Desolventizing device for glyphosate production

Abstract

The utility model discloses a desolventizing device for glyphosate production, which comprises a desolventizing main body device, a condensing device, a chloromethane content analysis device, a vacuum device and a gas compression device, the desolventizing main body device comprises a first-stage desolventizing tower, a second-stage desolventizing tower and a third-stage desolventizing tower which are sequentially connected in series and are different in desolventizing temperature, and the first-stage desolventizing tower, the second-stage desolventizing tower and the third-stage desolventizing tower are respectively connected with a condensing device; the condensing device is respectively connected with the chloromethane content analysis device, the vacuum device and the gas compression device; in general, the desolventizing device has the advantages of thorough desolventizing, high desolventizing efficiency, strong continuity, few side reactions and high automation degree.

Description

Technical Field

[0001] The utility model belongs to the technical field of glyphosate production, and particularly relates to a desolventizing device for glyphosate production. Background Technique

[0002] Glyphosate has the characteristics of high efficiency, low toxicity, broad spectrum and non-selectivity. Its performance is excellent, and it is the herbicide with the largest production and sales volume and the most popular in the world. In the prior art, the main methods for producing glyphosate are the IDA method and the alkyl ester method. At present, the method adopted for glyphosate production in China is mainly the alkyl ester method. The specific route is to use glycine, dimethyl phosphite and paraformaldehyde as raw materials for addition and condensation to prepare a synthesis solution, which is then pumped into a hydrolysis kettle, and then hydrolyzed, desolventized and crystallized with alkali by adding hydrochloric acid.

[0003] In the process of producing glyphosate by the alkyl ester method, the desolventizing section often determines the quality of the glyphosate product. At present, the most commonly used method in the desolventizing section is to desolventize the glyphosate hydrolysis solution by the kettle desolventizing method, that is, to desolventize at different temperatures in the reaction kettle. The temperature is mainly divided into three stages. The whole desolventizing process is carried out in the kettle and is intermittent and discontinuous. This method has a slow desolventizing efficiency, poor continuity, incomplete desolventizing, many side reactions and low automation. Many detections require manual sampling and chemical analysis, resulting in unstable quality of the glyphosate product, more impurities, and it has been very difficult to improve the main content of the glyphosate product.

[0004] Therefore, in order to improve the production efficiency and product quality of glyphosate, reduce side reactions in glyphosate production, strengthen automatic management and realize continuous production, we need to improve the desolventizing device in glyphosate production to solve the problems that plague the production efficiency and quality of glyphosate. Content of the Utility Model

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art, and provide a desolventizing device for glyphosate production, which performs staged desolventization on the glyphosate hydrolysis solution, and the desolventizing temperature of each stage is set differently. It can desolventize the desolventizing section more thoroughly, and carry out continuous feeding and discharging, implement continuous desolventization, improve production efficiency and product quality, while reducing on-site manual operation and analysis and determination, making the operation safer, labor-saving, and with higher automation.

[0006] The object of the present utility model is achieved as follows: A solvent stripping device for glyphosate production includes a solvent stripping main device, a condensation device, a methyl chloride content analysis device, a vacuum device, and a gas compression device. The solvent stripping main device includes a first-stage solvent stripping tower, a second-stage solvent stripping tower, and a third-stage solvent stripping tower that are connected in series in sequence and are set with different solvent stripping temperatures for each stage. The first-stage solvent stripping tower, the second-stage solvent stripping tower, and the third-stage solvent stripping tower are respectively connected to a condensation device, and the condensation device is respectively connected to a methyl chloride content analysis device, a vacuum device, and a gas compression device;

[0007] Among them, the first-stage solvent stripping tower, the second-stage solvent stripping tower, and the third-stage solvent stripping tower have the same structure and both include a tower kettle and a tower body. The tower kettle is provided with a feed inlet and a discharge outlet. A feed pipeline is provided at the feed inlet for feeding the glyphosate hydrolysis solution. A discharge pipeline is provided at the discharge outlet and is connected to the feed pipeline of the next-stage solvent stripping tower kettle or a product withdrawal tank. A circulation port is provided on the tower kettle, and a circulation pipeline is connected to the circulation port. The circulation pipeline is connected to the circulation feed inlet on the tower body for material circulation inside the solvent stripping tower. The tower body is provided with an interlayer for introducing steam for heating. The top of the tower body is connected to the inlet of the condensation device through a gas phase pipeline. The outlet of the condensation device is connected to an outlet pipeline. The reflux port of the condensation device is connected to the top of the tower body through a reflux pipeline. The product withdrawal port of the condensation device is connected to a condensate product withdrawal pipeline;

[0008] Among them, a methyl chloride content analysis device is provided on the outlet pipeline of the condensation device, and the outlet pipeline is also connected to a vacuum device and a gas compression device.

[0009] Further, the solvent stripping temperatures of the first-stage solvent stripping tower, the second-stage solvent stripping tower, and the third-stage solvent stripping tower are set in sequence from high to low.

[0010] Further, an emergency discharge port for emergency discharging is also provided at the lower part on one side of the tower kettle.

[0011] Further, an on-line thermometer, a radar level gauge, and a vacuum gauge are installed on the tower kettle.

[0012] Further, liquid flow meters and solenoid valves are respectively provided on the feed pipeline, the discharge pipeline, and the circulation pipeline.

[0013] Further, a discharge pump and a circulation pump are respectively provided on the discharge pipeline and the circulation pipeline.

[0014] Further, the circulation pipeline and the reflux pipeline respectively extend into the tower body above the packing layer and are connected to a distributor.

[0015] Further, the condensation device adopts two horizontally arranged tube condensers connected in series.

[0016] Further, online thermometers are provided in both the middle and the top of the tower body, and a vacuum gauge is provided on the gas-phase pipeline at the top of the tower body.

[0017] Further, it further includes a remote control system which is respectively connected to the stripping main device, the condensation device, the methyl chloride content analysis device, the vacuum device and the gas compression device, and the remote control system adopts a DCS computer control system.

[0018] The beneficial effects of the present utility model are as follows: in the present utility model, by performing staged stripping on the glyphosate hydrolysis solution and setting different stripping temperatures for each stage, the stripping section can be made more thorough, side reactions can be reduced, and the product quality can be improved; by performing continuous feeding and discharging and implementing continuous stripping, the glyphosate production is made continuous, greatly improving the production efficiency; by setting a methyl chloride content analysis device, on-site manual operation and analysis and determination are reduced, the operation is safer, labor is saved, and the degree of automation is higher; generally, the present utility model has the advantages of thorough stripping, high stripping efficiency, strong continuity, few side reactions and high degree of automation. Description of the Drawings

[0019] Figure 1 is the structural schematic diagram of the present utility model.

[0020] Figure 2 is the structural schematic diagram of the first-stage stripping tower and the condensation device in the present utility model.

[0021] In the figure: 1. Stripping main device 2. Condensation device 3. Methyl chloride content analysis device 4. Vacuum device 5. Gas compression device;

[0022] 11. First-stage stripping tower 12. Second-stage stripping tower 13. Third-stage stripping tower;

[0023] 01. Tower kettle 02. Tower body;

[0024] a. Feed pipeline b. Discharge pipeline c. Circulation pipeline d. Gas-phase pipeline e. Outlet pipeline f. Return pipeline g. Condensate extraction pipeline h. Emergency discharge port i. Online thermometer j. Radar level gauge k. Vacuum gauge l. Liquid flowmeter m. Solenoid valve n. Discharge pump o. Circulation pump. Detailed Embodiments

[0025] The technical solutions of the present utility model will be further specifically described below in conjunction with the drawings.

[0026] As Figure 1 、 Figure 2 shown, a stripping device for glyphosate production includes a stripping main device 1, a condensation device 2, a methyl chloride content analysis device 3, a vacuum device 4 and a gas compression device 5.

[0027] Among them, the desolvation main device 1 includes a primary desolvation tower 11, a secondary desolvation tower 12, and a tertiary desolvation tower 13 that are connected in series in sequence and have different desolvation temperatures for each stage. Preferably, the desolvation temperatures of the primary desolvation tower 11, the secondary desolvation tower 12, and the tertiary desolvation tower 13 are set in descending order. The primary desolvation tower 11, the secondary desolvation tower 12, and the tertiary desolvation tower 13 are respectively connected to a condensation device 2, and the condensation device 2 is respectively connected to a methyl chloride content analysis device 3, a vacuum device 4, and a gas compression device 5.

[0028] Among them, the primary desolvation tower 11, the secondary desolvation tower 12, and the tertiary desolvation tower 13 have the same structure and both include a tower kettle 01 and a tower body 02. The tower kettle 01 and the tower body 02 can be fixedly connected by a bolt structure with a gasket in the middle.

[0029] Specifically, a feed inlet and a discharge outlet are provided on the tower kettle 01. A feed pipeline a is provided at the feed inlet for feeding the glyphosate hydrolysis solution, and a discharge pipeline b is provided at the discharge outlet and is connected to the feed pipeline of the tower kettle of the next-stage desolvation tower or a sampling tank. That is, the tower kettles 01 of the primary desolvation tower 11, the secondary desolvation tower 12, and the tertiary desolvation tower 13 are connected in series in sequence. The feed pipeline of the tower kettle of the primary desolvation tower 11 is used for feeding the glyphosate hydrolysis solution. The discharge pipeline of the tower kettle of the primary desolvation tower 11 is connected to the feed pipeline of the tower kettle 01 of the secondary desolvation tower 12. The discharge pipeline of the tower kettle 01 of the secondary desolvation tower 12 is connected to the feed pipeline of the tower kettle 01 of the tertiary desolvation tower 13. The discharge pipeline of the tower kettle 01 of the tertiary desolvation tower 13 is connected to a sampling tank, and the sampling tank is used for sampling and collecting the desolvated solution.

[0030] Preferably, a liquid flowmeter l and a solenoid valve m are respectively provided on the feed pipeline a and the discharge pipeline b for precisely regulating the flow rate and controlling the desolvation process. The liquid flowmeter l can adopt an online digital display mode flowmeter, which is more accurate and precise in control, and has a remote transmission function, enabling remote control and adjustment, with a short reaction time and the ability to quickly solve problems when there are issues. A discharge pump n is also provided on the discharge pipeline b.

[0031] Specifically, a circulation port is provided on the tower kettle 01, and a circulation pipeline c is connected to the circulation port. The circulation pipeline c is connected to the circulation feed inlet on the tower body 02 for material circulation inside the desolvation tower. Specifically, a liquid flowmeter l and a solenoid valve m are provided on the circulation pipeline c, a circulation pump o is provided on the circulation pipeline c, and the top end of the circulation pipeline c extends into the tower body 02 above the packing layer and is connected to a distributor.

[0032] Preferably, an emergency discharge port h for emergency discharging is further provided at the lower part on one side of the column still 01; an on-line thermometer i, a radar level gauge j and a vacuum gauge k are installed on the column still 01. The level gauge of the column still 02 uses a radar level gauge, replacing the traditional external tube type level gauge outside the kettle, with more accurate measurement and the ability to perform remote transmission of the measured data, which is convenient and safe.

[0033] Specifically, the column body 02 is provided with a jacket for introducing steam for heating. Preferably, on-line thermometers i are provided in both the middle and the top of the column body 02. The top of the column body 02 is connected to the inlet of the condensation device 2 through a gas phase pipeline d. Preferably, a vacuum gauge k is provided on the gas phase pipeline d. The outlet of the condensation device 2 is connected to an outlet pipeline e. The reflux port of the condensation device 2 is connected to the top of the column body 02 through a reflux pipeline f. The reflux pipeline f extends into the interior of the column body 02 above the packing layer and is connected with a distributor. The extraction port of the condensation device 2 is connected to a condensate extraction pipeline g. Preferably, the condensation device 2 uses two horizontally arranged tubular condensers connected in series. The use of a two-stage condenser can fully cool the gas phase materials such as methanol, methylal, and chloromethane in the desolvation process of the glyphosate hydrolysis solution. After two-stage condensation, methanol and methylal enter the rectification column for separation. The condensed tail gas is mainly chloromethane, which is relatively pure and can be used as other chemical raw materials after compression treatment.

[0034] Among them, a chloromethane content analysis device 3 is provided on the outlet pipeline e of the condensation device 2. The chloromethane content analysis device 3 is used to accurately analyze the chloromethane content in the tail gas and perform real-time monitoring and analysis of the tail gas. The outlet pipeline e is also connected to a vacuum device 4 and a gas compression device 5. The vacuum device 4 is located behind the condensation device 2 and is used to provide a negative pressure environment for the desolvation main device 1. The gas compression device 5 compresses the separated chloromethane.

[0035] Preferably, a remote control system is further included. The remote control system is respectively connected to the desolvation main device 1, the condensation device 2, the chloromethane content analysis device 3, the vacuum device 4 and the gas compression device 5. The remote control system can adopt a DCS computer control system, which can transmit the analysis and measurement results in real time and perform remote monitoring and adjustment.

[0036] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A desolventizing device for glyphosate production, characterized in that: The invention comprises a desolventizing main device (1), a condensing device (2), a chloromethane content analyzing device (3), a vacuum device (4) and a gas compressing device (5), wherein the desolventizing main device (1) comprises a primary desolventizing tower (11), a secondary desolventizing tower (12) and a tertiary desolventizing tower (13) which are sequentially connected in series and each stage of the desolventizing temperature is set differently, the primary desolventizing tower (11), the secondary desolventizing tower (12) and the tertiary desolventizing tower (13) are respectively connected to the condensing device (2), and the condensing device (2) is respectively connected to the chloromethane content analyzing device (3), the vacuum device (4) and the gas compressing device (5); The first-stage desolventizing tower (11), the second-stage desolventizing tower (12) and the third-stage desolventizing tower (13) have the same structure, and all include a tower kettle (01) and a tower body (02). The tower kettle (01) is provided with a feed port and a discharge port. The feed port is provided with a feed pipeline (a) for feeding glyphosate hydrolyzate. The discharge port is provided with a discharge pipeline (b) connected to the feed pipeline or the extraction tank of the tower kettle of the next-stage desolventizing tower. The tower kettle (01) is provided with a circulation port, and the circulation port is connected to a circulation pipeline (c). The circulation pipeline (c) is connected to the circulation feed port on the tower body (02) and is used for material circulation inside the desolventizing tower. The tower body (02) is provided with an interlayer for steam heating. The top of the tower body (02) is connected to the air inlet of the condensing device (2) through the gas phase pipeline (d). The air outlet of the condensing device (2) is connected to the air outlet pipeline (e). The reflux port of the condensing device (2) is connected to the top of the tower body (02) through the reflux pipeline (f). The production port of the condensing device (2) is connected to the condensate production pipeline (g). A chloromethane content analysis device (3) is provided on the gas outlet pipe (e) of the condensing device (2), and the gas outlet pipe (e) is also connected to a vacuum device (4) and a gas compression device (5).

2. A desolventizing device for glyphosate production according to claim 1, characterized in that: The desolventizing temperatures of the first desolventizing tower (11), the second desolventizing tower (12) and the third desolventizing tower (13) are set in descending order.

3. A desolventizing device for glyphosate production according to claim 1, characterized in that: An emergency discharge port (h) for emergency discharge is also provided at the lower part of one side of the tower kettle (01).

4. A desolventizing device for glyphosate production according to claim 1, characterized in that: An online thermometer (i), a radar level gauge (j) and a vacuum gauge (k) are installed on the tower kettle (01).

5. A desolventizing device for glyphosate production according to claim 1, characterized in that: The feed pipe (a), the discharge pipe (b) and the circulation pipe (c) are respectively provided with a liquid flow meter (l) and a solenoid valve (m).

6. A desolventizing device for glyphosate production according to claim 1, characterized in that: The discharge pipe (b) and the circulation pipe (c) are respectively provided with a discharge pump (n) and a circulation pump (o).

7. A desolventizing device for glyphosate production according to claim 1, characterized in that: The circulation pipe (c) and the reflux pipe (f) respectively extend into the upper part of the packing layer inside the tower body (02) and are connected to a distributor.

8. A desolventizing device for glyphosate production according to claim 1, characterized in that: The condensing device (2) adopts two horizontal tube condensers connected in series.

9. A desolventizing device for glyphosate production according to claim 1, characterized in that: The middle and top of the tower body (02) are both provided with online thermometers (i), and the gas phase pipeline (d) at the top of the tower body (02) is provided with a vacuum gauge (k).

10. A desolventizing device for glyphosate production according to any one of claims 1 to 9, characterized in that: It also includes a remote control system, which is respectively connected to the desolventizing main device (1), the condensing device (2), the methyl chloride content analysis device (3), the vacuum device (4) and the gas compression device (5), and the remote control system adopts a DCS computer control system.

Images