Method for preparing potassium dihydrogen phosphite

A technology of potassium dihydrogen phosphite and phosphorous acid, which is applied in the chemical industry, can solve the problems of long reaction time and the need for crystallization process of potassium dihydrogen phosphite, achieve short reaction time, improve storability and transportability, and simplify production Process effect

Inactive Publication Date: 2017-05-17
四川新磷环保技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this production method has a long reaction time and produces CO 2 and the n

Method used

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  • Method for preparing potassium dihydrogen phosphite

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Embodiment 1

[0035] use as figure 1 Shown the method of the present invention, with 10870t 85% solid potassium hydroxide, take ethanol as solvent (recycling) to obtain potassium hydroxide alcoholic solution through alcohol dissolving, then neutralize reaction with 13736t98.5% solid phosphorous acid, The solution concentration of potassium hydroxide alcohol is 20g / 100g. The molar ratio of potassium hydroxide alcoholic solution and phosphorous acid used for neutralization reaction between potassium hydroxide and phosphorous acid is 1:1.04; 2 hours; neutralization reaction terminal pH value is 4.5. The material after the neutralization reaction is subjected to solid-liquid separation and drying to obtain potassium dihydrogen phosphite. After testing, the purity of the potassium dihydrogen phosphite obtained after drying reaches more than 99 wt%. The liquid obtained after solid-liquid separation is rectified to recover alcohol, and the obtained alcohol is used as potassium hydroxide alcohol...

Embodiment 2

[0038] use as figure 1Shown the inventive method, with 5435t 85% solid potassium hydroxide, take ethanol as solvent (recycling) to obtain potassium hydroxide alcoholic solution through alcohol dissolution, then neutralize reaction with 6868t98.5% solid phosphorous acid, The solution concentration of potassium hydroxide alcohol is 20g / 100g. The molar ratio of potassium hydroxide alcoholic solution and phosphorous acid used for neutralization reaction between potassium hydroxide and phosphorous acid is 1:1.04; 3 hours; neutralization reaction terminal pH value is 4.4. The material after the neutralization reaction is subjected to solid-liquid separation and drying to obtain potassium dihydrogen phosphite. After testing, the purity of the potassium dihydrogen phosphite obtained after drying reaches more than 99 wt%. The liquid obtained after solid-liquid separation is rectified to recover alcohol, and the obtained alcohol is used as an alcohol solvent for potassium hydroxide f...

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Abstract

The invention provides a method for preparing potassium dihydrogen phosphite. The method comprises the following steps: solid potassium hydroxide is dissolved in an alcohol solvent, solid phosphorous acid is added, the materials are subjected to neutralization, a product is subjected to solid-liquid separation, and high-purity potassium dihydrogen phosphite is prepared after drying, wherein alcohol is recovered from a liquid obtained after solid-liquid separation through distillation, the recovered alcohol is recycled, and distilled mother liquor returns to neutralization for recycling. Crystallization of potassium dihydrogen phosphite is omitted by means of the difference between alcohol solubility and water solubility, high-purity potassium dihydrogen phosphite can be prepared, and production procedures are simplified; no wastewater, waste gas or solid waste is discharged, alcohol recycling is realized, and the effect of circulating and clean production is realized.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for preparing potassium dihydrogen phosphite by an alcohol solvent method. Background technique [0002] Potassium dihydrogen phosphite is a white crystal. It is an important fine inorganic salt product. It is easily soluble in water and can be used directly in industrial circulating water systems. It has the functions of sterilizing and complexing calcium and magnesium ions, and can replace organic phosphorus. Water treatment agent, reduce environmental pollution. In terms of pesticides, it is an important product integrating sterilization, insecticide and fertilizer. Potassium dihydrogen phosphite can be used as a bactericidal and disease-resistant agent for crops, or as a water treatment agent for killing green algae. Studies have shown that potassium dihydrogen phosphite can control soybean downy mildew and increase crop yield; foliar spraying of potatoes...

Claims

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Application Information

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IPC IPC(8): C01B25/163
CPCC01B25/163C01P2006/80
Inventor 罗宗恬黄钰雪杜星罗辉
Owner 四川新磷环保技术有限公司
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