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Continuous treatment method for neutralizing solvent in process of producing glyphosate by using glycine method

A treatment method and technology of production process, which is applied in the field of solvent neutralization method, can solve problems such as restricting process continuity, increasing labor cost, affecting product stability, etc., and achieve the goal of improving mixing effect, saving labor cost and benefiting stability Effect

Active Publication Date: 2010-11-03
SUZHOU JIAHUI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] (2) The control of the pH value in the process is to use manual on-site hanging sample analysis, which brings a certain amount of tediousness to production management and increases labor costs
[0006] The above three points restrict the continuity of the process, increase the labor cost of production, and affect the stability of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) The hydrolyzate after precipitation in the production process of preparing glyphosate by glycine method is condensed to obtain solvent, and the solvent is placed in a large tank for buffer storage;

[0026] (2) Utilize the distributed control system (DCS system) according to pH=7, control the flowmeter and the regulating valve to initially carry out the proportioning of the solvent and the liquid caustic, and then import the static mixer to mix to obtain the mixed solution;

[0027] (3) After the mixed solution comes out of the static mixer, it is continuously neutralized through the first-level neutralization tank. Due to the desolvation process, the concentration of hydrochloric acid in the solvent is too high, and the pH meter measures the flow out of the first-level neutralization tank. The pH value is low, and the mixed solvent flows from the first-level neutralization tank into the second-level neutralization tank through the potential difference, and the DCS a...

Embodiment 2

[0029] (1) The hydrolyzate after precipitation in the production process of preparing glyphosate by glycine method is condensed to obtain solvent, and the solvent is placed in a large tank for buffer storage;

[0030] (2) Use the distributed control system (DCS system) according to pH=9, control the flow meter and the regulating valve to preliminarily carry out the proportioning of the solvent and the liquid alkali, and then import the static mixer for mixing to obtain a mixed solution;

[0031] (3) After the mixed solution comes out of the static mixer, it is continuously neutralized through the first-level neutralization tank. Due to the desolvation process, the concentration of hydrochloric acid in the solvent is too low, and the pH meter measures the flow out of the first-level neutralization tank. The pH value is too high, and the mixed solvent flows from the first-stage neutralization tank into the second-level neutralization tank through the potential difference, and the...

Embodiment 3

[0033] (1) The hydrolyzate after precipitation in the production process of preparing glyphosate by glycine method is condensed to obtain solvent, and the solvent is placed in a large tank for buffer storage;

[0034] (2) Utilize the distributed control system (DCS system) according to pH=11, control the flow meter and the regulating valve to preliminarily carry out the proportioning of the solvent and the liquid alkali, and then import the static mixer to mix to obtain the mixed solution;

[0035] (3) After the mixed solution comes out of the static mixer, it is continuously neutralized through the first-level neutralization tank. The pH meter measures that the pH value of the material flowing out of the first-level neutralization tank is too high, and the mixed solvent passes through the potential difference from the first level The neutralization tank flows into the second-level neutralization tank, and the pH meter at the outlet of the second-level neutralization tank measu...

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Abstract

The invention relates to a continuous treatment method for neutralizing a solvent in the process of producing glyphosate by using a glycine method. The method comprises the following steps of: (1) condensing hydrolysate subjected to precipitation to obtain a solvent, placing the solvent in a large trough and storing in a buffer mode in the production process for preparing glyphosate by using the glycine method; (2) proportioning the solvent and sodium hydroxide and introducing the materials into a static mixer for mixing to obtain a mixed solvent; and (3) taking the mixed solvent out of the static mixer and performing continuous neutralization through a two-stage neutralization still to obtain a solution with a qualified pH value. Compared with the prior art, the invention realizes the on-line pH value determination, controls the proportion of feeding materials by using a signal, solves the problem of continuous neutralization of the solvent produced in a factory, and improves the mixing effect and the stability of the production process.

Description

technical field [0001] The invention relates to a method for neutralizing a solvent, in particular to a continuous treatment method for neutralizing a solvent in the process of producing glyphosate by a glycine method. Background technique [0002] In the preparation process of glyphosate produced by the glycine method, most of the solvents are removed from the hydrolyzate after the desolventization process, and its main components are methanol, hydrogen chloride, by-product methylal and water. After being condensed by the condenser, the mixed solvent is obtained. The mixed solvent is recovered through the methylal recovery tower and the methanol recovery tower to obtain the methylal product and methanol, wherein the methanol is returned to the synthesis process for reuse. During this process, due to the presence of hydrochloric acid in the mixed solvent, it must be neutralized with liquid caustic soda before entering the rectification tower, so that the pH of the solvent re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/38
Inventor 田晓宏李维华严海华卫一龙
Owner SUZHOU JIAHUI CHEM
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