Process for preparing disodium hydrogen phosphate from glyphosate

A technology of glyphosate mother liquor and disodium hydrogen phosphate, applied in phosphorus compounds, inorganic chemistry, non-metallic elements, etc., can solve the problems of high biological toxicity, high phosphorus content, and difficult treatment
CN103288065APending Publication Date: 2013-09-11浙江悦瑞环保工程有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
浙江悦瑞环保工程有限公司
Publication Date
2013-09-11
Patent Text Reader

Abstract

The invention relates to a process for preparing disodium hydrogen phosphate from glyphosate. The process comprises the following steps: oxidization step: first, adding an acid and adjusting a glyphosate mother liquor till the liquor is acidic; then, in the condition of temperature range from 180 to 280 DEG C and pressure range from 3.0 to 9.0MPa, oxidizing organic phosphorus compounds and phosphorous acid in the glyphosate mother liquor to orthophosphate ions by using oxygen in air as an oxidant under the catalysis of a heterogeneous noble metal catalyst; extraction step: adding oxidized wastewater into the extraction liquor for extraction; layering; dividing upper extraction liquor to an extraction liquor separation tank; and neutralizing step: kalifying to neutralize the upper extraction liquor; carrying out solid-liquid separation under a certain temperature condition to obtain a disodium hydrogen phosphate product to be marketed; and after refining the extraction liquor, returning and applying mechanically.
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Description

technical field

[0001] The invention relates to a process for preparing disodium hydrogen phosphate from the mother liquor produced in the glyphosate production process as a raw material. Background technique

[0002] Glyphosate (C 3 h 8 NO 5 P, CAS registration number 1071-83-6) is a high-efficiency, low-toxicity, broad-spectrum destructive systemic herbicide developed by Monsanto in the 1970s. Ranking first in sales, with the large-scale planting of transgenic glyphosate-resistant crops such as soybeans and corn in recent years, the global demand for glyphosate continues to increase.

[0003] At present, there are two mainstream production processes of glyphosate in China: the glycine method and the iminodiacetic acid method. In 2010, the glyphosate output in my country was around 350,000-400,000 tons, of which the glycine method accounted for 75% of the total production. about. The production process of both routes produces a large amount of highly concentrated wastew...

Claims

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