Method for nanofiltration separation and comprehensive utilization of glyphosate mother liquor

A technology of glyphosate mother liquor and glyphosate, which is applied in the fields of chemical engineering and environmental engineering, can solve problems such as water and soil environmental pollution, and achieve the effects of ensuring smooth progress, improving comprehensive competitiveness, major economic benefits and environmental protection benefits

Inactive Publication Date: 2009-12-09
WUHAN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to adopt appropriate technical measures to separate and treat glyphosate wastewater with high content of sodium chlor

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  • Method for nanofiltration separation and comprehensive utilization of glyphosate mother liquor

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[0014] The process flow of the three-stage nanofiltration separation of glyphosate wastewater of the present invention is shown in FIG. 1. The glyphosate waste water in the glyphosate waste water tank 1 first exchanges heat with the separated sodium chloride solution in the heat exchanger 2 to cool the glyphosate waste water with a higher temperature to adapt to the water inflow of the nanofiltration membrane. At the same time, the temperature of the sodium chloride aqueous solution is increased, which is conducive to the oxidation-reduction reaction in the sodium chloride solution; the cooled glyphosate wastewater passes through a pre-filter 3 (bag filter or bag filter) with a pore size of 5μm. Tubular filter), to remove suspended solids and particulate matter, the filter effluent enters the nanofiltration membrane system; each level of the nanofiltration system adopts nanofiltration membranes that can cut off glyphosate with a molecular weight of 169; the filter effluent first e...

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Abstract

The invention discloses a method which is suitable for the separation and the comprehensive utilization of components of glyphosate mother liquor. The method adopts three-stage nanofiltration separation glyphosate mother liquor, the concentrated water side of a nanofiltration membrane is provided with glyphosate concentrated liquor, and percolate of the nanofiltration membrane is concentrated sodium chloride solution. First stage nanofiltration concentrated liquor is diluted by water and then is led into a second stage nanofiltration; and second stage nanofiltration concentrated liquor is diluted by water and then is led into a third stage nanofiltration. The glyphosate solution concentrated by the three-stage nanofiltration is recycled to be used as water for rinsing products. The concentrated sodium chloride solution which is processed by three-stage nanofiltration permeation contains micromolecule organic matters and is processed by the photocatalysis-chemical oxidation method to obtain brine to be used as a raw material for producing sodium hudroxide. The method carries out the operation of three-stage nanofiltration separation and photocatalysis-chemical oxidation on the glyphosate mother liquor, can realize the zero release comprehensive utilization of the glyphosate mother liquor, and has outstanding economic and environmentally friendly benefits.

Description

technical field [0001] The invention specifically relates to a method for nanofiltration separation and comprehensive utilization of glyphosate wastewater, which belongs to the technical field of environmental engineering and also belongs to the technical field of chemical engineering. Background technique [0002] Glyphosate is a high-efficiency and low-toxic herbicide, and it is a special phosphorus chemical product with high price and high demand. Due to its promising market prospects and high profits, within a few years, the number of domestic manufacturers has rapidly grown to more than 3,000. However, the glyphosate mother liquor, the process wastewater discharged from the glyphosate production process, has the characteristics of high salt content, high concentration of organic matter, and high density. For this kind of wastewater, there is no effective treatment method at present. Once discharged, it will cause serious pollution to water and soil, and cause serious d...

Claims

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Application Information

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IPC IPC(8): C07F9/38C01D3/06C02F1/44A01N57/20A01P13/00
Inventor 叶春松阳红钱勤邓佳杰佟立辉余菲叶金华
Owner WUHAN UNIV
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