bottom of the stopper, as the salty glycerin continues to accumulate, the stopper will divide the accumulated salty glycerin into a feeding area and a non-feeding area. At this time, the disturbance generated by the fluid will be limited to the feeding area. In the feeding area, there will be no disturbance in the non-feeding area. At the same time, since the feeding area and the non-feeding area are connected, the glycerol entering will enter the non-feeding area for sedimentation and salt separation. By setting the barrier This component can significantly reduce the impact of fluid disturbance on glycerol sedimentation and salt separation. While feeding in the feeding area, the non-feeding area can simultaneously perform sedimentation and separation. The separation time is significantly reduced and the separation efficiency is significantly improved. The bottom of the stopper in this application does not exceed the upper edge of the bottom of the tank. The length of the stopper will affect the rate of fluid sedimentation and salt separation. A shorter stopper length will cause the volume of the non-feeding area to be reduced, affecting the non-feeding area. The efficiency of sedimentation salt separation in the feed area. When the length of the stopper is too large, it will lead to poor fluidity of the fluid and affect the salt separation efficiency. In addition, the cross-sectional area of the feed area and the non-feed area in this application is very important for sedimentation salt separation. The efficiency is also greatly affected. When the ratio of the cross-sectional area of the feed area and the non-feed area exceeds the range limited by this application, the volume of the feed area will be too large, resulting in salt content in the non-feed area that is not disturbed by the fluid. The volume of glycerin decreases and the salt separation efficiency is reduced. When the ratio of the cross-sectional area of the feed area and the non-feed area is lower than the range defined in this application, clogging in the feed area will easily occur.

Preferably, the bottom of the tank is funnel-shaped;

The bottom of the tank in this application is set in a funnel shape. Its function is that after the salt settles to the bottom of the tank, it will quickly enter the sedimentation channel along the slope of the funnel under the action of gravity, and the separation effect is high.

Preferably, the aspect ratio of the can body is 2 to 3:1.

An application method of a glycerin distillation and salt separation device, including the following steps: inject salty crude glycerol into a feed piece, and the salty glycerin enters the tank through the outlet of the feed piece and undergoes sedimentation and salt separation treatment to obtain salt and salt-separated glycerin, Salt-separated glycerol is divided into reflux glycerol and divaporized glycerol, and the salt enters the separation device for separation and purification;

Preferably, the flow rate of the salt-containing glycerin injected into the feed member is ≥1.4m/s.

Preferably, the sedimentation salt separation treatment includes a first state and a second state;

The first state includes: the salt storage component is not full, the salt-containing glycerin enters the sedimentation channel through the bottom of the tank and finally enters the salt storage component, the salt-containing glycerin settles and stratifies in the salt storage component, and the salt settles to the bottom of the salt storage component;

The second state includes: the salt storage component is full, the salt-containing glycerin accumulates in the salt-distributing component, the salt settles at the bottom of the tank and enters the settling channel, and finally settles in the salt storage component, and the salt-containing glycerol accumulates in the tank.

Preferably, the volume ratio of the refluxing glycerol and the salt-separated glycerol is 0.8-0.95:1.

This application also provides an application method of the above-mentioned glycerin salt separation device. In this method, salt-containing glycerol is injected into the glycerin salt separation device and then subjected to sedimentation and salt separation treatment. Due to the particularity of the structure of the glycerol salt separation device, the sedimentation and salt separation process is mainly divided into It is the first state and the second state. In the first state, the salt storage component is not full. At this time, the salt-containing glycerol will enter the salt storage component through the sedimentation channel after entering the salt separation device. The salt content in the salt storage component Salted glycerin will preferentially collect salted glycerin. When the salt storage component is filled, salted glycerin begins to accumulate in the salt distribution component. At the same time, the salted glycerin in the salt storage component will not be affected by fluid disturbance and will The sedimentation separation process is quickly carried out in the salt storage component. The salt is deposited in the salt storage component, and the salt-separating glycerol floats to the salt-separating component. While the salt storage component is undergoing sedimentation and separation, the second state is turned on. At this time, the salt content Glycerin accumulates in the salt separation component. When the liquid level of salt-containing glycerin comes into contact with the bottom end of the stopper, the salt-containing glycerin will gradually form a feeding area and a non-feeding area in the salt distribution tank. At this time, the feeding area The zone will limit the disturbance caused by salted glycerin to the inside of the feeding zone. At the same time, the bottom of the feeding zone and the non-feeding zone are connected. The liquid salted glycerol will evenly fill the feeding zone and the non-feeding zone. In the non-feeding area, the salt-containing glycerol in the non-feeding area will not be affected by fluid disturbance. It will rapidly settle and separate salts while feeding. The settled salt will enter the settling channel and finally settle in the salt storage component. The salt-separated glycerol is finally stored in the salt-separated component.

In addition, the separated glycerol separated by the glycerol salt separation device in this application still contains about 5% of dissolved salts that need to be further processed. In this application, the separated glycerol is divided into reflux glycerol and divaporized glycerol for further processing. The refluxed glycerin is returned to the first distillation tower for distillation with the newly added crude glycerin to produce refined glycerin, while the didistilled glycerin enters the second distillation tower for distillation to produce yellow glycerin. Through the above method, the yield of refined glycerin can be significantly improved. efficiency, while maximizing the removal of salt in salt-containing glycerin, and the salt separated by the glycerol salt separation device in this application has higher whiteness, fewer impurities, and significantly better quality than the salt obtained in the second distillation tower.

In addition, this application also limits the ratio of reflux glycerol and salt-separated glycerol. By limiting the above ratio, it is possible to achieve high whiteness and high quality through the glycerol salt-separated device while ensuring a significant increase in the yield of refined glycerin. of salt, reducing the yield of inferior salt and residue. For the above effect, first of all, due to the different distillation temperature and vacuum degree of the first distillation tower and the second distillation, the distillation temperature of the first distillation tower is 160-170°C, and the vacuum degree is < 3mmHg, the distillation temperature of the second distillation tower is 180-190°C, and the vacuum degree is <6mmHg. The first distillation tower produces refined glycerin, and the second distillation tower uses the salted glycerol distilled in the first distillation tower as raw material. Distillation separation is carried out. Since the higher distillation temperature of the second distillation tower will generate polymerized glycerin, the second distillation tower obtains yellow glycerol, inferior salt and residue. Usually, in order to obtain the maximum yield of refined glycerol, the amount of yellow glycerol is reduced. Yield, we will choose to reflux all the separated glycerol to the first distillation tower, but in actual operation, we found that returning all the separated glycerin to the first distillation tower as reflux glycerin will gradually reduce the yield of refined glycerin, and The long-term stability of production cannot be maintained. Since glycerol stays at high temperature in the distillation tower for a long time, the proportion of polymerized glycerin in the distillation system will gradually increase. When the proportion of polymerized glycerol is too high, the efficiency of distillation will decrease, resulting in a decrease in the yield of refined glycerin. , therefore, this application ensures the yield of refined glycerin by limiting the proportion of refluxing glycerol.

Compared with the existing technology, this application has the following technical effects:

1. This application uses the salt separation component, the salt storage component and the sedimentation channel connecting the two to reduce the impact of fluid disturbance on the sedimentation and salt separation of salt-containing crude glycerol, and significantly improve the salt separation efficiency;

2. In this application, the tank is divided into a feeding area and a non-feeding area by setting up stoppers. The feeding area limits fluid disturbance to the feeding area, and the non-feeding area is not affected by fluid disturbance for sedimentation and salt separation. Significantly improve separation efficiency;

3. This application also provides an application method for a glycerol distillation and salt separation device. In this application method, the distillation efficiency of primary distillation and the best glycerin yield are ensured by controlling the proportion of refluxing glycerin. This method can significantly increase the recovery of salt with high whiteness. The output can significantly reduce the output of inferior salt and residue, and significantly increase the yield of refined glycerin.

Description of the drawings

Figure 1 is a cross-sectional view of the salt distribution device of the present invention.

In the figure, there is a salt distribution component 1, a tank 101, a feeding component 102, a blocking component 103, a salt storage component 2 and a settling channel 3.

Detailed ways

The present invention will be further described below in conjunction with examples.

Example 1:

As shown in Figure 1, a glycerol distillation and salt separation device includes a salt separation component 1 and a salt storage component 2. The salt separation component includes a tank 101 and a feed member 102 located in the tank. The bottom of the tank is provided with a settling channel. 3. The sedimentation channel is connected to the top of the salt storage component. The length-to-diameter ratio of the tank is 2.5:1. The tank is also equipped with vacuum holes, manholes, observation mirror holes, pressure detection holes, temperature detection holes and discharge holes. There is a stopper 103 in the tank. One end of the stopper is connected to the top of the tank and hangs in the tank. The bottom of the stopper does not exceed the plane formed by the upper edge of the bottom of the tank. The stopper separates the tank. It is the feeding area and the non-feeding area. The feeding part is located in the feeding area. The cross-sectional area ratio of the feeding area and the non-feeding area is 1:4; the bottom of the tank is funnel-shaped, and the round side wall of the funnel is The angle is 90°, and the bottom of the tank is provided with a settling channel 3, which is connected to the salt storage component; the salt storage component is a salt storage tank, and the bottom of the salt storage tank is provided with a discharge port, which is connected to the filter press device.

Example 2:

An application method of a glycerol distillation and salt separation device. The method uses the glycerol distillation and salt separation device in Example 1. The method includes the following steps:

Pump the salted crude glycerol into the feed piece, and the salted glycerin enters the tank through the outlet of the feed piece and undergoes sedimentation and salt separation treatment to obtain salt and salt-separated glycerin. The salt-separated glycerol is divided into reflux glycerol and divaporized glycerol. The salt enters For separation and purification in the separation device, the flow rate of salted glycerin injected into the feed part is 3m/s;

The sedimentation and salt separation treatment includes the first state and the second state;

The first state includes: the salt storage component is not full, the salt-containing glycerin enters the sedimentation channel through the bottom of the tank and finally enters the salt storage component, the salt-containing glycerin settles and stratifies in the salt storage component, and the salt settles to the bottom of the salt storage component;

The second state includes: the salt storage component is full, salt-containing glycerin accumulates in the salt-separating component, the salt settles at the bottom of the tank and enters the settling channel and finally settles in the salt storage component, and the salt-separating glycerin accumulates in the tank;

The volume ratio of reflux glycerol and salt-separated glycerol is 0.95:1.

Example 3:

An application method of a glycerol distillation and salt separation device. The method uses the glycerol distillation and salt separation device in Example 1. The method includes the following steps:

Pump the salted crude glycerol into the feed piece, and the salted glycerin enters the tank through the outlet of the feed piece and undergoes sedimentation and salt separation treatment to obtain salt and salt-separated glycerin. The salt-separated glycerol is divided into reflux glycerol and divaporized glycerol. The salt enters During separation and purification in the separation device, the flow rate of salted glycerin injected into the feed part is 2.14m/s;

The sedimentation and salt separation treatment includes the first state and the second state;

The first state includes: the salt storage component is not full, the salt-containing glycerin enters the sedimentation channel through the bottom of the tank and finally enters the salt storage component, the salt-containing glycerin settles and stratifies in the salt storage component, and the salt settles to the bottom of the salt storage component;

The second state includes: the salt storage component is full, salt-containing glycerin accumulates in the salt-separating component, the salt settles at the bottom of the tank and enters the settling channel and finally settles in the salt storage component, and the salt-separating glycerin accumulates in the tank;

The volume ratio of reflux glycerol and salt-separated glycerol is 0.85:1.

Example 4:

An application method of a glycerol distillation and salt separation device. The method uses the glycerol distillation and salt separation device in Example 1. The method includes the following steps:

Pump the salted crude glycerol into the feed piece, and the salted glycerin enters the tank through the outlet of the feed piece and undergoes sedimentation and salt separation treatment to obtain salt and salt-separated glycerin. The salt-separated glycerol is divided into reflux glycerol and divaporized glycerol. The salt enters During separation and purification in the separation device, the flow rate of salted glycerin injected into the feed part is 1.41m/s;

The sedimentation and salt separation treatment includes the first state and the second state;

The first state includes: the salt storage component is not full, the salt-containing glycerin enters the sedimentation channel through the bottom of the tank and finally enters the salt storage component, the salt-containing glycerin settles and stratifies in the salt storage component, and the salt settles to the bottom of the salt storage component;

The second state includes: the salt storage component is full, salt-containing glycerin accumulates in the salt-separating component, the salt settles at the bottom of the tank and enters the settling channel and finally settles in the salt storage component, and the salt-separating glycerin accumulates in the tank;

The volume ratio of reflux glycerol and salt-separated glycerol is 0.8:1.

Comparative Example 1: (Integrated static salt distribution tank)

Comparative Example 1 is compared with Example 2. Comparative Example 1 is a conventional integrated static salt distribution tank, and the other conditions are the same as Example 2.

Comparative Example 2: (No stopper is set)

Compared with Example 2, the difference between Comparative Example 2 and Example 2 is that there is no stopper in the tank of the salt separation assembly, and the other conditions are the same as Example 2.

Comparative Example 3: (The flow rate injected into the feed piece is too small)

Compared with Example 2, the difference between Comparative Example 3 and Example 2 is that the flow rate of salt-containing glycerin injected into the feed member is 1.13m/s, and the other conditions are the same as Example 2.

Comparative Example 4: (The ratio of reflux glycerol and salt-separated glycerol is 1:1)

Compared with Example 2, the difference between Comparative Example 4 and Example 2 is that all partially salted glycerol is refluxed as reflux glycerol, and the other conditions are the same as Example 2.

Comparative Example 5: (The proportion of refluxing glycerol is too small)

Compared with Example 2, the difference between Comparative Example 5 and Example 2 is that the ratio of reflux glycerol and salt-separated glycerol is 0.7:1, and the other conditions are the same as Example 2.

Comparative Example 6: (No salt distribution device is installed)

Compared with Example 2, the difference between Comparative Example 6 and Example 2 is that there is no salt separation device, that is, no sedimentation salt separation treatment is performed. The other conditions are the same as Example 2.

Comparative Example 7: (The ratio of the cross-sectional area of the feed area to the non-feed area is too large)

Compared with Example 2, the difference between Comparative Example 7 and Example 2 is that the cross-sectional area ratio of the feed area and the non-feed area is 1:1, and the other conditions are the same as Example 2.

Comparative Example 8: (The ratio of the cross-sectional area of the feed area to the non-feed area is too small)

Compared with Example 2, the difference between Comparative Example 8 and Example 2 is that the cross-sectional area ratio of the feed area and the non-feed area is 1:6, and the other conditions are the same as Example 2.

Detection example

The salt separation efficiency of the glycerol distillation salt separation device in Examples 2 to 4 and Comparative Examples 1 to 3 and 7 to 8 was tested. The test results are shown in Table 1. The calculation formula for the salt separation efficiency is: (1-reflux glycerin Salt content/feed glycerol salt content)╳100%;

Table 1 Salt separation efficiency of glycerol distillation and salt separation device

Time required to separate salt from glycerin per ton of salt (h) Salt separation efficiency (%) Example 2 0.76 87.49 Example 3 0.88 86.10 Example 4 1.14 81.93 Comparative example 1 >12 86.10 Comparative example 2 0.76 16.60 Comparative example 3 1.43 77.76 Comparative example 7 0.76 79.15 Comparative example 8 0.76 76.37

As shown in Table 1, Examples 2 to 3 adopt the glycerol distillation and salt separation device provided by the present application. The shortest time required for the salt separation of glycerin per ton of salt in the present application can reach 0.76 hours, while the comparative example 1 contains glycerol per ton of salt. The time required for glycerol salt separation is more than 12 hours. Compared with Comparative Example 1, the salt separation time of this application is significantly reduced. The salt separation efficiency of this application can reach up to 87.49%. However, Comparative Example 2 does not have a blocker. During the same salt separation time, the salt separation efficiency is only 16.60%. Therefore, it can be seen from the above comparison that the salt separation efficiency of this application is 16.60%. After installation, the salt separation efficiency can be significantly improved. In addition, in Comparative Example 3, when the flow rate of salted glycerin injected into the feeding part is too small, the time required for salt separation per ton of salted glycerol in Comparative Example 3 is significantly increased, and the salt separation efficiency is also significantly reduced. It can be seen from Comparative Example 3 It should be noted that the flow rate of salted glycerol injected into the feed piece needs to be limited to the range set by this application. If it is too small, the efficiency of the salt separation time will be significantly reduced; in Comparative Examples 7 and 8, the feed area and The influence of sedimentation and salt separation treatment when the cross-sectional area ratio of the non-feeding area is set to exceed the limit of this application (1:3~4). In Comparative Example 7, when the cross-sectional area ratio of the feeding area and the non-feeding area is When it is too large, the time required for salt separation per ton of salty glycerol and the salt separation efficiency are significantly reduced. In Comparative Example 8, when the cross-sectional area ratio between the feed area and the non-feed area is too small, it will be found that there is a long Salt clogging is easy to occur after long-term use, and it needs frequent cleaning before it can be used again. The actual use effect is poor and the practicability is low.

Test statistics were conducted on the quality of the products produced in Examples 2 to 4 and Comparative Examples 1, 4 and 5. The test results are shown in Table 2.

Table 2 Products and yields of glycerin distillation and salt separation process

As shown in Table 2, Examples 2 to 4 adopt the method provided by this application. Comparative Example 1 is a conventional integrated salt separation device. Compared with Comparative Example 1, this application can increase the yield of refined glycerin by up to 3%. The whiteness of the salt obtained by secondary distillation is improved by up to 1%; in Comparative Example 2, no stopper is set, the glycerin yield of Comparative Example 2 and the whiteness of the salt obtained by secondary distillation are significantly reduced, and the residue obtained by secondary distillation is The rate is significantly increased, and the improvement can be up to 4%; in Comparative Example 3, when the flow rate of salted glycerin injected into the feeding part is too small, the glycerol yield in Comparative Example 3 is significantly reduced, and the secondary distillation residue yield is significantly increased, and the improvement can be Reaching 3%; in Comparative Example 4, after all the salt-separated glycerol was refluxed to the first distillation tower, it was found that this method could no longer be distilled after 5 days of distillation, and it needed to be shut down and cleaned before it could continue. The production efficiency was extremely low and could not be applied in In actual production; in Comparative Example 5, if the proportion of refluxed glycerin is too small, the yield of refined glycerin will be reduced; in addition, in Comparative Example 6, there is no salt separation device, that is, no sedimentation salt separation treatment is performed and it directly enters the secondary distillation. The yield of refined glycerin is only 83%, and the secondary distillation residue rate is the highest, reaching 10%.

The above are only preferred embodiments of the present invention and do not limit the present invention in any way. Any simple modifications, changes and equivalent transformations made to the above embodiments based on the technical essence of the present invention still belong to the technical solution of the present invention. scope of protection.

Claims (10)

1. A glycerin distillation and salt separation device, characterized by comprising a salt separation component (1) and a salt storage component (2). The salt separation component includes a tank (101) and a feeding member (102) located in the tank. ), the bottom of the tank is provided with a settling channel (3), and the settling channel is connected to the top of the salt storage component. 2. A glycerol distillation and salt separation device according to claim 1, characterized in that a stopper (103) is provided in the tank, and one end of the stopper is connected to the top of the tank and hangs in the tank. , the stopper divides the tank into a feeding area and a non-feeding area. 3. A glycerol distillation and salt separation device as claimed in claim 2, characterized in that the cross-sectional area ratio of the feed area and the non-feed area is 1:3~4. 4. A glycerol distillation and salt separation device according to claim 2, characterized in that the bottom of the stopper does not exceed the plane formed by the upper edge of the bottom of the tank. 5. A glycerin distillation and salt separation device according to claim 1, characterized in that the bottom of the tank is funnel-shaped. 6. A glycerol distillation and salt separation device as claimed in claim 1, characterized in that the length-to-diameter ratio of the tank is 2 to 3:1. 7. An application method of a glycerol distillation and salt separation device as claimed in any one of claims 1 to 6, characterized by comprising the following steps: injecting salty crude glycerin into the feeding part, and passing the salty glycerin through the feeding part. The outlet enters the tank for sedimentation and salt separation to obtain salt and salt-separated glycerol. The salt-separated glycerol is divided into reflux glycerol and divaporized glycerol, and the salt enters the separation device for separation and purification. 8. The application method according to claim 7, characterized in that the flow rate of the salt-containing glycerin injected into the feed member is ≥1.4m/s. 9. The application method according to claim 7, wherein the sedimentation salt separation treatment includes a first state and a second state; The first state includes: the salt storage component is not full, the salt-containing glycerin enters the sedimentation channel through the bottom of the tank and finally enters the salt storage component, the salt-containing glycerin settles and stratifies in the salt storage component, and the salt settles to the bottom of the salt storage component; The second state includes: the salt storage component is full, the salt-containing glycerin accumulates in the salt-distributing component, the salt settles at the bottom of the tank and enters the settling channel, and finally settles in the salt storage component, and the salt-containing glycerol accumulates in the tank. 10. The application method according to claim 7, characterized in that the volume ratio of the reflux glycerol and the salt-separated glycerol is 0.8~0.95:1.