Continuous desolventizing device for glyphosate production

Abstract

The utility model discloses a continuous desolventizing device for glyphosate production, which comprises a first-stage desolventizing device, a second-stage desolventizing device and a third-stage desolventizing device which are sequentially connected in series and respectively perform step-by-step desolventizing at different temperatures, the first-stage desolventizing device, the second-stage desolventizing device and the third-stage desolventizing device adopt desolventizing kettles with the same structure to carry out desolventizing work; the first-stage desolventizing device, the second-stage desolventizing device and the third-stage desolventizing device are respectively connected with a first-stage condenser, a second-stage condenser and a third-stage condenser; the first-stage condenser, the second-stage condenser and the third-stage condenser are connected with a tail gas absorbing device and a collecting tank; a methylal online analyzer is arranged on the primary desolventizing device, and a methanol online analyzer is arranged on the secondary desolventizing device; generally, the glyphosate desolventizing device has the advantages of high desolventizing efficiency, high automatic detection and analysis degree, reduction of side reactions and improvement of glyphosate product quality.

Description

Technical Field

[0001] This utility model belongs to the field of glyphosate production technology, specifically relating to a continuous desolvation device for glyphosate production. Background Technology

[0002] Glyphosate is characterized by high efficiency, low toxicity, broad spectrum, and non-selective action. Its superior performance makes it the world's largest-selling and most popular herbicide. The main methods for producing glyphosate in existing technologies are the IDA method and the alkyl ester method. In China, the main method for producing glyphosate is the alkyl ester method. The specific production route is to use glycine, dimethyl phosphite, and paraformaldehyde as raw materials, which are added and condensed to prepare a synthetic liquid. This liquid is then fed into a hydrolysis reactor, where hydrochloric acid is added for hydrolysis, solvent removal, and alkali addition for crystallization to obtain glyphosate.

[0003] In the production of glyphosate, the desolventizing process involves adding the glyphosate synthesis liquid to a single desolventizing vessel and then heating it from approximately 30°C to 120°C to distill off methanol, methyl acetal, chloromethane, and hydrogen chloride. After neutralization, the mixture is then separated by distillation. This method has several drawbacks: First, the production process is relatively cumbersome, and the mixed condensate has a complex composition, making separation difficult. Second, the gradual increase in temperature in the single desolventizing vessel increases the occurrence of side reactions, affecting the product quality and yield of glyphosate. Finally, the lack of monitoring equipment during production makes it difficult to effectively control the desolventizing process and its effectiveness.

[0004] Therefore, in order to solve the above problems, it is necessary to develop a continuous desolvation device for glyphosate production. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a continuous desolvation device for glyphosate production, which solves the problems of cumbersome desolvation process, numerous side reactions, low glyphosate yield, and insufficient detection equipment for the desolvation process.

[0006] The purpose of this utility model is achieved as follows: a continuous desolvation device for glyphosate production, comprising a primary desolvation device, a secondary desolvation device, and a tertiary desolvation device connected in series and performing desolvation at different temperatures, wherein the primary desolvation device, the secondary desolvation device, and the tertiary desolvation device use desolvation kettles with identical structures for desolvation work;

[0007] The inlet of the primary desolventizing device is connected to a feed pipe, the primary desolventizing device and the secondary desolventizing device are connected to each other and the secondary desolventizing device and the tertiary desolventizing device are connected to a transfer pipe, and the outlet of the tertiary desolventizing device is connected to a discharge pipe.

[0008] The exhaust ports of the primary, secondary, and tertiary desolventizing devices are respectively connected to the primary, secondary, and tertiary condensers via exhaust pipes. The exhaust pipes of the primary, secondary, and tertiary condensers converge into the main gas pipe and are connected to the tail gas absorption device. The drain ports of the primary, secondary, and tertiary condensers are respectively connected to collection tanks.

[0009] The primary solvent removal unit is equipped with an online methyl acetal analyzer to analyze and determine the methyl acetal content of the material in the primary solvent removal unit, and the secondary solvent removal unit is equipped with an online methanol analyzer to analyze and determine the methanol content of the material in the secondary solvent removal unit.

[0010] Furthermore, the specific structure of the desolventizing vessel used in the primary desolventizing device, the secondary desolventizing device, and the tertiary desolventizing device is as follows: it includes a vessel lid and a vessel body, a stirring motor installed on the top of the vessel lid, and a stirring shaft and a frame-type stirring paddle connected to the stirring motor and installed inside the vessel body.

[0011] Furthermore, the vessel lid is provided with a feed inlet, an exhaust outlet, and an observation port, with explosion-proof glass installed at the observation port and an explosion-proof searchlight installed above the observation port; a discharge port is provided at the bottom of the vessel body; the vessel body is provided with a jacket and connected to a steam inlet / outlet pipe to allow steam to be introduced to heat the vessel body, and a control valve and an online gas flow meter are installed on the steam inlet / outlet pipe.

[0012] Furthermore, the feed pipe, transfer pipe, and discharge pipe are each equipped with an online liquid flow meter and a control valve, and the transfer pipe is also equipped with a transfer pump.

[0013] Furthermore, each of the primary, secondary, and tertiary solvent removal devices is equipped with an online thermometer, a radar level gauge, and a gas alarm.

[0014] Furthermore, the primary, secondary, and tertiary condensers are tubular condensers.

[0015] Furthermore, the desolventizing temperature of the material in the three-stage desolventizing device is above 120°C.

[0016] Furthermore, it also includes a DCS computer remote control system, which controls and connects the primary, secondary, and tertiary desolventizing devices, as well as the online methyl acetal analyzer and the online methanol analyzer, to achieve remote control and data acquisition and analysis.

[0017] The beneficial effects of this utility model are:

[0018] (1) The stepwise desolvation method at different temperatures makes the desolvation temperature control more precise and stable, the desolvation effect more thorough, and reduces the phenomenon of incomplete desolvation and increased side reactions caused by temperature, thereby improving the yield and quality of glyphosate.

[0019] (2) By setting up measuring devices such as an online methyl acetal analyzer, an online methanol analyzer, an online thermometer, a radar level gauge, and a gas alarm, it is possible to measure data and transmit data remotely at the same time. The DCS computer remote control system is used for data monitoring and analysis, so as to realize continuous analysis and measurement of the desolvation of materials in the reactor. It has strong real-time adjustment and response capabilities, reduces human participation in sampling and analysis, reduces analysis errors, and improves work efficiency and product quality.

[0020] (3) By setting up multi-stage condensers and collection tanks, the materials produced by desolventizing can be classified, collected and stored, reducing the distillation pressure of conventional desolventizing products;

[0021] In summary, this invention has the advantages of high desolventizing efficiency, high degree of automated detection and analysis, reduced side reactions, and improved glyphosate product quality. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 This is a schematic diagram of the desolventizing vessel in this utility model.

[0024] In the diagram: 1. Primary solvent removal device; 2. Secondary solvent removal device; 3. Tertiary solvent removal device; 4. Feed pipe; 5. Transfer pipe; 6. Discharge pipe; 7. Exhaust pipe; 8. Primary condenser; 9. Secondary condenser; 10. Tertiary condenser; 11. Main gas pipe; 12. Tail gas absorption device; 13. Collection tank; 14. Methylal online analyzer; 15. Methanol online analyzer.

[0025] 0. Desolventizing vessel 0a, vessel cover 0a1, observation port 0b, vessel body 0b1, steam inlet and outlet pipes 0c, stirring motor 0d, stirring shaft 0e, stirring paddle;

[0026] a. Control valves b. Online gas flow meters c. Online liquid flow meters d. Transfer pumps e. Online thermometers f. Radar level gauges g. Gas alarms. Detailed Implementation

[0027] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings.

[0028] like Figure 1 , Figure 2As shown, a continuous desolventizing device for glyphosate production includes a primary desolventizing device 1, a secondary desolventizing device 2, and a tertiary desolventizing device 3 connected in series and performing desolventizing at different temperatures. The primary desolventizing device 1, the secondary desolventizing device 2, and the tertiary desolventizing device 3 use desolventizing kettles 0 with identical structures for desolventizing operations.

[0029] The primary desolventizing device 1 is connected to a feed pipe 4 at its inlet. The primary desolventizing device 1 and the secondary desolventizing device 2, as well as the secondary desolventizing device 2 and the tertiary desolventizing device 3, are connected via transfer pipes 5. Specifically, the discharge port of the primary desolventizing device 1 is connected to the inlet of the secondary desolventizing device 2 via transfer pipe 5, and the discharge port of the secondary desolventizing device 2 is connected to the inlet of the tertiary desolventizing device 3 via transfer pipe 5. A transfer pump d is also installed on the transfer pipe 5. A discharge pipe 6 is connected to the discharge port of the tertiary desolventizing device 3. Material flows from the feed pipe... Feed is fed through pipe 4, and after passing through primary desolventizing unit 1, secondary desolventizing unit 2, and tertiary desolventizing unit 3 in sequence, it is discharged through discharge pipe 6. Among them, primary desolventizing unit 1 is used to preliminarily desolventize the glyphosate synthesis liquid, remove the methyl acetal generated in the reaction, and analyze and determine the material after desolventizing. Secondary desolventizing unit 2 is used to separate methanol from the material. Tertiary desolventizing unit 3 is used to further desolventize the material after secondary desolventizing. Preferably, the desolventizing temperature of the material in tertiary desolventizing unit 3 is above 120°C to ensure complete and thorough desolventizing effect.

[0030] Preferably, the solvent extraction vessel 0 used in the primary solvent extraction device 1, the secondary solvent extraction device 2, and the tertiary solvent extraction device 3 has the following specific structure: it includes a vessel cover 0a and a vessel body 0b, a stirring motor 0c located on top of the vessel cover 0a, and a stirring shaft 0d and a frame-type stirring paddle 0e connected to the stirring motor 0c and located inside the vessel body 0b; the stirring motor 0c can be a variable frequency motor, and the stirring can be set to be manually adjusted on-site or remotely controlled; a stainless steel protective net is installed outside the stirring motor 0c to prevent foreign objects from entering the motor and affecting the normal operation of the stirring motor 0c; based on the application environment, the stirring shaft 0d and the stirring paddle 0e are made of acid corrosion resistant materials.

[0031] Preferably, the vessel lid 0a is provided with a feed inlet, an exhaust outlet, and an observation port 0a1. The feed inlet is used to connect to the feed pipe 4 or the transfer pipe 5 for feeding the first-stage, second-stage, and third-stage desolvation processes. The exhaust outlet is used to connect to the exhaust pipe. An explosion-proof glass is provided at the observation port 0a1, and an explosion-proof searchlight is provided above the observation port 0a1 to facilitate observation of the reaction inside the vessel. The bottom of the vessel body 0b is provided with a discharge port, which is used to connect to the transfer pipe 5 or the discharge pipe 6 for discharging the first-stage, second-stage, and third-stage desolvation processes.

[0032] Preferably, the vessel body 0b is provided with a jacket and a level gauge, the jacket is connected to a steam inlet / outlet pipe 0b1 to introduce steam to heat the vessel body 0b, and the steam inlet / outlet pipe 0b1 is provided with a control valve a and an online gas flow meter b.

[0033] The exhaust ports of the primary desolvation device 1, the secondary desolvation device 2, and the tertiary desolvation device 3 are respectively connected to the primary condenser 8, the secondary condenser 9, and the tertiary condenser 10 via exhaust pipes 7. Preferably, the primary condenser 8, the secondary condenser 9, and the tertiary condenser 10 are tubular condensers. Using tubular condensers to cool the desolvated products provides good cooling effect and reduces impurities in the exhaust gas. The exhaust pipes 7 of the primary condenser 8, the secondary condenser 9, and the tertiary condenser 10 merge into the main gas pipe 11 and are connected to the exhaust gas absorption device 12. The absorption device 12 purifies the exhaust gas and collects chloromethane; the drain ports of the primary condenser 8, secondary condenser 9, and tertiary condenser 10 are respectively connected to collection tanks 13; wherein, the primary condenser 8 is used to condense the methylal removed by the primary desolventizing device 1 and collect it to the collection tank 13, the secondary condenser 9 is used to condense the methanol removed by the secondary desolventizing device 2 and collect it to the collection tank 13, and the tertiary condenser 10 is used to condense the material removed by the tertiary desolventizing device 3 and collect it to the collection tank 13. At this time, the condensate of the tertiary stage is mainly composed of water.

[0034] The primary solvent removal device 1 is equipped with an online methylal analyzer 14 to analyze and determine the methylal content of the material in the primary solvent removal device 1, ensuring that the methylal content of the material in the primary solvent removal device 1 is within the range of the primary solvent removal completion; the secondary solvent removal device 2 is equipped with an online methanol analyzer 15 to analyze and determine the methanol content of the material in the secondary solvent removal device 2, ensuring that the methanol content of the material in the secondary solvent removal device 2 is within the range of the secondary solvent removal completion.

[0035] Preferably, the feed pipe 4, the transfer pipe 5, and the discharge pipe 6 are each equipped with an online liquid flow meter c and a control valve a.

[0036] Preferably, each of the primary desolventizing device 1, the secondary desolventizing device 2, and the tertiary desolventizing device 3 is equipped with an online thermometer e, a radar level gauge f, and a gas alarm g. The online thermometer e is used to measure the material temperature in each stage of the desolventizing device, which can stably control the evaporation temperature of methylal and methanol, reduce the evaporation of other components, and the measured data has a remote transmission function for easy data analysis. It also facilitates the adjustment of the steam flow rate in the reactor body to control the desolventizing temperature. The radar level gauge f is used to measure the liquid level in each stage of the desolventizing device and compare it with the liquid level gauge outside the reactor body to prevent false liquid level readings. The gas alarm g is used to measure the working environment. If the value exceeds the set value, an on-site alarm will sound to prevent safety accidents caused by the failure to deal with excessive flammable and explosive gases in a timely manner.

[0037] It also includes a DCS computer remote control system, which controls and connects the primary desolventizing unit 1, the secondary desolventizing unit 2, and the tertiary desolventizing unit 3, as well as the online methyl acetal analyzer 14 and the online methanol analyzer 15, the stirring motor 0c, and control valves a, online gas flow meter b, online liquid flow meter c, transfer pump d, online thermometer e, radar level gauge f, and gas alarm g, etc., to realize remote control and data acquisition and analysis.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A continuous solvent removal device for glyphosate production, characterized in that: It includes a first-stage desolventizing device (1), a second-stage desolventizing device (2), and a third-stage desolventizing device (3) connected in series and performing desolventizing at different temperatures. The first-stage desolventizing device (1), the second-stage desolventizing device (2), and the third-stage desolventizing device (3) use a desolventizing kettle (0) with the same structure to perform desolventizing work. The inlet of the first-stage desolventizing device (1) is connected to a feed pipe (4), the first-stage desolventizing device (1) and the second-stage desolventizing device (2) are connected to each other and the second-stage desolventizing device (2) and the third-stage desolventizing device (3) are connected to each other via a transfer pipe (5), and the outlet of the third-stage desolventizing device (3) is connected to a discharge pipe (6). The exhaust ports of the first-stage desolventizing device (1), the second-stage desolventizing device (2), and the third-stage desolventizing device (3) are connected to the first-stage condenser (8), the second-stage condenser (9), and the third-stage condenser (10) respectively via exhaust pipes (7). The exhaust pipes (7) of the first-stage condenser (8), the second-stage condenser (9), and the third-stage condenser (10) merge into the main gas pipe (11) and are connected to the tail gas absorption device (12). The drain ports of the first-stage condenser (8), the second-stage condenser (9) and the third-stage condenser (10) are respectively connected to collection tanks (13). The primary solvent removal device (1) is equipped with an online methylal analyzer (14) to analyze and determine the methylal content of the material in the primary solvent removal device (1). The secondary desolventizing device (2) is equipped with an online methanol analyzer (15) to analyze and determine the methanol content in the material inside the secondary desolventizing device (2).

2. The continuous desolventizing device for glyphosate production according to claim 1, characterized in that: The specific structure of the desolventizing vessel (0) used in the first-stage desolventizing device (1), the second-stage desolventizing device (2) and the third-stage desolventizing device (3) is as follows: it includes a vessel cover (0a) and a vessel body (0b), a stirring motor (0c) set on the top of the vessel cover (0a), and a stirring shaft (0d) and a frame-type stirring paddle (0e) connected to the stirring motor (0c) and set inside the vessel body (0b).

3. A continuous desolventizing device for glyphosate production according to claim 2, characterized in that: The vessel lid (0a) is provided with a feed inlet, an exhaust outlet, and an observation port (0a1). The observation port (0a1) is equipped with explosion-proof glass, and an explosion-proof searchlight is installed above the observation port (0a1). The bottom of the vessel body (0b) is provided with a discharge port. The vessel body (0b) is provided with a jacket and is connected to a steam inlet / outlet pipe (0b1) to allow steam to be introduced to heat the vessel body (0b). The steam inlet / outlet pipe (0b1) is equipped with a control valve (a) and an online gas flow meter (b).

4. A continuous desolventizing device for glyphosate production according to claim 1, characterized in that: The feed pipe (4), transfer pipe (5), and discharge pipe (6) are each equipped with an online liquid flow meter (c) and a control valve (a), and the transfer pipe (5) is also equipped with a transfer pump (d).

5. A continuous desolventizing device for glyphosate production according to claim 1, characterized in that: The primary desolventizing device (1), the secondary desolventizing device (2), and the tertiary desolventizing device (3) are each equipped with an online thermometer (e), a radar level gauge (f), and a gas alarm (g).

6. A continuous desolventizing device for glyphosate production according to claim 1, characterized in that: The primary condenser (8), secondary condenser (9) and tertiary condenser (10) are tubular condensers.

7. A continuous desolventizing device for glyphosate production according to claim 1, characterized in that: The material desolventizing temperature in the three-stage desolventizing device (3) is above 120℃.

8. A continuous desolventizing apparatus for glyphosate production according to any one of claims 1-7, characterized in that: It also includes a DCS computer remote control system, which controls and connects the primary desolventizing device (1), the secondary desolventizing device (2) and the tertiary desolventizing device (3), as well as the methyl acetal online analyzer (14) and the methanol online analyzer (15), to realize remote control and data acquisition and analysis.

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