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Method for treating N-phosphonomethyliminodiacetic acid mother liquor

A treatment method, the technology of bisglyphosate mother, applied in the field of intermediate or tail liquid treatment, can solve the problems of poor economy and environmental protection, no simultaneous separation and utilization, etc., to save resource consumption, reduce waste water discharge, The effect of good economic benefits

Inactive Publication Date: 2017-04-26
NANTONG JIANGSHAN AGROCHEM & CHEM LIMITED LIABILITY
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  • Abstract
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  • Claims
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Problems solved by technology

The inventive method can only recover the bisglyphosate in the mother liquor, a large amount of salts are not separated and utilized at the same time, and the economy and environmental protection are not good.

Method used

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  • Method for treating N-phosphonomethyliminodiacetic acid mother liquor

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Embodiment 1

[0020] use as figure 1 Processing steps shown:

[0021] First take 105g of iminodiacetonitrile and add 416g (wt) 20% sodium hydroxide solution to carry out alkaline hydrolysis deamination, after the completion, add about 115g (wt) 31% hydrochloric acid, heat up distillation, separate the water, filter to obtain 560g of filtrate. Add phosphorous acid and formaldehyde to condense, (the molar ratio of materials is IDA:phosphorous acid:formaldehyde=1:1.1:1.2) After the heat preservation is over, add 300g of bottom water, add alkali to adjust pH=0.5, and obtain 212g of diglyphosate solid after crystallization , Obtain 850g of bis-glyphosate mother liquor.

[0022] Next, take 150 g of the mother liquor of bisglyphosate (taken from 850 g) and pass through HCl to obtain about 115 g of the mother liquor of salting out and about 37 g of salt (NaCl content 98%).

[0023] Then, get 105g of iminodiacetonitrile and add 416g (wt) 20% sodium hydroxide solution to carry out alkaline hydrolys...

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Abstract

The invention discloses a method for treating an N-phosphonomethyliminodiacetic acid mother liquor. The method is as below: taking one part of the N-phosphonomethyliminodiacetic acid mother liquor as a salting-out mother liquor for by-product HCl tail gas from phosphorous acid production, performing salting out by the common ion effect of chloride ions and recovering sodium chloride; and using the salting-out residual mother liquor as an acid for an acidification reaction after alkaline hydrolysis of iminodiacetonitrile in the synthesis process of N-phosphonomethyliminodiacetic acid; and then taking the other part of the N-phosphonomethyliminodiacetic acid mother liquor as diluting water used in a condensation reaction. The method makes full use of the N-phosphonomethyliminodiacetic acid mother liquor formed after the synthesis of N-phosphonomethyliminodiacetic acid, and the N-phosphonomethyliminodiacetic acid mother liquor can be used as part of raw materials for a plurality of chemical reactions, and the method has the advantages of cost reduction and green environmental protection.

Description

technical field [0001] The invention relates to a treatment technology for an intermediate or tail liquid of glyphosate synthesis. Background technique [0002] Glyphosate (N-phosphonomethylglycine) is a high-efficiency, low-toxicity, and safe organic phosphine herbicide. It is very effective in the control of perennial vicious weeds and is one of the most widely used herbicides at present. During the production of glyphosate, the intermediate diglyphosate will be used, and a large amount of mother liquor will be generated in the production of diglyphosate. [0003] The synthesis process of bisglyphosate: add alkali to the reaction kettle, add iminodiacetonitrile for alkali hydrolysis; after alkali hydrolysis, add acid for acidification reaction (add phosphorous acid and hydrochloric acid to it in a certain proportion), and obtain iminodiacetic acid sodium salt , under the condition of diluting with water and refluxing, slowly add a certain amount of formaldehyde to carry o...

Claims

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Application Information

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IPC IPC(8): C07F9/38C01D3/14
CPCC07F9/3808C01D3/14
Inventor 石进董垒孙亚峰王建清蒋士猛
Owner NANTONG JIANGSHAN AGROCHEM & CHEM LIMITED LIABILITY
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