A filtration and purification device and filtration method for preparing L-glufosinate

Abstract

The present invention discloses a filtration and purification device and a filtration method for preparing glufosinate-ammonium, which relates to the field of filtration and purification of glufosinate-ammonium. It includes a cylinder tube, with a liquid inlet tube and a liquid outlet tube respectively penetrating through both ends of the cylinder tube. The liquid outlet tube extends inwardly into the cylinder tube with an inner extension tube. The inner wall of the cylinder tube has an annular wall with a reduced diameter; a filter housing is arranged between the annular wall and the inner extension tube. A filter screen is arranged on the annular surface of the filter housing, so that a filtration gap is formed between the annular surface of the filter housing and the inner wall of the cylinder tube. The diameter of one end of the filter housing close to the annular wall is larger than the inner diameter of the annular wall, and the other end of the filter housing has a sleeve, and the sleeve is in sealed sliding connection with the inner extension tube. A spring is arranged between the filter housing and the cylinder tube, so that the end of the filter housing abuts against the annular wall; in the present invention, a glufosinate-ammonium reaction liquid is pressurized and conducted into the straight-through cylinder tube through a booster pump, and the reaction liquid is filtered and purified by the filter housing. The device can be directly arranged between adjacent production processes of glufosinate-ammonium, and rapid and safe filtration and purification work can be achieved without setting up an independent process.

Description

Technical Field

[0001] The present invention relates to the field of filtration and purification of glufosinate-ammonium, and particularly to a filtration and purification device and a filtration method for preparing glufosinate-ammonium. Background Art

[0002] Glufosinate-ammonium is used as an efficient herbicide. Glufosinate-ammonium is a glutamine synthetase inhibitor, which causes the accumulation of ammonium ions in plants, inhibits photosynthesis, and thus achieves the herbicidal effect. The preparation of glufosinate-ammonium has multiple reaction steps. After the raw material reaction is completed, the reaction solution needs to be filtered and purified before being introduced into the next processing step. The purpose of filtration and purification is to remove the unreacted raw materials and insoluble substances generated by the reaction in the reaction solution and improve the purity of the reaction substances.

[0003] The filtration and purification of the reaction substances of glufosinate-ammonium are generally achieved through independent filtration processes. This not only increases the process steps in terms of technology but also requires a large-capacity filtration device to ensure the single-treatment volume, making it difficult to achieve continuous filtration and purification between adjacent treatment steps. In addition, during the preparation of glufosinate-ammonium, the airtightness of the equipment needs to be ensured, and the use of independent filtration steps increases the potential safety hazard of leakage. Summary of the Invention

[0004] In order to make up for the deficiencies of the existing technology problems, the purpose of the present invention is to provide a filtration and purification device and a filtration method for preparing glufosinate-ammonium, which are used to solve the problems of increased complexity of the preparation process, low filtration and purification efficiency, and high potential safety hazards in the traditional independent filtration process during the preparation of glufosinate-ammonium.

[0005] In order to solve the existing technology problems, the technical solution of the present invention is as follows:

[0006] A filtration and purification device for preparing glufosinate-ammonium, including a barrel tube. Liquid inlet pipes and liquid outlet pipes are respectively and penetratingly arranged at both ends of the barrel tube. An inner extension tube extends penetratingly into the barrel tube from the liquid outlet pipe. The inner wall of the barrel tube has an annular wall with a reduced diameter;

[0007] A filter housing is arranged between the annular wall and the inner extension tube. A filter screen is arranged on the annular surface of the filter housing, so that a filtering gap is formed between the annular surface of the filter housing and the inner wall of the barrel tube. The diameter of one end of the filter housing close to the annular wall is larger than the inner diameter of the annular wall. The other end of the filter housing has a sleeve, and the sleeve is in sealed sliding connection with the inner extension tube. A spring is arranged between the filter housing and the barrel tube, so that the end of the filter housing abuts against the annular wall;

[0008] A booster pump is connected to the liquid inlet pipe and is used to transport liquid to enter the barrel tube from the liquid inlet pipe and discharge from the liquid outlet pipe.

[0009] Preferably, a fan blade is concentrically fixed at one end of the filter housing close to the annular wall.

[0010] Preferably, the blades of the fan blades are distributed at the edge of the fan blade, and a conical surface pointing to the liquid inlet pipe is provided in the middle of the fan blade.

[0011] Preferably, a spiral plate is provided on the inner wall of the tube in the filtering gap, and the plate surface of the spiral plate is inclined in the direction of the liquid outlet pipe.

[0012] Preferably, the diameter of the filter housing gradually decreases from the liquid inlet pipe to the liquid outlet pipe, and the inner contour of the spiral plate is parallel to the filter housing, so that when the filter housing moves towards the liquid outlet pipe, the gap between the filter housing and the spiral plate gradually decreases.

[0013] Preferably, one end of the tube where the liquid outlet pipe is located has an enlarged diameter to form an expansion housing. The expansion housing is connected to a first outer conduit, the liquid outlet pipe is connected to a second outer conduit, a cross pipe is communicated between the first outer conduit and the second outer conduit, a waste discharge pipe is connected to the middle of the cross pipe, a plunger is slidably fitted in the cross pipe, the plunger can seal and block the waste discharge pipe, and the plunger is connected with a spring for applying a pressure to the plunger in the direction of the first outer conduit.

[0014] Preferably, a stud is threaded through the end of the cross pipe, a stop block is connected to the inner end of the stud, and the spring applying pressure to the plunger is arranged between the plunger and the stop block.

[0015] Preferably, the end of the first outer conduit is sealed by a cock connected by a thread.

[0016] A method for filtering and purifying glufosinate-ammonium by using the filtering and purifying equipment for preparing glufosinate-ammonium as described above specifically comprises the following steps:

[0017] A. The input end of the booster pump is connected to the reaction process of preparing glufosinate-ammonium, and the liquid outlet pipe is connected to the next process of the glufosinate-ammonium reaction process. The elastic force makes the end face of the filter housing abut against the ring wall, so that the internal cavity of the tube is in a blocked state.

[0018] B. The reaction liquid of glufosinate-ammonium is pressurized and introduced into the tube by the booster pump. The filter housing moves towards the liquid outlet pipe under the action of the liquid pressure. The filter housing is separated from the ring wall, so that the internal cavity of the tube is communicated. The reaction liquid enters the inside of the filter housing through the filter screen on the ring surface of the filter housing and is then discharged through the liquid outlet pipe. The insoluble substances in the reaction liquid are retained outside the filter housing.

[0019] C. When the booster pump stops guiding the liquid, the filter housing is re-abutted against the ring wall under the action of the elastic force to block the internal cavity of the tube, so that the filtered insoluble substances are gathered on one side of the ring wall close to the liquid outlet pipe.

[0020] Compared with the prior art, the advantages of the present invention are as follows:

[0021] 1. The present invention pressurizes and conducts the glufosinate-ammonium reaction liquid into a straight-through tube through a booster pump, and filters and purifies the reaction liquid through a filter housing. The device can be directly arranged between adjacent production processes of glufosinate-ammonium, and rapid and safe filtration and purification work can be achieved without setting up an independent process.

[0022] 2. The present invention drives the fan blade through the liquid flow to drive the filter housing to rotate, so that the spiral plate can peel off the filter residues retained on the outer side of the filter housing and conduct the filter residues to the end for concentration, which can keep the filter housing highly permeable and is also convenient for centralized collection of the filter residues.

[0023] 3. The present invention makes the two ends of the plunger bear the pressure changes on the inner and outer sides of the filter housing. The pressure changes feedback the aggregation density of the filter residues. The pressure changes will cause the plunger to move, and the waste discharge pipe can be automatically opened to discharge the filter residues, realizing the automatic cleaning function. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 It is a schematic diagram of the structure of the filter housing opening the closed chamber of the present invention.

[0026] Figure 3 It is a schematic diagram of the structure of the filter housing opening the tube chamber of the present invention.

[0027] Figure 4 It is a schematic diagram of the internal structure of the tube of the present invention.

[0028] Figure 5 It is a schematic diagram of the connection structure of the first outer conduit, the second outer conduit and the cross tube of the present invention.

[0029] Reference numerals: 1, tube; 11, liquid inlet pipe; 12, liquid outlet pipe; 13, expansion housing; 14, annular wall; 15, inner extension pipe; 2, booster pump; 3, filter housing; 31, sleeve housing; 4, fan blade; 41, conical surface; 5, spiral plate; 6, first outer conduit; 61, cock; 7, second outer conduit; 8, cross tube; 81, waste discharge pipe; 82, plunger; 83, stop block; 84, stud. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0031] The filtration and purification equipment is directly connected between the liquid conveying pipelines of adjacent processes of glufosinate-ammonium, and directly filters and purifies the reaction liquid when conducting the reaction liquid to the next process, such as Figure 1 , Figure 4As shown, the filtration and purification device has a cylindrical tube 1 as the main body. The inlet pipe 11 and the outlet pipe 12 are respectively connected through the left and right ends of the tube 1. The inner extension pipe 15 is fixed at the right end inside the tube 1 and is aligned and communicated with the outlet pipe 12. There is a reduced-diameter annular wall 14 on the left side inside the tube 1;

[0032] As Figure 2 , Figure 3 shown, the filter housing 3 is cylindrical. The annular surface of the filter housing 3 is a filter screen. The right end face of the filter housing 3 has a sleeve 31 extending inward. The filter housing 3 is placed between the annular wall 14 and the inner extension pipe 15. The left end face diameter of the filter housing 3 is larger than the inner diameter of the annular wall 14. The sleeve 31 is slidably sleeved outside the inner extension pipe 15 and is slidably sealed with a sealing ring, so that the filter housing 3 can slide axially along the inner extension pipe 15. A spring is provided at the right end of the filter housing 3 to connect with the tube 1, applying a leftward pressure to the filter housing 3, making the left end face of the filter housing 3 contact the annular wall 14, blocking the internal cavity of the tube 1. A filtering gap is formed between the annular surface of the filter housing 3 and the inner wall of the tube 1;

[0033] The input end of the booster pump 2 is connected to the preparation reaction process of glufosinate-ammonium, and the output end of the booster pump 2 is connected to the inlet pipe 11;

[0034] In the preparation and processing of glufosinate-ammonium, when the reaction liquid of glufosinate-ammonium has fully reacted, the booster pump 2 is started to drive the reaction liquid to be conducted to the next process. During the conduction process, the reaction liquid first enters the tube 1 through the inlet pipe 11. The hydraulic pressure at the left end part inside the tube 1 gradually increases, and the expansion shell 13 is pushed to move to the right against the elastic force. The filter housing 3 is separated from the annular wall 14, enabling the reaction liquid to enter the filtering gap. The reaction liquid passes through the filter screen of the filter housing 3 and enters the filter housing 3, and then is introduced into the next process through the inner extension pipe 15 and the outlet pipe 12. The insoluble substances in the reaction liquid are retained outside the filter housing 3. In this way, the reaction liquid entering the next process can be continuously filtered and purified. When the filtering work is stopped, the elastic force makes the filter housing 3 move to the left and fit with the annular wall 14 again to block the internal cavity of the tube 1. The filtered substances are gathered on the right side of the annular wall 14, avoiding the backflow of the filtered substances and facilitating the centralized discharge of the filtered substances.

[0035] To prevent the outside of the filter housing 3 from being blocked by continuously accumulated insoluble substances during continuous filtering work, it is necessary to clean the surface of the filter housing 3. The operation is as follows:

[0036] As Figure 2 , Figure 3 shown, a fan blade 4 is concentrically fixed at one end of the filter housing 3 close to the annular wall 14. The blades of the fan blade 4 are distributed at the edge position of the fan blade 4. A spiral plate 5 is fixedly arranged on the inner wall of the tube 1 within the filtering gap;

[0037] When the booster pump 2 boosts the pressure and introduces the reaction liquid inward, the fan blade 4 is impacted by the reaction liquid and drives the filter housing 3 to rotate. The insoluble substances accumulated outside the filter housing 3 are peeled off by the spiral plate 5 and conducted to the right, which not only prevents the outside of the filter housing 3 from being blocked by excess substances, but also enables the filtered substances to accumulate to the right for convenient centralized cleaning;

[0038] The middle part of the fan blade 4 has a conical surface 41 pointing to the liquid inlet pipe 11. The conical surface 41 is used to disperse the reaction liquid around, so that the reaction liquid can fully drive the fan blade 4 to drive the filter housing 3 to rotate. The plate surface of the spiral plate 5 is inclined towards the direction of the liquid outlet pipe 12, which can effectively prevent the substances conducted to the right by the filter housing 3 from flowing back.

[0039] As Figure 2 、 Figure 3 shown, the diameter of the filter housing 3 gradually decreases from the direction of the liquid inlet pipe 11 to the liquid outlet pipe 12. The inner contour of the spiral plate 5 is parallel to the filter housing 3. When the filter housing 3 moves towards the liquid outlet pipe 12, the gap between the filter housing 3 and the spiral plate 5 gradually decreases, and the peeling strength of the spiral plate 5 on the filtered substances outside the filter housing 3 is gradually increased.

[0040] Since the filtered insoluble substances accumulate on the right side of the cylinder tube 1, when the substances accumulate to a certain extent, it will greatly affect the filtration and purification work. The filtration and purification equipment has the function of automatically cleaning the filter, and the specific operation is as follows:

[0041] As Figure 2 、 Figure 3 、 Figure 5 shown, the right end diameter of the cylinder tube 1 expands to form an expansion housing 13. The expansion housing 13 is connected and provided with a first outer conduit 6. The liquid outlet pipe 12 is connected to a second outer conduit 7. A transverse pipe 8 is connected and communicated between the first outer conduit 6 and the second outer conduit 7. A waste discharge pipe 81 is connected to the middle of the transverse pipe 8. A plunger 82 is slidably and adaptively arranged in the transverse pipe 8. The length of the plunger 82 is greater than the caliber of the waste discharge pipe 81, so that the plunger 82 can seal and block the waste discharge pipe 81. A spring is arranged on the right side of the plunger 82 and connected to the transverse pipe 8 to apply a pressure to the plunger 82 in the direction of the first outer conduit 6;

[0042] During the filtration process of the glufosinate-ammonium reaction liquid, the pressure outside the filter housing 3, as well as the pressure in the first outer conduit 6 and the expansion housing 13, are both P1, and the pressure inside the filter housing 3 and inside the liquid outlet pipe 12 is P2, and P1 > P2;

[0043] The pressure on the left side of the plunger 82 is P1, and the pressure on the right side of the plunger 82 is P2 plus the elastic force of the spring. During normal filtration operation, the plunger 82 is subjected to balanced forces on both sides, causing the plunger 82 to maintain the blockage of the waste discharge pipe 81. As the amount of filter material accumulating on the right side of the cartridge 1 increases, the overall filtration permeability of the filter housing 3 gradually decreases, P1 gradually increases, and P2 gradually decreases, causing the plunger 82 to gradually move to the right and compress the spring. When the difference between P1 and P2 reaches a certain level, the plunger 82 moves to open the waste discharge pipe 81, allowing the filter material on the right side of the cartridge 1 to follow the liquid and be discharged through the first outer conduit 6, the cross pipe 8, and the waste discharge pipe 81, reducing the density of the filter material and gradually increasing the permeability of the filter housing 3. The difference between P1 and P2 gradually returns to an appropriate range, and the plunger 82 gradually moves to the left to block the waste discharge pipe 81, maintaining the normal filtration mode.

[0044] As Figure 5 shown, a stud 84 passes through the end of the cross pipe 8 in a threaded manner, and a stopper 83 is connected to the inner end of the stud 84. The spring applying pressure to the plunger 82 is arranged between the plunger 82 and the stopper 83. By rotating the stud 84 to move the position of the stopper 83 against the spring, the pressure applied by the spring to the plunger 82 can be adjusted, and the plunger 82 can be adjusted to maintain an appropriate position within the cross pipe 8 according to the working conditions.

[0045] As Figure 5 shown, the end of the first outer conduit 6 is sealed by a cock 61 connected by a thread. By rotating the cock 61, the first outer conduit 6 can be opened to enable manual cleaning of the filter material.

[0046] The method for filtering and purifying glufosinate-ammonium using the above filtration and purification equipment is as follows:

[0047] A. The input end of the booster pump 2 is connected to the reaction process for preparing glufosinate-ammonium, and the liquid outlet pipe 12 is connected to the next process of the glufosinate-ammonium reaction process. The elastic force causes the end face of the filter housing 3 to abut against the annular wall 14, blocking the internal cavity of the cartridge 1.

[0048] B. The reaction liquid of glufosinate-ammonium is pressurized by the booster pump 2 and introduced into the cartridge 1. The filter housing 3 moves towards the liquid outlet pipe 12 under the action of the liquid pressure, and the filter housing 3 separates from the annular wall 14, causing the internal cavity of the cartridge 1 to be unblocked. The reaction liquid enters the interior of the filter housing 3 through the filter screen on the circumferential surface of the filter housing 3 and is then discharged through the liquid outlet pipe 12. The insoluble substances in the reaction liquid are retained outside the filter housing 3.

[0049] C. When the booster pump 2 stops guiding the liquid, the filter housing 3 is again abutted against the annular wall 14 under the action of the elastic force, blocking the internal cavity of the cartridge 1, causing the filtered insoluble substances to accumulate on one side of the annular wall 14 close to the liquid outlet pipe 12.

[0050] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A filtering and purification device for preparing refined glufosinate-ammonium, characterized in that: include: A tube (1), wherein a liquid inlet pipe (11) and a liquid outlet pipe (12) are respectively provided at both ends of the tube (1), wherein an inner tube (15) is provided on the liquid outlet pipe (12) and extends into the tube (1), and the inner wall of the tube (1) has an annular wall (14) with a reduced diameter; A filter housing (3), the filter housing (3) being arranged between the annular wall (14) and the inner tube (15), a filter screen being arranged on the annular surface of the filter housing (3) so that a filtering gap is formed between the annular surface of the filter housing (3) and the inner wall of the tube (1), the diameter of one end of the filter housing (3) close to the annular wall (14) being larger than the inner diameter of the annular wall (14), the other end of the filter housing (3) being provided with a sleeve (31), the sleeve (31) and the inner tube (15) being sealed and slidable, a spring being arranged between the filter housing (3) and the tube (1) so that the end of the filter housing (3) is in contact with the annular wall (14); A booster pump (2), the booster pump (2) being connected to the liquid inlet pipe (11) and used for conveying liquid into the bobbin (1) through the liquid inlet pipe (11) and out of the bobbin (1) through the liquid outlet pipe (12); The diameter of one end of the barrel (1) located at the liquid outlet pipe (12) is enlarged to form an expansion shell (13); the expansion shell (13) is connected to a first outer conduit (6); the liquid outlet pipe (12) is connected to a second outer conduit (7); a transverse pipe (8) is connected between the first outer conduit (6) and the second outer conduit (7); a waste discharge pipe (81) is connected to the middle of the transverse pipe (8); a plunger (82) is slidably adapted in the transverse pipe (8); the plunger (82) can seal and block the waste discharge pipe (81); the plunger (82) is connected to a spring for applying pressure to the plunger (82) in the direction of the first outer conduit (6); The inner wall of the barrel (1) is provided with a spiral plate (5) in the filtering gap, and the plate surface of the spiral plate (5) is inclined in the direction of the liquid outlet pipe (12); The diameter of the filter housing (3) gradually decreases in the direction from the liquid inlet pipe (11) to the liquid outlet pipe (12), and the inner circle profile of the spiral plate (5) remains parallel to the filter housing (3), so that when the filter housing (3) moves in the direction of the liquid outlet pipe (12), the gap between the filter housing (3) and the spiral plate (5) gradually decreases.

2. The filtering and purification equipment for preparing refined glufosinate-ammonium according to claim 1, characterized in that: A fan blade (4) is coaxially fixed to one end of the filter housing (3) close to the annular wall (14).

3. The filtering and purification equipment for preparing refined glufosinate-ammonium according to claim 2, characterized in that: The blades of the fan blade (4) are distributed at the edge of the fan blade (4), and the middle of the fan blade (4) has a conical surface (41) pointing towards the liquid inlet pipe (11).

4. The filtering and purification equipment for preparing refined glufosinate-ammonium according to claim 1, characterized in that: A stud (84) is threadedly penetrated at the end of the transverse tube (8), a stopper (83) is connected to the inner end of the stud (84), and a spring for applying pressure to the plunger (82) is arranged between the plunger (82) and the stopper (83).

5. The filtering and purification equipment for preparing refined glufosinate-ammonium according to claim 1, characterized in that: The end of the first outer conduit (6) is sealed by a threaded plug (61).

6. A method for preparing and filtering refined glufosinate ammonium using the filtering and purifying device for preparing refined glufosinate ammonium according to any one of claims 1 to 5, characterized in that: The specific steps are as follows: A. The input end of the booster pump (2) is connected to the reaction process of preparing refined glufosinate ammonium, and the liquid outlet pipe (12) is connected to the next process of the refined glufosinate ammonium reaction process. The elastic force causes the end surface of the filter housing (3) to collide with the annular wall (14), so that the internal chamber of the barrel (1) is in a blocked state; B. The reaction liquid of glufosinate ammonium is pressurized and introduced into the barrel (1) by a booster pump (2). The filter housing (3) moves toward the liquid outlet pipe (12) under the action of the liquid pressure. The filter housing (3) is separated from the annular wall (14) so ​​that the internal chamber of the barrel (1) is connected. The reaction liquid passes through the filter screen on the annular surface of the filter housing (3) and enters the interior of the filter housing (3) and is then discharged from the liquid outlet pipe (12). Insoluble substances in the reaction liquid are retained on the outside of the filter housing (3); C. When the booster pump (2) stops guiding the liquid, the filter housing (3) is elastically acted upon to contact the annular wall (14) again to block the inner chamber of the tube (1), so that the filtered insoluble matter is gathered on the side of the annular wall (14) close to the liquid outlet pipe (12).

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