Solvent recovery device in glyphosate aqueous solution production process

Abstract

The invention belongs to the technical field of glyphosate aqueous solution production, and particularly discloses a solvent recovery device in a glyphosate aqueous solution production process, which comprises a hydrolysis kettle, a methanol recoverer and a pipeline, a neutralization device is arranged between the hydrolysis kettle and the methanol recoverer, and the neutralization device comprises a protective sleeve, an end cover is arranged between the inner walls of the protective sleeve and close to the top edge; according to the invention, liquid caustic soda is injected into the storage inner container, then mixed gas such as methanol, methylal, chloromethane, water vapor and the like from the hydrolysis kettle is introduced into the neutralization device to be neutralized by the liquid caustic soda and then enters the methanol recoverer, methanol and methylal are separated out, a flow channel of the mixed gas is conducted through the butt joint assembly in the neutralization device, and the mixed gas is recycled. And during neutralization, the feedback control assembly is used for controlling on-off of conveying of the mixed gas, so that supply of the mixed gas can be cut off when the concentration of the liquid caustic soda is relatively low.

Description

Technical Field

[0001] This invention relates to the field of glyphosate aqueous solution production technology, and more particularly to a solvent recovery device in the production process of glyphosate aqueous solution. Background Technology

[0002] Glyphosate is a systemic, highly efficient, low-toxicity, broad-spectrum, non-selective herbicide. The production route of glyphosate adopts the "glycine-dimethyl phosphite" method, using triethylamine as a catalyst. Paraformaldehyde polymerizes in methanol to generate hemiacetal, which further reacts with glycine and then undergoes esterification with dimethyl phosphite. Subsequently, the synthesis solution is mixed with hydrochloric acid, acidified, desolventized, and deacidified to obtain glyphosate aqueous solution.

[0003] Currently, in the solvent removal process, the mixed gas containing methanol, methyl acetal, chloromethane, and water vapor from the hydrolysis reactor needs to be neutralized with liquid alkali before entering the methanol recovery system to separate methanol and methyl acetal. However, during the neutralization process, as the liquid alkali is consumed, the concentration of the liquid alkali decreases, which reduces the neutralization effect and affects the absorption of acidic substances inside the mixed gas. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a solvent recovery device in the production process of glyphosate aqueous solution.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a solvent recovery device in the production process of glyphosate aqueous solution, comprising a hydrolysis kettle, a methanol recovery unit and pipelines, a neutralization device being provided between the hydrolysis kettle and the methanol recovery unit, the neutralization device comprising a protective sleeve, an end cap being provided between the inner walls of the protective sleeve near the top edge, the top of the end cap being connected to the methanol recovery unit through a pipeline, and the bottom of the protective sleeve being connected to the hydrolysis kettle through a pipeline; The bottom surface of the protective sleeve is equipped with a feedback control component at the connection point of the pipeline. The inside of the protective sleeve is equipped with a storage liner, and the bottom of the storage liner is equipped with a docking component.

[0006] Preferably, a limiting ring is fixed between the inner walls of the protective sleeve, and an annular pad is slidably connected between the inner walls of the protective sleeve. The top of the annular pad is in contact with the bottom of the limiting ring, and a lifting spring is fixed to the bottom of the annular pad. The bottom of the lifting spring is fixed to the inner bottom surface of the protective sleeve. An outer ring opening is opened on the outer surface of the storage liner near the bottom edge. The inner wall of the outer ring opening is in contact with the inner wall of the limiting ring, and the bottom of the storage liner is in contact with the top of the annular pad.

[0007] Preferably, a conical guide ring is fixed in the middle between the inner walls of the storage liner, a sponge plug is provided between the inner walls of the conical guide ring, a nylon ring is provided near the top of the conical guide ring close to the inner wall of the storage liner, a filter cover is provided near the top edge between the inner walls of the storage liner, a lime drying sheet is provided on the inner bottom surface of the filter cover, the bottom edge of the filter cover is in contact with the top of the nylon ring, and a honeycomb plate is fixed below the conical guide ring between the inner walls of the storage liner.

[0008] Preferably, the docking assembly includes a pendant slider, a fixed post is provided at the middle of the bottom of the storage liner, an inner cavity is provided inside the fixed post, the bottom of the inner cavity extends to the bottom of the fixed post, a conical cavity is provided on the inner bottom surface of the storage liner above the fixed post, and the inner top surface of the conical cavity is cylindrical and extends to the inner bottom surface of the storage liner.

[0009] Preferably, the pendant slider is slidably disposed between the inner walls of the inner cavity, the bottom of the pendant slider is provided with a mating groove, the top pendant part of the pendant slider slides through into the interior of the conical cavity, and the interior of the pendant slider is provided with a transition cavity, the bottom of the transition cavity being connected to the mating groove.

[0010] Preferably, the inner top surface of the transition cavity is provided with multiple diversion holes at equal intervals along the circumferential direction, one end of each diversion hole extends to the outer surface of the pendant slider, a support ring is provided on the outer surface of the pendant slider below the pendant part, an annular groove is provided on the inner top surface of the inner cavity near the edge, and a first spring is fixed between the top of the pendant slider near the edge of the outer surface and the inner top surface of the annular groove.

[0011] Preferably, a rotating shaft is provided inside the cylindrical through-hole on the inner top surface of the conical cavity. A constraint sleeve is rotatably fitted on the outer surface of the rotating shaft. Multiple support rods are fixed on the outer surface of the constraint sleeve. One end of each support rod is fixed to the inner wall of the cylindrical through-hole on the inner top surface of the conical cavity. Multiple vortex blades are fixed at equal intervals along the circumferential direction on the outer surface of the rotating shaft near the bottom edge. The multiple vortex blades are located above the top of the conical cavity. The top of the rotating shaft extends into the interior of the storage liner. Multiple levers are fixed at equal intervals on the outer surface of the rotating shaft near the top edge.

[0012] Preferably, the feedback control component includes a bridge pipe, a fixing cover is installed at the middle of the inner bottom surface of the protective sleeve, the top of the fixing cover is connected to a connecting pipe, the top of the connecting pipe is engaged in the inside of the docking groove, the bottom of the fixing cover is connected to the pipe opening at the bottom of the protective sleeve, and a drop pipe is fixed between the inner walls of the pipe opening at the bottom of the protective sleeve, with the drop section of the drop pipe extending downward.

[0013] Preferably, the bridge connector is located inside the fixed cover, the top of the bridge connector slides to the top of the connecting pipe, and the outer surface of the bridge connector slides and seals against the inner wall of the connecting pipe. The bottom of the bridge connector extends to the bottom of the drop tube. The bottom of the bridge connector is closed and the top is open. Multiple grid openings are equidistantly provided along the circumferential direction on the outer surface of the bridge connector near the bottom edge. Multiple side openings are equidistantly provided along the circumferential direction on the outer surface of the drop tube near the bottom edge. The multiple side openings are all connected to the grid openings.

[0014] Preferably, a retaining ring is fixed between the inner walls of the fixed cover at the upper edge, and a sliding plate is slidably arranged between the inner walls of the fixed cover. The top of the sliding plate is in contact with the bottom of the retaining ring. A second spring is fixed between the top of the sliding plate and the inner top surface of the fixed cover. Contact rods are fixed near the two side edges of the top of the sliding plate, and the tops of the two contact rods extend through to the top of the fixed cover.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, liquid alkali is first injected into the storage tank. Then, a mixture of methanol, methylal, chloromethane, water vapor, etc., from the hydrolysis reactor is introduced into the neutralization device and neutralized by the liquid alkali. Then, it enters the methanol recovery unit to separate methanol and methylal. In the neutralization device, the flow channel of the mixed gas is opened by the docking component so that it can come into contact with the liquid alkali for neutralization. During neutralization, the supply of the mixed gas is controlled by the feedback control component so that the supply of the mixed gas can be cut off when the concentration of liquid alkali is low. 2. When the neutralization device of the present invention is working, the storage liner after storing liquid alkali needs to be installed into the inside of the protective sleeve. When the storage liner is not installed into the inside of the protective sleeve, the feedback control component inside the protective sleeve is in the closed state. At this time, the mixed gas cannot be delivered to the protective sleeve. At the same time, the docking component at the bottom of the storage liner is in the closed state, which can prevent the liquid alkali stored inside the storage liner from flowing out. 3. When the docking assembly is working in this invention, when the storage liner is inserted into the protective sleeve, the top of the connecting pipe will first be inserted into the docking groove. At the same time as insertion, the top of the bridge connecting pipe will be in contact with the top surface of the docking groove. Press the bridge connecting pipe down so that the top of the bridge connecting pipe is flush with the top of the connecting pipe. At this time, the top of the bridge connecting pipe is connected to the transition cavity, and the grid opening will slide to be connected to the side opening. 4. When the feedback control component of this invention is working, after the mass of the storage liner increases, the storage liner will slide downward. At this time, the lifting spring contracts and the first spring contracts further. During the descent, the two contact rods will be pressed down, causing the second spring to stretch further until the top of the support ring is in contact with the inner top surface of the cavity. At this time, the grid opening slides to below the side opening, and the side opening is closed to cut off the supply of mixed gas. Attached Figure Description

[0016] Figure 1 This invention provides a front-view three-dimensional structural diagram of a solvent recovery device in the production process of glyphosate aqueous solution; Figure 2 This invention provides a front-view three-dimensional structural diagram of the neutralization device in the solvent recovery unit during the production of glyphosate aqueous solution; Figure 3 This invention provides a cross-sectional three-dimensional structural diagram of the neutralization device in the solvent recovery unit during the production of glyphosate aqueous solution; Figure 4 This invention provides a cross-sectional three-dimensional structural diagram of a protective sleeve in a solvent recovery device during the production of glyphosate aqueous solution; Figure 5 This invention provides a cross-sectional three-dimensional structural diagram of the storage liner in the solvent recovery device during the production of glyphosate aqueous solution; Figure 6 For the present invention Figure 3 A magnified view of a portion of point A in the middle; Figure 7 For the present invention Figure 4 A magnified view of a portion of point B in the middle; Figure 8 For the present invention Figure 5 A magnified view of a portion of point C.

[0017] In the diagram: 1. Hydrolysis vessel; 2. Neutralization device; 3. Pipeline; 4. Methanol recovery unit; 5. Protective sleeve; 6. End cap; 7. Storage liner; 8. Filter cover; 9. Lime drying sheet; 10. Nylon ring; 11. Conical guide ring; 12. Sponge plug; 13. Honeycomb plate; 14. Rotating shaft; 15. Lever; 16. Outer ring; 17. Limiting ring; 18. Annular pad; 19. Lifting spring; 20. Conical cavity; 21. Constraint sleeve ; 22. Support rod; 23. Vortex blade; 24. Fixed column; 25. Inner cavity; 26. Annular groove; 27. First spring; 28. Drooping slider; 29. ​​Connecting groove; 30. Transition cavity; 31. Diverting hole; 32. Support ring; 33. Fixed cover; 34. Drooping tube; 35. Slide plate; 36. Connecting pipe; 37. Retaining ring; 38. Contact rod; 39. Second spring; 40. Bridge pipe; 41. Side opening; 42. Grid opening. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figure 1-8 The present invention provides a technical solution: a solvent recovery device in the production process of glyphosate aqueous solution, including a hydrolysis kettle 1, a methanol recovery unit 4 and a pipeline 3. A neutralization device 2 is provided between the hydrolysis kettle 1 and the methanol recovery unit 4. The neutralization device 2 includes a protective sleeve 5. An end cap 6 is provided between the inner walls of the protective sleeve 5 near the top edge. The top of the end cap 6 is connected to the methanol recovery unit 4 through the pipeline 3. The bottom of the protective sleeve 5 is connected to the hydrolysis kettle 1 through the pipeline 3. A feedback control component is installed on the inner bottom surface of the protective sleeve 5 at the connection point of the pipe 3. A storage liner 7 is installed inside the protective sleeve 5, and a docking component is installed at the bottom of the storage liner 7. A limit ring 17 is fixed between the inner walls of the protective sleeve 5, and an annular pad 18 is slidably connected between the inner walls of the protective sleeve 5. The top of the annular pad 18 is in contact with the bottom of the limit ring 17, and a lifting spring 19 is fixed to the bottom of the annular pad 18. The bottom of the lifting spring 19 is fixed to the inner bottom surface of the protective sleeve 5. An outer ring opening 16 is opened on the outer surface of the storage liner 7 near the bottom edge. The inner wall of the outer ring opening 16 is connected to the limit ring 17. The inner walls of ring 17 are in close contact with each other, the bottom of storage liner 7 is in close contact with the top of annular pad 18, a conical guide ring 11 is fixed between the inner walls of storage liner 7 in the middle, a sponge plug 12 is provided between the inner walls of conical guide ring 11, a nylon ring 10 is provided near the top of conical guide ring 11 close to the inner wall of storage liner 7, a filter cover 8 is provided near the top edge between the inner walls of storage liner 7, a lime drying sheet 9 is provided on the inner bottom surface of filter cover 8, the bottom edge of filter cover 8 is in close contact with the top of nylon ring 10, and a honeycomb plate 13 is fixed between the inner walls of storage liner 7 below conical guide ring 11.

[0020] The desired effect is as follows: First, liquid alkali is injected into the storage liner 7. Then, a mixture of methanol, methylal, chloromethane, and water vapor from the hydrolysis reactor 1 is passed into the neutralization device for neutralization with liquid alkali. The mixture then enters the methanol recovery unit 4, where methanol and methylal are separated. Within the neutralization device, a connecting component opens the flow channel of the mixed gas, allowing it to contact the liquid alkali for neutralization. During neutralization, a feedback control component controls the flow of the mixed gas, cutting off the supply when the liquid alkali concentration is low. The storage liner 7, after storing the liquid alkali, must first be installed inside the protective sleeve 5. Before the storage liner 7 is installed inside the protective sleeve 5... The feedback control component inside the protective sleeve 5 is in the closed state, so the mixed gas cannot be delivered to the protective sleeve 5. At the same time, the docking component at the bottom of the storage liner 7 is in the closed state, which can prevent the liquid alkali stored inside the storage liner 7 from flowing out. By setting the honeycomb plate 13, the mixed gas flow can be evenly dispersed, which is convenient for neutralization with the liquid alkali. A lime drying sheet 9 is set on the filter cover 8, which can absorb the moisture contained in the neutralized mixed gas, and prevent the mixed gas from carrying away the water vapor, which would reduce the quality of the storage liner 7 after the reaction. When in use, the liquid alkali is usually sodium hydroxide solution. The sodium hydroxide solution reacts with the hydrochloric acid inside the mixed gas to produce sodium chloride and water.

[0021] like Figure 3 , Figure 5 , Figure 6 and Figure 8As shown, the docking assembly includes a pendant slider 28. A fixed post 24 is located at the center of the bottom of the storage liner 7. An inner cavity 25 is formed inside the fixed post 24, with its bottom extending to the bottom of the fixed post 24. A conical cavity 20 is formed on the inner bottom surface of the storage liner 7 above the fixed post 24. The top surface of the conical cavity 20 is cylindrical and extends to the inner bottom surface of the storage liner 7. The pendant slider 28 is slidably disposed between the inner walls of the inner cavity 25. A docking groove 29 is formed at the bottom of the pendant slider 28. The pendant portion of the pendant slider 28 slides through the conical cavity 20. A transition cavity 30 is formed inside the pendant slider 28, with its bottom communicating with the docking groove 29. Multiple diversion holes 31 are equidistantly formed along the circumferential direction on the top surface of the transition cavity 30. One end of each diversion hole 31 extends to the outer surface of the pendant slider 28. A support ring 32 is provided on the outer surface of block 28 below the drooping part. An annular groove 26 is provided on the inner top surface of the inner cavity 25 near the edge. A first spring 27 is fixed between the top of the drooping slider 28 near the edge of the outer surface and the inner top surface of the annular groove 26. A rotating shaft 14 is provided on the inner top surface of the conical cavity 20 in the cylindrical through-hole. A constraint sleeve 21 is rotatably fitted on the outer surface of the rotating shaft 14. Multiple support rods 22 are fixed on the outer surface of the constraint sleeve 21. One end of each support rod 22 is fixed on the inner wall of the cylindrical through-hole on the inner top surface of the conical cavity 20. Multiple vortex blades 23 are fixed at equal intervals along the circumferential direction on the outer surface of the rotating shaft 14 near the bottom edge. The multiple vortex blades 23 are located above the top of the conical cavity 20. The top of the rotating shaft 14 extends into the interior of the storage liner 7. Multiple levers 15 are fixed at equal intervals on the outer surface of the rotating shaft 14 near the top edge.

[0022] The effect achieved is that, before the storage liner 7 is inserted into the protective sleeve 5, under the elastic force of the first spring 27, the bottom of the drooping slider 28 is in contact with the bottom surface of the inner cavity 25, and the openings of the multiple diversion holes 31 are in contact with the inner wall of the connecting part between the conical cavity 20 and the inner cavity 25, thus being in a closed state. At the same time, under the elastic tension of the second spring 39, the top of the slide plate 35 is in contact with the bottom of the retaining ring 37. At this time, the grid opening 42 is located above the side opening 41 and is in a non-conductive state. When the storage liner 7 is installed inside the protective sleeve 5, the top of the connecting pipe 36 first inserts into the docking groove 29. Simultaneously, the top of the bridge connecting pipe 40 aligns with the top surface of the docking groove 29. The bridge connecting pipe 40 is then pressed downwards, making its top flush with the top of the connecting pipe 36. At this point, the top of the bridge connecting pipe 40 communicates with the transition cavity 30, and the grid opening 42 slides to communicate with the side opening 41. At this time, the tops of the two contact rods 38 are still... At a certain distance, and with the bottom of the storage liner 7 not in contact with the top of the annular pad 18, as the storage liner 7 continues to slide downwards, it will push the pendant slider 28 upwards until the bottom of the storage liner 7 is in contact with the tops of the two contact rods 38. At the same time, the bottom of the storage liner 7 near the outer surface edge is in contact with the top of the annular pad 18. At this time, the pendant head of the pendant slider 28 extends into the conical cavity 20, and the multiple diversion holes 31 on the pendant slider 28 are interconnected with the interior of the conical cavity 20. At this time, there is a certain distance between the top of the support ring 32 and the inner top surface of the inner cavity 25. The mixed gas can then enter the grid opening 42 through the side opening 41, then enter the transition cavity 30 through the bridge pipe 40, and then flow into the conical cavity 20 through the diversion hole 31. When the mixed gas flows into the storage liner 7 from the top of the conical cavity 20, it will drive multiple vortex blades 23 to drive the rotating shaft 14 to rotate, which in turn drives multiple levers 15 to rotate in the storage liner 7, thus dispersing the mixed gas that enters the storage liner 7.

[0023] like Figure 3 , Figure 4 , Figure 6 and Figure 7As shown, the feedback control assembly includes a bridging pipe 40. A fixing cover 33 is installed at the middle of the inner bottom surface of the protective sleeve 5. The top of the fixing cover 33 is connected to a connecting pipe 36. The top of the connecting pipe 36 is engaged inside the docking groove 29. The bottom of the fixing cover 33 is connected to the opening of the pipe 3 at the bottom of the protective sleeve 5. A drop pipe 34 is fixed between the inner walls of the opening of the pipe 3 at the bottom of the protective sleeve 5. The drop pipe 34 extends downward. The bridging pipe 40 is located inside the fixing cover 33. The top of the bridging pipe 40 slides and extends above the connecting pipe 36, and the outer surface of the bridging pipe 40 slides and seals against the inner wall of the connecting pipe 36. The bottom of the bridging pipe 40 extends to the bottom of the drop pipe 34. The structure is closed with an open top. Multiple grid openings 42 are equidistantly provided on the outer surface of the bridge tube 40 near the bottom edge along the circumferential direction. Multiple side openings 41 are equidistantly provided on the outer surface of the drop tube 34 near the bottom edge along the circumferential direction. The multiple side openings 41 are connected to the grid openings 42. A retaining ring 37 is fixed between the inner walls of the fixed cover 33 at the upper edge. A sliding plate 35 is slidably provided between the inner walls of the fixed cover 33. The top of the sliding plate 35 is in contact with the bottom of the retaining ring 37. A second spring 39 is fixed between the top of the sliding plate 35 and the inner top surface of the fixed cover 33. Contact rods 38 are fixed near the two side edges of the top of the sliding plate 35. The tops of the two contact rods 38 extend through to the top of the fixed cover 33.

[0024] The effect is that when the mixed gas is neutralized inside the storage liner 7, a chemical reaction occurs. After the reaction, the hydrochloric acid molecules contained in the mixed gas will merge into the liquid alkali. Therefore, the more liquid alkali is consumed in the storage liner 7, the more hydrochloric acid is neutralized, and the greater the overall mass of the storage liner 7 will be. After the mass of the storage liner 7 increases, the storage liner 7 will slide downward. At this time, the lifting spring 19 contracts and the first spring 27 contracts further. During the descent, the two contact rods 38 will be pressed downward, causing the second spring 39 to stretch further until the top of the support ring 32 is in contact with the inner top surface of the inner cavity 25. At this time, the grid opening 42 slides to below the side opening 41, and the side opening 41 is closed, which cuts off the supply of mixed gas. This also indicates that the liquid alkali inside the storage liner 7 has been consumed more and the concentration has decreased, so the liquid alkali inside the storage liner 7 can be replaced. When replacing and removing the storage liner 7, since the downward pressure of the storage liner 7 is lost, the feedback control component and docking component can instantly return to the initial state, making it convenient for people to replace the liquid alkali.

[0025] Working Principle: When using this device, liquid alkali is first injected into the storage tank 7. Then, a mixture of methanol, methylal, chloromethane, and water vapor from the hydrolysis reactor 1 is passed into the neutralization device for neutralization with liquid alkali, and then enters the methanol recovery unit 4 to separate methanol and methylal. Before the storage tank 7 is installed inside the protective sleeve 5, the feedback control component inside the protective sleeve 5 is in the closed state, and the mixed gas cannot be delivered to the protective sleeve 5. At the same time, the docking component at the bottom of the storage tank 7 is in the closed state, which can prevent the liquid alkali stored inside the storage tank 7 from flowing out. Before the storage tank 7 is installed inside the protective sleeve 5, the bottom of the drooping slider 28 is in contact with the inner bottom surface of the inner cavity 25 under the elastic force of the first spring 27. Multiple diversion holes The openings of 31 are all in a closed state, closely fitted to the inner wall of the connecting part between the conical cavity 20 and the inner cavity 25. Simultaneously, under the elastic tension of the second spring 39, the top of the sliding plate 35 is fitted to the bottom of the retaining ring 37. At this time, the grid opening 42 is located above the side opening 41 and is in a non-conductive state. When the storage liner 7 is inserted into the protective sleeve 5, the top of the connecting pipe 36 first inserts into the docking groove 29. At the same time, the top of the bridge connecting pipe 40 fits against the inner top surface of the docking groove 29. The bridge connecting pipe 40 is pressed downwards, making its top flush with the top of the connecting pipe 36. At this time, the top of the bridge connecting pipe 40 is connected to the transition cavity 30, and the grid opening 42 slides to connect with the side opening 41. At this point, the two... There is still a certain distance between the top of the contact rod 38 and the bottom of the storage liner 7, and the bottom of the storage liner 7 is not in contact with the top of the annular pad 18. As the storage liner 7 continues to slide downward, it will push the pendant slider 28 upward until the bottom of the storage liner 7 is in contact with the tops of the two contact rods 38. At the same time, the bottom of the storage liner 7 near the outer surface edge is in contact with the top of the annular pad 18. At this time, the top of the pendant slider 28 extends into the conical cavity 20. The multiple diversion holes 31 on the pendant slider 28 are interconnected with the interior of the conical cavity 20. At this time, there is a certain distance between the top of the support ring 32 and the inner top surface of the inner cavity 25. At this time, the mixed gas can enter the grid opening 42 through the side opening 41, and then pass through the bridge pipe 4. The gas enters the transition cavity 30 and then flows into the conical cavity 20 through the diversion hole 31. When the mixed gas flows into the storage liner 7 from the top of the conical cavity 20, it drives multiple vortex blades 23 to rotate the rotating shaft 14, which in turn drives multiple levers 15 to rotate in the storage liner 7, dispersing the mixed gas entering the storage liner 7. When the mixed gas is neutralized in the storage liner 7, a chemical reaction occurs. After the reaction, the hydrochloric acid molecules contained in the mixed gas will merge into the liquid alkali. Therefore, the more liquid alkali is consumed in the storage liner 7, the more hydrochloric acid is neutralized, and the greater the overall mass of the storage liner 7 will be. After the mass of the storage liner 7 increases, the storage liner 7 will slide downward. At this time, the lifting spring 19 contracts and the first spring 27 contracts further.During descent, the two contact rods 38 are pressed downwards, further stretching the second spring 39 until the top of the support ring 32 is in contact with the inner top surface of the inner cavity 25. At this point, the grid opening 42 slides below the side opening 41, closing the side opening 41 and cutting off the supply of the mixed gas. This also indicates that the liquid alkali inside the storage liner 7 has been largely consumed and its concentration has decreased, allowing for replacement of the liquid alkali inside the storage liner 7. When replacing and removing the storage liner 7, the feedback control component and docking component instantly return to their initial state due to the loss of downward pressure from the storage liner 7, facilitating the replacement of the liquid alkali.

[0026] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A solvent recovery device for the production process of glyphosate aqueous solution, characterized in that, The system includes a hydrolysis reactor (1), a methanol recovery unit (4), and a pipeline (3). A neutralization device (2) is provided between the hydrolysis reactor (1) and the methanol recovery unit (4). The neutralization device (2) includes a protective sleeve (5). An end cap (6) is provided between the inner walls of the protective sleeve (5) near the top edge. The top of the end cap (6) is connected to the methanol recovery unit (4) through the pipeline (3). The bottom of the protective sleeve (5) is connected to the hydrolysis reactor (1) through the pipeline (3). The bottom surface of the protective sleeve (5) is provided with a feedback control component at the connection point of the pipe (3), and a storage liner (7) is provided inside the protective sleeve (5). A docking component is provided at the bottom of the storage liner (7).

2. The solvent recovery device in the production process of glyphosate aqueous solution according to claim 1, characterized in that: A limiting ring (17) is fixed between the inner walls of the protective sleeve (5), and an annular pad (18) is slidably connected between the inner walls of the protective sleeve (5). The top of the annular pad (18) is in contact with the bottom of the limiting ring (17). A lifting spring (19) is fixed to the bottom of the annular pad (18). The bottom of the lifting spring (19) is fixed to the inner bottom surface of the protective sleeve (5). An outer ring opening (16) is opened on the outer surface of the storage liner (7) near the bottom edge. The inner wall of the outer ring opening (16) is in contact with the inner wall of the limiting ring (17). The bottom of the storage liner (7) is in contact with the top of the annular pad (18).

3. The solvent recovery device in the production process of glyphosate aqueous solution according to claim 1, characterized in that: A conical guide ring (11) is fixed between the inner walls of the storage liner (7) at the middle position. A sponge plug (12) is provided between the inner walls of the conical guide ring (11). A nylon ring (10) is provided near the inner wall of the storage liner (7) at the top of the conical guide ring (11). A filter cover (8) is provided between the inner walls of the storage liner (7) near the top edge. A lime drying sheet (9) is provided on the inner bottom surface of the filter cover (8). The bottom edge of the filter cover (8) is in contact with the top of the nylon ring (10). A honeycomb plate (13) is fixed between the inner walls of the storage liner (7) below the conical guide ring (11).

4. The solvent recovery device in the production process of glyphosate aqueous solution according to claim 1, characterized in that: The docking assembly includes a pendant slider (28), and a fixed post (24) is provided at the middle of the bottom of the storage liner (7). An inner cavity (25) is provided inside the fixed post (24), and the bottom of the inner cavity (25) extends to the bottom of the fixed post (24). A conical cavity (20) is provided on the inner bottom surface of the storage liner (7) above the fixed post (24), and the top surface of the conical cavity (20) is cylindrical and extends to the inner bottom surface of the storage liner (7).

5. The solvent recovery device in the production process of glyphosate aqueous solution according to claim 4, characterized in that: The drooping head slider (28) is slidably disposed between the inner walls of the inner cavity (25). The bottom of the drooping head slider (28) is provided with a docking groove (29). The top drooping head of the drooping head slider (28) slides through into the interior of the conical cavity (20). The interior of the drooping head slider (28) is provided with a transition cavity (30). The bottom of the transition cavity (30) is connected to the docking groove (29).

6. The solvent recovery device in the production process of glyphosate aqueous solution according to claim 5, characterized in that: The inner top surface of the transition cavity (30) is provided with a plurality of diversion holes (31) at equal intervals along the circumferential direction. One end of each of the plurality of diversion holes (31) extends through to the outer surface of the pendant slider (28). A support ring (32) is provided on the outer surface of the pendant slider (28) below the pendant part. An annular groove (26) is provided on the inner top surface of the inner cavity (25) near the edge. A first spring (27) is fixed between the top of the pendant slider (28) near the edge of the outer surface and the inner top surface of the annular groove (26).

7. A solvent recovery device for the production process of glyphosate aqueous solution according to claim 6, characterized in that: The top surface of the conical cavity (20) is provided with a rotating shaft (14) located in the cylindrical through-hole. The outer surface of the rotating shaft (14) is fitted with a constraint sleeve (21). The outer surface of the constraint sleeve (21) is fixed with multiple support rods (22). One end of each of the multiple support rods (22) is fixed to the inner wall of the cylindrical through-hole on the top surface of the conical cavity (20). The outer surface of the rotating shaft (14) is fixed with multiple vortex blades (23) at equal intervals along the circumferential direction near the bottom edge. The multiple vortex blades (23) are located above the top of the conical cavity (20). The top of the rotating shaft (14) extends into the interior of the storage liner (7). The outer surface of the rotating shaft (14) is fixed with multiple levers (15) at equal intervals near the top edge.

8. The solvent recovery device in the production process of glyphosate aqueous solution according to claim 7, characterized in that: The feedback control component includes a bridge pipe (40), a fixing cover (33) is installed at the middle of the inner bottom surface of the protective sleeve (5), the top of the fixing cover (33) is connected to a connecting pipe (36), the top of the connecting pipe (36) is engaged inside the docking groove (29), the bottom of the fixing cover (33) is connected to the opening of the pipe (3) at the bottom of the protective sleeve (5), and a drop pipe (34) is fixed between the inner walls of the opening of the pipe (3) at the bottom of the protective sleeve (5), with the drop end of the drop pipe (34) extending downward.

9. A solvent recovery device for the production process of glyphosate aqueous solution according to claim 8, characterized in that: The bridge connector (40) is located inside the fixed cover (33). The top of the bridge connector (40) slides to the top of the connecting pipe (36), and the outer surface of the bridge connector (40) slides and seals against the inner wall of the connecting pipe (36). The bottom of the bridge connector (40) extends to the bottom of the drop tube (34). The bottom of the bridge connector (40) is closed, and the top is open. Multiple grid openings (42) are equidistantly provided on the outer surface of the bridge connector (40) near the bottom edge along the circumferential direction. Multiple side openings (41) are equidistantly provided on the outer surface of the drop tube (34) near the bottom edge along the circumferential direction. The multiple side openings (41) are all connected to the grid openings (42).

10. A solvent recovery device for the production process of glyphosate aqueous solution according to claim 9, characterized in that: A retaining ring (37) is fixed between the inner walls of the fixed cover (33) at the upper edge. A sliding plate (35) is slidably arranged between the inner walls of the fixed cover (33). The top of the sliding plate (35) is in contact with the bottom of the retaining ring (37). A second spring (39) is fixed between the top of the sliding plate (35) and the inner top surface of the fixed cover (33). Contact rods (38) are fixed near the two side edges of the top of the sliding plate (35). The tops of the two contact rods (38) extend through to the top of the fixed cover (33).

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