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Method for recycling glyphosate solvent and byproducts

A glyphosate and by-product technology, applied in the field of glyphosate solvent and by-product recovery, can solve the problems of weakening the effect of vapor phase feed to reduce process energy consumption, inability to use cooling water, and lower condensation temperature, so as to achieve saving Equipment investment, strong separation ability, and the effect of increasing the condensation temperature

Active Publication Date: 2018-05-29
吴嘉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the presence of chloromethane, the condensation temperature at the top of the second rectification tower is reduced, and cooling water cannot be used to achieve the purpose of condensation. Therefore, a large amount of frozen brine must be used for cooling, which also weakens the vapor phase feed. The role of reducing process energy consumption, greatly increasing production costs

Method used

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  • Method for recycling glyphosate solvent and byproducts
  • Method for recycling glyphosate solvent and byproducts
  • Method for recycling glyphosate solvent and byproducts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The invention provides a method for recovering glyphosate solvent and by-products, which has good energy-saving and consumption-reducing effects, high recovery rate of glyphosate solvent and by-products, high product quality, wide application prospects, and specific process route Such as figure 1 As shown, the specific method is as follows:

[0032] The steam produced by hydrolysis in the glyphosate production process is passed into the vapor phase neutralization tower 1, neutralized with lye, and the vapor phase obtained by neutralization is heated for the pre-rectification tower reboiler 5 and then passed into the pre-rectification tower In the tower 2, a part of the liquid phase obtained by neutralization is circulated back to the vapor phase neutralization tower 1, and a part is passed into the pre-rectification tower 2;

[0033] The vapor phase and the liquid phase that are passed in are obtained at the top of the pre-rectification tower 2 to contain methylal and ...

Embodiment 2

[0043] Embodiment 2 is the preferred scheme of embodiment 1, and the methanol compressor adopts the two-stage compression scheme, which can further reduce the energy consumption of the process. The specific process is as follows figure 2 As shown, the process is the same as in Example 1, the difference being that the overhead steam of the methanol refining tower 4 is compressed by a methanol compressor 15 to improve the energy grade, and a part is used as a heat source for the methanol refining tower reboiler 16, and the other part is passed through two stages. The stage methanol compressor 18 is used as a heat source for the reboiler 12 of the light ends refining column after being compressed. Because the tower bottom temperature of the light-end refining tower 3 is higher than the tower bottom temperature of the methanol refining tower 4, so in the one-stage compression scheme of embodiment 1, it is necessary to increase the grade of methanol vapor pressurization at the top ...

Embodiment 3

[0061] Embodiment 3 is the preferred scheme of embodiment 1, can further reduce process energy consumption, and concrete process is as image 3 As shown, the process is the same as in Example 1, except that an intermediate reboiler 20 is added to the methanol refining tower 4, and the methanol compressor adopts a three-stage compression scheme, specifically: the overhead steam of the methanol refining tower 4 passes through the methanol compressor 15 After one-stage compression improves the energy grade, a part is used as the heat source of the intermediate reboiler 20, and the other part enters the secondary methanol compressor 18. After compression and the grade is improved, a part is used as the heat source of the methanol refining tower reboiler 16, and the other part is passed through The three-stage methanol compressor 19 is used as a heat source for the reboiler 12 of the light components refining column after being compressed. Since the temperature distribution of meth...

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Abstract

The invention relates to a method for recycling glyphosate solvent and byproducts. By the method, methanol steam is used as a heat source for a light component refining tower reboiler and a methanol refining tower reboiler after being pressurized to increase the energy grade, and heat is reasonably used for replacing use of low-pressure or medium-pressure steam, so that when a device works normally, consumption of raw steam is not needed completely, and thus the technological energy consumption is greatly lowered and the purposes of saving energy and reducing consumption are achieved; a compressor is used for pressurizing light components, so that the light component condensing temperature is raised, thus discharged materials on the tops of a pre-rectifying tower and a light component refining tower can be cooled by cooling water and use of frozen salt water with higher cost is avoided, and thus the production cost is reduced and the technological economy is increased; in addition, bythe method, the capability of separation each component is relatively strong, and methanol and the byproduct methylal and methyl chloride are high in recycling rate, high in purity and good in quality; the method can be industrially applied.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a method for recovering glyphosate solvent and by-products. Background technique [0002] Glyphosate is a herbicide with high efficiency, low toxicity, low residue, broad spectrum and good environmental compatibility. Because of its superior performance, it has become the most widely used herbicide in the world. There are many ways to produce glyphosate. At present, the domestic production mainly adopts the alkyl ester method with glycine and dimethyl phosphite as the main raw materials. The method uses methanol as a reaction solvent, and in the presence of catalyst triethylamine, glycine first reacts with polyoxymethylene to form N,N-dimethylolglycine, and then reacts with dimethyl phosphite, then adds hydrochloric acid to hydrolyze to generate glyphosate And by-products methylal and methyl chloride. A large amount of steam is produced during the hydrolysis process, and the main ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/80C07C31/04C07C17/00C07C19/03C07C41/58C07C43/30
CPCC07C17/383C07C29/80C07C41/58C07C31/04C07C19/03C07C43/30Y02P20/10Y02P20/129Y02P20/50
Inventor 吴嘉鲍艳林龙勇胡晓萍
Owner 吴嘉
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