Method for preparing phosphorus fertilizer from liquid waste containing phosphate and phosphite ester

A phosphite and phosphate-containing technology, which is applied in the direction of phosphorous acid, ammonium orthophosphate fertilizer, chemical instruments and methods, etc., can solve the problem of waste liquid containing phosphite and orthophosphate, and the method of utilization has not been reported, phosphoric acid Difficult to recycle ester phosphite waste liquid, difficulty in phosphate ester and phosphite waste liquid, etc., to achieve the effect of high added value, good economical practicability, and high recovery rate

Inactive Publication Date: 2017-06-13
ZHEJIANG XINHUA CHEM
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  • Claims
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AI Technical Summary

Problems solved by technology

[0002] At present, in actual industrial production, waste liquid containing phosphate and phosphite is mainly sent to hazardous chemical disposal units, and it is difficult to reflect the value of resource utilization; Environmental pollution, the most thorough treatment method is incineration, but incineration requires expensive incinerators and phosphate purification devices and sales
These bring difficulties to the recycling of phosphate ester phosphite waste liquid
[0003] Since the waste liquid contains 22-26% of phosphite and 24-26% of orthop

Method used

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  • Method for preparing phosphorus fertilizer from liquid waste containing phosphate and phosphite ester

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Experimental program
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Effect test

Embodiment 1

[0025] Add 400 grams of waste liquid containing 24.55% of phosphoric acid ester and 25.62% of phosphite ester into the beaker. After the temperature is raised to 95°C, add 400 grams of concentrated hydrochloric acid to adjust the pH value to 1.5. Speed ​​300rpm, phosphoric acid ester and phosphite ester decompose alkyl to generate phosphoric acid and phosphorous acid respectively, the reaction is as follows:

[0026]

[0027] After the reaction, cool down and vacuum filter after standing for 16 hours. The evaporated hydrogen chloride and alcohol are treated by water spraying and absorption. When the filtrate is warmed up to 85°C, neutralize with potassium hydroxide solution and adjust the pH value of the solution to 4 under stirring conditions, and continue to stir and react for 1.0h under this condition, phosphoric acid and phosphorous acid will further produce potassium dihydrogen phosphate and diphosphorous acid The hydrogen potassium reaction is as follows:

[0028] h ...

Embodiment 2

[0032] Add 400 grams of waste liquid containing 24.55% of phosphoric acid ester and 25.62% of phosphite ester into the beaker. After heating up to 95°C, add 400 grams of concentrated hydrochloric acid to adjust the pH value to 2. Stir and react at a constant temperature of 95°C for 4.0 hours, then cool , vacuum filtration after standing for 18h. When the filtrate is heated up to 85°C, neutralize with sodium carbonate solution under stirring conditions and adjust the pH value of the solution to 5, continue stirring and reacting for 1.0h under this condition, after the reaction is completed, the solution is concentrated by vacuum evaporation to a solution volume of After 180 grams, cool and crystallize, separate, and dry to 425 grams of disodium hydrogen phosphate product. The separated mother liquor was concentrated by vacuum evaporation twice, crystallized by cooling, and dried to 328 grams of disodium hydrogen phosphite product. After analyzing the product, the disodium hydr...

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Abstract

The invention relates to a method for preparing phosphate fertilizer from waste liquid containing phosphoric acid ester and phosphite. The steps are as follows: S1) decompose the alkyl group in the waste liquid containing phosphoric acid ester and phosphorous acid ester under acidic conditions; S2) pass the solution obtained in S1 through alkali or carbonate neutralization; S3) evaporating the solution obtained in S2 for the first time and separating phosphate by cooling crystallization; S4) evaporating the solution obtained in S3 for the second time and separating phosphite by cooling crystallization. The invention provides a waste liquid utilization method with easy operation, safety, high phosphorus recovery rate and comprehensive waste utilization.

Description

technical field [0001] The invention relates to the utilization of industrial waste liquid in the chemical industry, in particular to a method for preparing phosphate fertilizer from waste liquid containing phosphate and phosphite. Background technique [0002] At present, in actual industrial production, waste liquid containing phosphate and phosphite is mainly sent to hazardous chemical disposal units, and it is difficult to reflect the value of resource utilization; Environmental pollution, the most thorough treatment method is incineration, but incineration requires expensive incinerators and phosphate purification devices and sales. These bring difficulties to the recycling of phosphoric acid ester phosphite waste liquid. [0003] Since the waste liquid contains 22-26% of phosphite and 24-26% of orthophosphate, if it is not effectively utilized, it will not only cause waste of phosphorus resources, but also cause serious environmental pollution. Therefore, the research...

Claims

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Application Information

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IPC IPC(8): C01B25/163C01B25/26C01B25/30C05B7/00C05B17/00
CPCC01B25/163C01B25/26C01B25/30C05B7/00C05B17/00
Inventor 阿锡他应思斌徐利红徐东涂利根朱玉成王昶严新华李坤章震王晓明
Owner ZHEJIANG XINHUA CHEM
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