Mother liquor recovery filter for thiazole esterification section

Abstract

The utility model relates to the technical field of mother liquor recovery and filtration, in particular to a thiazole esterification section mother liquor recovery filter which comprises a filter bin, the bottom of the filter bin is arranged to be an inverted cone-shaped part, a filter unit is arranged in an inner cavity of the filter bin, and the filter unit divides the inner cavity of the filter bin into an upper cavity and a lower cavity. The lower cavity is used for introducing mother liquor, the mother liquor in the upper cavity is supernatant filtered by the filter unit, an annular seat is fixedly mounted on the outer side wall of the middle of the filter bin, and lifting units are symmetrically mounted on the left side and the right side of the annular seat. The inverted-cone-shaped part at the bottom of the filtering bin enables impurities in mother liquor to be gathered towards the bottom outlet under the action of gravity, the bottom plugging cover facilitates concentrated deslagging, and manual cleaning is reduced; the inner cavity is divided into an upper cavity and a lower cavity by the filtering unit, solid impurities are left in the lower cavity after mother liquor is screened, and supernate enters the upper cavity to realize solid-liquid separation.

Description

Technical Field

[0001] This utility model relates to the field of mother liquor recovery and filtration technology, and in particular to a mother liquor recovery filter for a thiazolyl ester chemical section. Background Technology

[0002] The mother liquor from the thiazolidinyl ester chemical process contains unreacted intermediate products and other impurities. By filtering, these impurities are separated from the mother liquor, improving its purity and enabling its purification and recovery. This reduces resource waste, environmental pollution, and production costs.

[0003] Currently, the recovery of high-purity mother liquor from the thiazolidinyl ester chemical process mainly uses traditional screen filtration equipment. The mother liquor is continuously poured downwards from above the screen, filtering impurities through the screen mesh and collecting the high-purity mother liquor. Impurities are trapped at the top of the screen. However, this filtration and recovery equipment has the following drawbacks during the recovery process:

[0004] The method of filtering impurities by pouring the mother liquor from top to bottom causes the mother liquor to flow downwards. This method repeatedly impacts the impurities that were originally accumulated on the surface of the filter screen. As a result, each time the mother liquor falls down, it is easy for the smaller impurities remaining on the filter screen to be carried down with the mother liquor, resulting in poor filtration effect of the mother liquor.

[0005] After prolonged use, impurities accumulate on the surface of the filter screen, which significantly increases filtration resistance, reduces filtration efficiency, lengthens the mother liquor recovery and treatment cycle, and affects the continuity of the entire chemical production process.

[0006] Traditional filtration equipment requires complete disassembly to remove impurities, which is not only cumbersome and time-consuming, but also prone to damaging equipment components during disassembly.

[0007] Based on this, this utility model designs a new mother liquor recovery filter for thiazolium ester chemical section to solve the problems existing in the prior art, which has important practical significance and application value. Utility Model Content

[0008] To solve one of the aforementioned technical problems, the present invention provides a mother liquor recovery filter for a thiazolium ester chemical process, comprising a filter chamber, a ground base below the filter chamber, the bottom of the ground base being fixed to the ground, and the ground base being fixedly connected to the filter chamber by several vertical support legs. The bottom of the filter chamber is configured as an inverted cone shape, and a bottom sealing cap is installed at the bottom outlet of the inverted cone shape. A filter unit is provided inside the filter chamber, and the filter unit divides the inner cavity of the filter chamber into an upper cavity and a lower cavity. The lower cavity is used to introduce mother liquor, and the mother liquor in the upper cavity is the supernatant after being filtered by the filter unit. An annular seat is fixedly installed on the outer wall of the middle part of the filter chamber, and lifting units are symmetrically installed on the left and right sides of the annular seat. The two lifting units are in a synchronous lifting state during operation. A mother liquor inlet pipe is installed on the outer wall of the filter chamber at the upper part of the inverted cone shape, and the interior of the mother liquor inlet pipe is connected to the interior of the lower cavity.

[0009] Based on any of the above technical solutions, a further optimization is made as follows: the filter unit includes a movable and coaxially installed lifting short tube in the lower cavity, the top and bottom of the lifting short tube are both through, the outer side wall of the lifting short tube is movable and sealingly abuts against the inner cavity side wall of the filter chamber, a rigid filter screen is fixedly installed inside the lifting short tube, and control linkage components are symmetrically fixedly installed on the left and right sides of the top of the lifting short tube, the top of each control linkage component extends to the top of the filter chamber and is fixedly connected to the lifting unit on its corresponding side.

[0010] Based on any of the above technical solutions, a further optimization is made as follows: the control linkage component includes a horizontal connecting block fixed to the top of the lifting short tube, a vertically arranged connecting rod fixedly installed on the top of each horizontal connecting block, a horizontally arranged rotary motor provided on the outer side of the top of each connecting rod, the motor shaft of each rotary motor being fixedly connected to the outer side of the top of the connecting rod at its corresponding position, and the outer end of each rotary motor being fixedly connected to the top of the lifting unit on its corresponding side.

[0011] Based on any of the above technical solutions, a further optimization is made as follows: the lifting unit includes a lifting cylinder fixedly installed on the top of the annular seat, and the top of the piston rod of the lifting cylinder is fixedly connected to the outer end face of the rotary motor at the corresponding position.

[0012] Based on any of the above technical solutions, a further optimization is made: all the lifting cylinders are multi-stage telescopic cylinders, and each of the lifting cylinders is supplied with oil by an external hydraulic system.

[0013] Based on any of the above technical solutions, a further optimization is made as follows: a number of sealing rings are fixedly fitted at even intervals from top to bottom on the outer wall of the lifting short pipe, and the outer wall of each sealing ring abuts against the inner wall of the filter chamber.

[0014] Based on any of the above technical solutions, a further optimization is made as follows: the outer wall of the lifting short pipe is a smooth curved surface that has been polished and ground, and the inner wall of the filter chamber is a smooth curved surface that has been polished and ground.

[0015] Based on any of the above technical solutions, a further optimization is made: the bottom of the rigid filter screen contacts the top of the lower cavity, and the top of the rigid filter screen contacts the bottom of the upper cavity.

[0016] Based on any of the above technical solutions, a further optimization is made: when the piston rods of the two lifting cylinders are in a high position, the bottom of the lifting short pipe is located above the filter chamber and there is a gap between the two.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. The inverted conical part at the bottom of the filter chamber of this utility model causes impurities in the mother liquor to gather towards the bottom outlet under gravity, and the bottom sealing cover facilitates centralized slag discharge and reduces manual cleaning.

[0019] 2. The filter unit of this utility model divides the inner cavity into upper and lower chambers. After the mother liquor is filtered, solid impurities remain in the lower chamber, while the supernatant enters the upper chamber, thus achieving solid-liquid separation.

[0020] 3. The lifting units on both sides of the annular seat of this utility model lift and lower synchronously, driving the filter unit to move. The volume of the lower chamber can be adjusted to meet the needs of different batches of mother liquor processing.

[0021] 4. This utility model utilizes the liquid level difference formed by the injection of mother liquor as the filtration power, eliminating the need for additional pumping, reducing energy consumption, and lowering equipment operating costs. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn to scale.

[0023] Figure 1 This is a schematic diagram of the structure of this utility model.

[0024] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0025] Figure 3 This is a schematic diagram of a partial internal cross-sectional view of the present invention.

[0026] Figure 4 This is a schematic diagram of the filter unit of this utility model when it is in a high position.

[0027] Figure 5 This is a three-dimensional structural diagram of the filter unit of this utility model in the connected state with the lifting units on both sides.

[0028] Figure 6 for Figure 5 A schematic diagram of the main structure.

[0029] In the diagram, 1. Filter chamber; 101. Inverted conical part; 2. Ground base; 3. Vertical support leg; 4. Bottom sealing cover; 5. Upper chamber; 6. Lower chamber; 7. Annular seat; 8. Mother liquor inlet pipe; 9. Lifting short pipe; 10. Rigid filter screen; 11. Horizontal connecting block; 12. Connecting rod; 13. Rotary motor; 14. Lifting cylinder; 15. Sealing ring. Detailed Implementation

[0030] The embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of the present utility model, and are therefore merely examples and should not be construed as limiting the scope of protection of the present utility model. The specific structure of the present utility model is as follows: Figures 1-6 As shown in the image.

[0031] Example 1: A mother liquor recovery filter for a thiazolidinyl ester chemical process includes a filter chamber 1. A ground base 2 is provided below the filter chamber 1, and the bottom of the ground base 2 is fixed to the ground. The ground base 2 and the filter chamber 1 are fixedly connected by several vertical support legs 3. The bottom of the filter chamber 1 is set as an inverted cone-shaped part 101. A bottom sealing cover 4 is installed at the bottom outlet of the inverted cone-shaped part 101. A filter unit is provided inside the cavity of the filter chamber 1. The filter unit filters the contents of the filter chamber 1. The chamber is divided into an upper chamber 5 and a lower chamber 6. The lower chamber 6 is used to introduce the mother liquor. The mother liquor in the upper chamber 5 is the supernatant after being filtered by the filtration unit. An annular seat 7 is fixedly installed on the outer wall of the middle part of the filter chamber 1. Lifting units are symmetrically installed on the left and right sides of the annular seat 7. The two lifting units are in a synchronous lifting state when working. A mother liquor inlet pipe 8 is installed on the outer wall of the filter chamber 1 at the upper part of the inverted conical part 101. The interior of the mother liquor inlet pipe 8 is connected to the interior of the lower chamber 6.

[0032] The filter chamber 1 is fixed to the ground at its bottom via a base 2. Several vertical support legs 3 connect the base 2 and the filter chamber 1, forming a support structure to ensure the equipment's vertical stability. The inverted conical section 101 at the bottom of the filter chamber 1 gradually reduces the cross-sectional area of ​​the lower part of the chamber. The mother liquor inlet pipe 8 connects to the lower chamber 6. When the mother liquor flows into the lower chamber 6 from the inlet pipe, due to the structural characteristics of the inverted conical section 101, impurities accumulate towards the bottom outlet under gravity. The filter unit is installed in the inner cavity, dividing the chamber into an upper chamber 5 and a lower chamber 6. When the mother liquor level rises to the bottom of the filter unit, the liquid passes through the sieving action of the filter unit, solid impurities remain in the lower chamber 6, and the supernatant enters the upper chamber 5. The annular seat 7 is fixed to the outer wall of the middle part of the filter chamber 1. Its left and right lifting units are driven synchronously by a hydraulic system, thereby moving the filter unit up and down within the chamber.

[0033] During operation, the filter of this invention continuously injects the mother liquor of the thiazolium ester chemical section into the filter chamber 1 from the bottom through the mother liquor inlet pipe 8. As the mother liquor continuously enters the lower chamber 6 of the filter chamber 1, the liquid level of the mother liquor will continuously rise. When the liquid level of the mother liquor reaches the bottom of the filter unit, the mother liquor will continue to pass through the filter unit for filtration as the liquid level continues to rise, and the filtered supernatant will enter the upper chamber 5 above the filter unit, thereby achieving filtration.

[0034] Alternatively, the lifting unit can be controlled to continuously drive the filter unit to descend, thereby continuously filtering the supernatant above the filter unit. By using a pumped pipeline to continuously pump the supernatant inside the filtered upper chamber 5 to the outside for collection, the mother liquor can be cleaned and recycled, thus improving the purity of the mother liquor.

[0035] After the filter unit has been used for a certain period of time, it should be cleaned as needed. At this time, the mother liquor should be stopped from flowing in. By controlling the two lifting units to lift synchronously, the filter unit can be steadily raised to the top of the filter chamber 1. At this time, controlling the rotation or swing of the filter unit itself can clean the impurities accumulated at the bottom of the rigid filter screen 10 that was originally at the bottom as needed, thereby achieving rapid cleaning of the filter unit and reducing the difficulty of cleaning.

[0036] The inverted cone-shaped section 101 allows impurities to settle naturally to the bottom outlet, while the bottom sealing cap 4 facilitates centralized slag discharge, reducing the frequency of manual cleaning. The filter unit's partition chambers achieve spatial isolation between the mother liquor to be filtered and the supernatant, avoiding mixing and contamination.

[0037] In scenarios where the concentration of the mother liquor fluctuates significantly, the position of the filter unit within the cavity can be changed by adjusting the height of the lifting unit, thereby adjusting the volume of the lower cavity 6 to meet the processing requirements of different batches of mother liquor.

[0038] Based on any of the above technical solutions, a further optimization is made as follows: the filter unit includes a movable and coaxially mounted lifting short tube 9 in the lower cavity 6, the top and bottom of the lifting short tube 9 are both through, the outer side wall of the lifting short tube 9 is movable and sealingly abuts against the inner cavity side wall of the filter chamber 1, a rigid filter screen 10 is fixedly installed inside the lifting short tube 9, and control linkage components are symmetrically fixedly installed on the left and right sides of the top of the lifting short tube 9, the top of each control linkage component extends to the top of the filter chamber 1 and is fixedly connected to the lifting unit on its corresponding side.

[0039] The filtration unit consists of a lifting short pipe 9 and a rigid filter screen 10. The lifting short pipe 9 is coaxially installed in the lower cavity 6, with its top and bottom connected to form a liquid flow channel. The outer wall of the lifting short pipe 9 and the inner wall of the filter chamber 1 are sealed by a sealing ring 15 to ensure no liquid leakage during lifting.

[0040] The rigid filter screen 10 is fixed inside the lifting short tube 9, dividing the inner cavity of the lifting short tube 9 into upper and lower regions (corresponding to the upper cavity 5 and lower cavity 6 of the filter chamber 1).

[0041] A rigid filter screen 10 is fixed inside the lifting short pipe 9 by welding or bolting, forming a horizontal dividing surface that divides the inner cavity of the lifting short pipe 9 into two independent areas. The lower area is connected to the lower cavity 6 of the filter chamber 1 and is used to contain the mother liquor from the thiazole ester chemical process to be filtered; the upper area is connected to the upper cavity 5 of the filter chamber 1 and is used to store the supernatant after filtration. When the mother liquor enters the lower area from the lower cavity 6 of the filter chamber 1 through the bottom of the lifting short pipe 9, the liquid passes through the filter screen holes into the upper area under the pressure of the liquid level difference, while solid impurities are trapped in the lower area, thus achieving solid-liquid separation. Because the lifting short pipe 9 is coaxially and movably connected to the inner cavity of the filter chamber 1, the dividing effect of the filter screen is adjusted synchronously with the movement of the lifting short pipe 9, ensuring spatial isolation between the upper and lower areas during the filtration process.

[0042] The control linkage is symmetrically installed on the top of the lifting short tube 9, and its top extends out of the filter chamber 1 and is fixedly connected to the lifting unit. When the lifting unit is activated, the control linkage drives the lifting short tube 9 to rise and fall coaxially, thereby adjusting the position of the filter unit in the inner cavity of the filter chamber 1.

[0043] Based on any of the above technical solutions, a further optimization is made as follows: the control linkage component includes a horizontal connecting block 11 fixed to the top of the lifting short tube 9, a vertically arranged connecting rod 12 fixedly installed on the top of each horizontal connecting block 11, a horizontally arranged rotary motor 13 provided on the outer side of the top of each connecting rod 12, the motor shaft of each rotary motor 13 being fixedly connected to the outer side of the top of the connecting rod 12 at its corresponding position, and the outer end of each rotary motor 13 being fixedly connected to the top of the lifting unit on its corresponding side.

[0044] The lifting action of the lifting unit is transmitted to the connecting rod 12 through the motor housing, which drives the entire control linkage and the lifting short tube 9 to move up and down. When it moves to the high position, the bottom of the lifting short tube 9 is separated from the top of the filter chamber 1 and moves up to a suitable height. At this time, when the rotary motor 13 is powered on, the motor shaft drives the connecting rod 12 to rotate, which in turn drives the lifting short tube 9 and the rigid filter screen 10 inside to rotate through the horizontal connecting block 11, thereby achieving the purpose of controlling the tilt angle of the rigid filter screen 10, which facilitates the quick cleaning of the bottom of the rigid filter screen 10.

[0045] Based on any of the above technical solutions, a further optimization is made: the lifting unit includes a lifting cylinder 14 fixedly installed on the top of the annular seat 7, and the top of the piston rod of the lifting cylinder 14 is fixedly connected to the outer end face of the rotary motor 13 at the corresponding position.

[0046] The lifting unit consists of a lifting cylinder 14. The bottom of the lifting cylinder 14 is fixed to the top of the annular seat 7, and the piston rod extends upward. Its top is fixedly connected to the outer end face of the rotary motor 13 (the motor housing of the control linkage component).

[0047] When the hydraulic system supplies oil to the lifting cylinder 14, the piston rod extends or retracts, driving the rotary motor 13 and the control linkage to move up and down, thereby driving the filter unit to rise and fall within the filter chamber 1. The two lifting cylinders 14 are designed with synchronized oil circuits to ensure that the piston rods move synchronously, maintaining the horizontal state of the filter unit.

[0048] Based on any of the above technical solutions, a further optimization is made: all the lifting cylinders 14 are multi-stage telescopic cylinders, and each of the lifting cylinders 14 is supplied with oil by an external hydraulic system.

[0049] Example 2: Compared with Example 1, this example also includes the following technical features:

[0050] Based on any of the above technical solutions, a further optimization is made as follows: a number of sealing rings 15 are fixedly sleeved on the outer wall of the lifting short pipe 9 at even intervals from top to bottom, and the outer wall of each sealing ring 15 abuts against the inner wall of the filter chamber 1.

[0051] Several sealing rings 15 are evenly fitted onto the outer wall of the lifting short pipe 9. The sealing rings 15 are made of elastic material, and their outer walls are in close contact with the inner wall of the filter chamber 1.

[0052] As the lifting short pipe 9 moves up and down, the sealing ring 15 slides synchronously with it, maintaining a sealed contact with the inner wall of the filter chamber 1 through elastic deformation. This prevents the mother liquor in the lower chamber 6 from directly entering the upper chamber 5 through the gap between the short pipe and the chamber wall, ensuring that all liquids are filtered through the rigid filter screen 10. The spaced arrangement of the sealing rings 15 forms a multi-layer sealing structure, so even if a single sealing ring 15 wears out, the other sealing rings 15 can still maintain a sealing effect.

[0053] Based on any of the above technical solutions, the following further optimization is made: the outer wall of the lifting short pipe 9 is a smooth curved surface that has been polished and ground, and the inner wall of the filter chamber 1 is a smooth curved surface that has been polished and ground.

[0054] When the lifting pipe 9 moves within the chamber, the smooth curved surface reduces frictional resistance, making the lifting action smoother. Simultaneously, the smooth surface is less prone to adhering impurities or residual mother liquor, reducing the wear rate of the sealing ring 15 caused by surface roughness and extending the service life of the seal. Furthermore, the smooth curved surface is easier to rinse with cleaning fluid during cleaning, reducing residual stains and meeting the hygiene requirements of chemical production.

[0055] Based on any of the above technical solutions, a further optimization is made as follows: the bottom of the rigid filter screen 10 contacts the top of the lower cavity 6, and the top of the rigid filter screen 10 contacts the bottom of the upper cavity 5.

[0056] The rigid filter screen 10 is precisely positioned to match the upper chamber 5 and lower chamber 6 of the filter compartment 1, with its bottom in close contact with the top of the lower chamber 6 and its top in close contact with the bottom of the upper chamber 5, forming a surface contact seal structure. This design ensures that the mother liquor can only enter the upper chamber 5 through the mesh of the filter screen, preventing liquid from bypassing the filter unit through the gap between the filter screen edge and the chamber wall, thus achieving better filtration efficiency. Simultaneously, the tight contact between the upper and lower end faces of the filter screen and the corresponding inner chambers provides additional mechanical support, preventing the filter screen from shifting or deforming under liquid pressure.

[0057] Based on any of the above technical solutions, a further optimization is made: when the piston rods of the two lifting cylinders 14 are in a high position, the bottom of the lifting short pipe 9 is located above the filter chamber 1 and there is a gap between the two.

[0058] When the piston rod of the lifting cylinder 14 is fully extended (at its highest position), the lifting short pipe 9 is raised above the filter chamber 1, forming a gap between its bottom and the top opening of the filter chamber 1. This gap provides operating space for cleaning, maintenance, or replacement of the filter unit, allowing personnel to directly access the rigid filter screen 10 at the bottom of the lifting short pipe 9 for impurity cleaning or screen inspection. Simultaneously, the gap prevents the filter unit from mechanically colliding with the filter chamber 1 when raised to its highest position, protecting equipment components; it also provides space for the filter unit to swing or tilt.

[0059] During operation, the mother liquor is continuously injected into the lower chamber 6 from the bottom of the filter chamber 1 through the mother liquor inlet pipe 8. As the injection volume increases, the liquid level in the lower chamber 6 gradually rises. When the liquid level reaches the bottom of the filter unit, the liquid begins to pass through the sieve structure of the filter unit; the continued rise in liquid level creates a pressure difference, propelling the mother liquor continuously through the filter unit. Solid impurities are trapped by the filter unit, while the liquid passes through the filter layer into the upper chamber 5, forming supernatant, thus achieving a continuous filtration process. In this process, the filtration power comes from the natural liquid level difference generated by the injection of mother liquor, eliminating the need for additional pumping power. Utilizing the liquid level difference generated by the injection of mother liquor as the filtration power reduces energy consumption and lowers equipment operating costs.

[0060] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model. For those skilled in the art, any alternative improvements or transformations made to the implementation of this utility model fall within the protection scope of this utility model.

[0061] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. A mother liquor recovery filter for thiazolium ester chemical processes, characterized in that: The device includes a filter chamber, with a ground base below it. The bottom of the ground base is fixed to the ground, and the ground base and the filter chamber are fixedly connected by several vertical support legs. The bottom of the filter chamber is shaped like an inverted cone, and a bottom sealing cap is installed at the bottom outlet of the inverted cone. A filter unit is installed inside the filter chamber, dividing the inner cavity of the filter chamber into an upper cavity and a lower cavity. The lower cavity is used to introduce mother liquor, and the mother liquor in the upper cavity is the supernatant after filtration by the filter unit. An annular seat is fixedly installed on the outer wall of the middle part of the filter chamber, and lifting units are symmetrically installed on the left and right sides of the annular seat. The two lifting units move synchronously during operation. A mother liquor inlet pipe is installed on the outer wall of the filter chamber at the upper part of the inverted cone, and the interior of the mother liquor inlet pipe is connected to the interior of the lower cavity.

2. The thiazolyl ester chemical section mother liquor recovery filter according to claim 1, characterized in that: The filter unit includes a movable and coaxially mounted lifting short tube in the lower cavity. The top and bottom of the lifting short tube are both through-holes. The outer side wall of the lifting short tube is movable and sealingly abuts against the inner side wall of the filter chamber. A rigid filter screen is fixedly installed inside the lifting short tube. Control linkage components are symmetrically fixedly installed on the left and right sides of the top of the lifting short tube. The top of each control linkage component extends above the filter chamber and is fixedly connected to the lifting unit on its corresponding side.

3. The thiazolyl ester chemical section mother liquor recovery filter according to claim 2, characterized in that: The control linkage includes a horizontal connecting block fixed to the top of the lifting short tube, a vertically arranged connecting rod fixedly installed on the top of each horizontal connecting block, a horizontally arranged rotary motor provided on the outer side of the top of each connecting rod, the motor shaft of each rotary motor being fixedly connected to the outer side of the top of the connecting rod at its corresponding position, and the outer end of each rotary motor being fixedly connected to the top of the lifting unit on its corresponding side.

4. A mother liquor recovery filter for thiazolium ester chemical processing section according to claim 3, characterized in that: The lifting unit includes a lifting cylinder fixedly installed on the top of the annular seat, and the top of the piston rod of the lifting cylinder is fixedly connected to the outer end face of the rotary motor at the corresponding position.

5. A mother liquor recovery filter for a thiazolyl ester chemical production section according to claim 4, characterized in that: The lifting cylinders are all multi-stage telescopic cylinders, and each lifting cylinder is supplied with oil by an external hydraulic system.

6. A mother liquor recovery filter for a thiazolyl ester chemical production section according to claim 5, characterized in that: Several sealing rings are fixedly fitted at even intervals from top to bottom on the outer side wall of the lifting short pipe, and the outer side wall of each sealing ring abuts against the inner side wall of the filter chamber.

7. A mother liquor recovery filter for a thiazolyl ester chemical production section according to claim 6, characterized in that: The outer wall of the lifting short pipe is a smooth curved surface that has been polished and ground, and the inner wall of the filter chamber is a smooth curved surface that has been polished and ground.

8. A mother liquor recovery filter for a thiazolyl ester chemical production section according to claim 7, characterized in that: The bottom of the rigid filter screen contacts the top of the lower cavity, and the top of the rigid filter screen contacts the bottom of the upper cavity.

9. A mother liquor recovery filter for a thiazolyl ester chemical production section according to claim 8, characterized in that: When the piston rods of the two lifting cylinders are in the high position, the bottom of the lifting short pipe is above the filter chamber and there is a gap between them.

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