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Comprehensive processing method of N-phosphonomethyliminodiacelic acid mother liquor

A comprehensive treatment, bis-glyphosate technology, applied in the field of comprehensive treatment of mother liquor containing sodium chloride, can solve the problems of environmental pollution, waste of resources, and insufficient comprehensiveness, and achieve the effect of low energy consumption and high degree of automation

Active Publication Date: 2009-01-21
JIANGSU YANGNONG CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current production process, it is difficult to deal with this kind of mother liquor. Treating mother liquor as wastewater not only wastes resources, but also pollutes the environment.
[0006] For the above mother liquor, many people have done recycling research, but they are not comprehensive enough.
The publication number is that in the patent application of CN1422275A and CN1837105A, only the sodium chloride in the waste water is recycled, and the bis-glyphosate is not utilized; the bis-glyphosate in the waste water is reclaimed and utilized in the patent application of the publication number CN101041527A, but the waste water is not treated. Comprehensive and comprehensive treatment

Method used

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  • Comprehensive processing method of N-phosphonomethyliminodiacelic acid mother liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1000 kg of mother liquor containing 1% diglyphosate and 16% sodium chloride produced in the production process of diglyphosate was pretreated with a precision filter device to remove impurities and colloids.

[0025] The pretreated mother liquor enters the nanofiltration system and is divided into two sections. The thick side is 96kg of concentrated liquid rich in diglyphosate, of which the concentration of diglyphosate reaches 9.5%, and sodium chloride is 17.3%. Phosphine 0.04%, sodium chloride 15.8%, operating pressure 3.0Mpa.

[0026] The dope with a diglyphosate concentration of 9.5% is fed into the diglyphosate synthesis system to recover the diglyphosate.

[0027] The effluent from the light side of the above-mentioned nanofiltration system enters the five-effect evaporator, the operating pressure of the series process is -0.05~0.15MPa, the steamed water directly enters the biochemical system, and the concentrated solution is centrifuged to obtain crude sodium chl...

Embodiment 2

[0032] Get the thick sodium chloride that obtains according to the embodiment 1 method, wherein contain sodium chloride 97.1%, total organic carbon 150ppm, total phosphorus 450ppm, total nitrogen 360ppm.

[0033] After the above crude sodium chloride was incubated at 1100° C. for 2 hours, the sodium chloride content was 98.1%, the total organic carbon was 6 ppm, the total phosphorus was 416 ppm, and the total nitrogen was 18 ppm.

[0034] Add water to dissolve the roasted sodium chloride and prepare salt water to make the sodium chloride content reach 20%, adjust pH=10.5 with 10% sodium hydroxide, add calcium chloride with 2.0% weight of salt water, and keep warm for 2.0hr at 20-30°C At the end of the heat preservation, add 0.5% PAM polymer flocculant by weight of brine, continue stirring for 0.5 hr, and filter and separate. The filtrate contains 0.8 ppm of total phosphorus, 0.6 ppm of organic carbon, and 1.6 ppm of total nitrogen.

[0035] After the above steps, the refined b...

Embodiment 3

[0037] Get the thick sodium chloride that obtains according to the embodiment 1 method, wherein contain sodium chloride 97.1%, total organic carbon 150ppm, total phosphorus 450ppm, total nitrogen 360ppm.

[0038] After the above crude sodium chloride was incubated at 1100° C. for 2 hours, the sodium chloride content was 98.1%, the total organic carbon was 6 ppm, the total phosphorus was 416 ppm, and the total nitrogen was 18 ppm.

[0039] Add water to dissolve the thick sodium chloride after the above-mentioned roasting and prepare salt water, so that the sodium chloride content reaches 20%, adjust the pH=10.5 with 10% sodium hydroxide, add magnesium chloride with 1.5% weight of salt water, and keep the temperature at 20-30°C for 4.0hr. At the end of the heat preservation, add 0.3% PAM polymer flocculant by weight of brine, continue stirring for 1 hr, filter and separate, and the filtrate contains 1.1 ppm of total phosphorus, 0.7 ppm of organic carbon, and 2.4 ppm of total nitr...

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Abstract

The invention relates to a process for comprehensively treating a mother liquor containing sodium chloride, obtained by the synthesis of an IDA line n-(phosphonomethyl)iminodiacetic acid. The treated sodium chloride meet the quality requirement for producing caustic soda by electrolysis, in particular, the concrete treatment steps comprises: an n-(phosphonomethyl)iminodiacetic acid, an n-(phosphonomethyl)iminodiacetic acid homolog and a dense liquid richly concentrated on the inner side of the film of the sodium filtration film condensed mother liquor are used to recover the n-(phosphonomethyl)iminodiacetic acid, and coarse sodium chloride is obtained by the dehydration crystallization of a weak liquor; the coarse sodium chloride is treated to obtain refined sodium chloride which can be directly used for producing caustic soda by electrolysis. By the comprehensive treatment method of the invention, the n-(phosphonomethyl)iminodiacetic acid of the n-(phosphonomethyl)iminodiacetic acid mother liquor can be effectively recovered, the by-product sodium chloride in the waste water can be fully utilized, thereby thoroughly meeting the requirements on economy, energy conservation and environmental protection.

Description

technical field [0001] The invention relates to a method for treating pesticide mother liquor, in particular to a comprehensive treatment method for mother liquor containing sodium chloride obtained by synthesizing diglyphosate through the IDA route. Background technique [0002] Glyphosate is a widely used organic phosphine herbicide, which has the characteristics of high efficiency, broad spectrum, low toxicity and safety, and is very effective in the control of perennial deep-rooted weeds. As a high-efficiency, low-toxicity, and destructive herbicide, glyphosate has been used for more than 25 years. In recent years, due to the large-scale promotion of glyphosate-resistant transgenic crops, making its application more convenient, the market demand for glyphosate has grown rapidly, and it has continuously replaced other types of herbicides. It has occupied the first place in the world's pesticide sales for many years. [0003] There are two main production methods of glyph...

Claims

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Application Information

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IPC IPC(8): C01D3/14C25B1/16C07F9/38
CPCY02P20/10
Inventor 何红军熊苏义姜友法孔勇王宝林
Owner JIANGSU YANGNONG CHEM
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