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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

Pending Publication Date: 2013-09-11
浙江悦瑞环保工程有限公司
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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 expensive to process.
If these phosphorus-containing wastewater is not properly treated, it will cause serious environmental pollution and promote eutrophication of water bodies.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] This embodiment takes the glyphosate alkaline mother liquor produced by the glycine route process as an example. For example, the quality of wastewater produced by a factory is as follows: pH is 10.3, COD is 61000 mg / L, total phosphorus is 24000 mg / L, total nitrogen is 5300 mg / L, sodium chloride is 180 g / L, and density is 1.2 tons / L cubic meter. After adding hydrochloric acid to adjust the pH to 2.5, a set of heterogeneous catalytic oxidation equipment with a processing capacity of 2.5 tons of mother liquor / hour is used for continuous oxidation treatment. The reaction temperature is 180 degrees, the reaction pressure is 3.0Mpa, and the air supply is 10.0 cubic meters m / min, the reaction residence time of the mother liquor in the reactor is 30 minutes. The oxidized wastewater is extracted (extractant is 70% tributyl phosphate + 30% kerosene) and then enters the next process; the extraction liquid containing inorganic phosphorus is neutralized to pH7.5 with sodium hydrox...

Embodiment 2

[0014] The water quality of glyphosate mother liquor in the present embodiment is identical with embodiment 1. After adding hydrochloric acid to adjust the pH to 4, a set of heterogeneous catalytic oxidation equipment with a processing capacity of 2.5 tons of mother liquor / hour is used for continuous oxidation treatment. The reaction temperature is 230 degrees, the reaction pressure is 5.0Mpa, and the air supply is 10.0 cubic meters per hour. Minutes, the reaction residence time of mother liquor in the reactor is 30 minutes. The oxidized wastewater is extracted (extractant is 80% tributyl phosphate + 20% kerosene) and then enters the next process. The extraction liquid containing inorganic phosphorus is neutralized to pH9.0 by adding sodium hydroxide, and a solid crude product of disodium hydrogen phosphate is generated at room temperature. The crude disodium hydrogen phosphate dodecahydrate crystal is washed once with pure water, centrifugally filtered, and the obtained crys...

Embodiment 3

[0016] The water quality of glyphosate mother liquor in the present embodiment is identical with embodiment 1. After adding hydrochloric acid to adjust the pH to 4.5, a set of heterogeneous catalytic oxidation equipment with a processing capacity of 2.5 tons of mother liquor / hour is used for continuous oxidation treatment. The reaction temperature is 250 degrees, the reaction pressure is 6.0Mpa, and the air supply is 10.0 cubic meters m / min, the reaction residence time of the mother liquor in the reactor is 30 minutes. The oxidized wastewater is extracted (extractant is 60% tributyl phosphate + 40% kerosene) and then enters the next process. The extraction liquid containing inorganic phosphorus is neutralized to pH 8.0 by adding sodium hydroxide, and a solid crude product of disodium hydrogen phosphate is generated at room temperature. The crude disodium hydrogen phosphate dodecahydrate crystal is washed once with pure water, centrifugally filtered, and the obtained crystal i...

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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.

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 浙江悦瑞环保工程有限公司
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