Process for preparing disodium hydrogen phosphate from glyphosate mother liquor

A technology of glyphosate mother liquor and disodium hydrogen phosphate, applied in phosphorus compounds, inorganic chemistry, non-metallic elements, etc., can solve problems such as high biological toxicity, high phosphorus content, and difficult treatment

Active Publication Date: 2014-06-18
杭州深瑞净水技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Glyphosate mother liquor has the characteristics of high COD, high phosphorus content, refractory degradation, and high biological toxicity. It is difficult to process and

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] This embodiment takes the glyphosate alkaline mother liquor produced by the glycine route process as an example. For example, the water quality of glyphosate mother liquor wastewater produced by a certain factory is as follows: pH is 10.3, COD is 61000 mg / L, total phosphorus is 24200 mg / L, total nitrogen is 5300 mg / L, sodium chloride is 180 g / L, density It is 1.2 tons / cubic meter. A set of air wet oxidation device with a processing capacity of 2.5 tons of mother liquor / hour is used for continuous oxidation treatment. The reaction temperature is 260 degrees, the reaction pressure is 7.0Mpa, and the air supply is 10.0 cubic meters (standard condition) / minute. The mother liquor is reacting The reaction residence time in the vessel was 30 minutes. After 72 hours of stable operation of the device, the oxidation solution obtained after treatment was sampled and analyzed to obtain the following water quality parameters: pH 8.5, phosphate content 17300 mg / L, COD 21300 mg / L. C...

Embodiment 2

[0017] Adopt the glyphosate mother liquor of identical water quality with embodiment 1 in the present embodiment. A set of air wet oxidation device with a processing capacity of 2.5 tons of mother liquor / hour is used for continuous oxidation treatment. The reaction temperature is 275 degrees, the reaction pressure is 8.3Mpa, and the air supply is 10.0 cubic meters (standard condition) / minute. The mother liquor is reacting The reaction residence time in the vessel was 30 minutes. After 72 hours of stable operation of the device, the obtained oxidation solution was sampled and analyzed to obtain the following water quality parameters: pH 7.9, phosphate content 21200 mg / L, COD 17500 mg / L. Cool 50 tons of the oxidizing solution to 5°C, crystallize for 4 hours, and then centrifugally filter to obtain 12.2 tons of crude disodium hydrogen phosphate dodecahydrate crystals.

Embodiment 3

[0019] Adopt the glyphosate mother liquor of identical water quality with embodiment 1 in the present embodiment. A set of air wet oxidation device with a processing capacity of 2.5 tons of mother liquor / hour is used for continuous oxidation treatment. The reaction temperature is 290 degrees, the reaction pressure is 9.9 Mpa, and the air supply is 10.0 cubic meters (standard condition) / minute. The mother liquor is reacting The reaction residence time in the vessel was 30 minutes. After 72 hours of stable operation of the device, the following water quality parameters were obtained by sampling and analyzing the oxidation solution obtained after treatment: pH 7.7, phosphate content 22100 mg / L, COD 12500 mg / L. Cool 50 tons of the oxidizing solution to 3°C, crystallize for 4 hours, and then centrifugally filter to obtain 13.2 tons of crude disodium hydrogen phosphate dodecahydrate crystals. The oxidized solution after centrifugal filtration is concentrated by nanofiltration membr...

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Abstract

The invention relates to a process for preparing disodium hydrogen phosphate from a glyphosate mother liquor. The process comprises an oxidization step, a crystallization step and a separation step, wherein the oxidization step comprises oxidizing organic phosphorus compounds and phosphorous acid in the glyphosate mother liquor wastewater into positive phosphate ions under the reaction conditions of a temperature ranging from 240 to 320 DEG C and pressure ranging from 6.0 to 15.0 Mpa by taking the oxygen in the air as an oxidizing agent, wherein the oxygen supply amount is 0.7 to 1.3 times of the total amount of COD (Chemical Oxygen Demand) of the glyphosate mother liquor; the crystallization step comprises cooling the oxidized liquid obtained in the oxidization step to the range from minus 5 to 12 DEG C and generating solid-state disodium hydrogen phosphate dodecahydrate crystals under the condition that pH ranges from 7.0 to 10.5; the separation step comprises performing solid-liquid separation on the oxidized liquid crystallized in the crystallization step.

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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Application Information

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IPC IPC(8): C01B25/30
Inventor 袁志文
Owner 杭州深瑞净水技术有限公司
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