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Method for continuously adjusting pH value of dilute aqueous agent in glyphosate production process

A production process, glyphosate technology, applied in the directions of plant growth regulators, chemical instruments and methods, biocides, etc., can solve the problems of restricting the continuity of the process, increasing labor costs, increasing labor costs, etc., to achieve stability. , Improve mixing effect and save labor cost

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

Problems solved by technology

[0004] (2) The pH value in the process is measured by an online pH meter, but when it is close to the end point of the pH value, it is necessary to repeatedly add dilute water or hydrochloric acid to make the pH value reach between 7-8, which brings certain difficulties to production management. The cumbersomeness also increases the labor cost
[0005] The above 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

[0023] (1) Utilize the distributed control system (DCS system) according to pH=7, control the flow meter and the regulating valve to preliminarily carry out the proportioning of dilute water agent and hydrochloric acid, and then import the static mixer for mixing to obtain the mixed solution;

[0024] (2) After the mixed solution comes out of the static mixer, it is continuously neutralized through the first-stage neutralization tank. Due to the recovery of the triethylamine process, the concentration of liquid alkali in the dilute water agent is too high, and the pH meter measures the flow out of the first stage. The pH value of the material in the neutralization tank is too high, and the mixed solvent flows from the first-level neutralization tank into the second-level neutralization tank through the potential difference, and the DCS automatically increases the flow rate of hydrochloric acid through the set ratio adjustment plan to continue neutralization , to obtain a qualif...

Embodiment 2

[0026] (1) Utilize the distributed control system (DCS system) according to pH=8, control the flow meter and the regulating valve to preliminarily carry out the proportioning of dilute water agent and hydrochloric acid, and then import it into a static mixer for mixing to obtain a mixed solution;

[0027] (2) After the mixed solution comes out of the static mixer, it is continuously neutralized through the first-stage neutralization tank. Due to the recovery of triethylamine, the concentration of liquid alkali in the dilute water agent is too low, and the pH meter measures the flow out of the first stage. The pH value of the material in the neutralization tank 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 automatically reduces the flow rate of hydrochloric acid through the set ratio adjustment plan to continue neutralization , to obtain a qualified solution wit...

Embodiment 3

[0029] (1) Utilize 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 dilute water agent and hydrochloric acid, then import the static mixer to mix, and obtain the mixed solution;

[0030] (2) After the mixed solution comes out of the static mixer, it is continuously neutralized through the first-stage neutralization tank. Due to the low content of hydrochloric acid in this batch of raw materials, the pH meter measures the pH value of the material flowing out of the first-level neutralization tank. , the mixed solvent flows from the first-level neutralization tank into the second-level neutralization tank through the potential difference, and the DCS automatically increases the flow rate of hydrochloric acid through the set ratio adjustment scheme, and continues neutralization to obtain a qualified solution with pH=9.

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Abstract

The invention relates to a method for continuously adjusting a pH value of a dilute aqueous agent in a glyphosate production process. The method comprises the following steps of: (1) guiding hydrochloric acid and the dilute aqueous agent after reclaiming triethylamine into a static mixer, and mixing the hydrochloric acid and the dilute aqueous agent to obtain a mixed solvent; and (2) after the mixed solvent is discharged from the static mixer, performing continuous neutralization through a two-stage neutralization kettle to obtain solution with qualified pH value. Compared with the prior art, the method can measure the pH value on line, controls the proportion of the dilute aqueous agent and the hydrochloric acid by using signals of the pH value through a flow meter and an adjusting valve, solves the problem of solvent neutralization continuity of factory production, improves the mixing effect, and improves the process stability.

Description

technical field [0001] The invention relates to a method for adjusting the pH value, in particular to a method for continuously adjusting the pH value of the diluent in the production process of glyphosate. Background technique [0002] In the production process of glycine-fat glyphosate, the glyphosate crystallization mother liquor becomes dilute water solution after recovering triethylamine, and the diluent water solution can be adjusted into 10% water solution after being concentrated. During this process, since the dilute water agent is strongly alkaline, it must be neutralized with hydrochloric acid before entering the thickening tank, so that the pH value of the dilute water agent can reach 7-8, so that the concentrated salt product can be qualified. The traditional process of adjusting the pH value of the dilute water agent is to adjust the pH value by switching between two diluent water agent pH adjustment kettles, that is, one kettle is fed with the water dilute age...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/38A01N57/20G05D21/00
Inventor 田晓宏李维华卫一龙曹永元
Owner SUZHOU JIAHUI CHEM
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