Method for producing orthophosphate products from polyphosphates through hydrolysis

A technology of condensing phosphate and orthophosphate, applied in the direction of phosphate, phosphorus oxyacid, etc., can solve problems such as hydrolysis of sodium tripolyphosphate not introduced

Active Publication Date: 2014-02-12
ZHEJIANG XINAN CHEM INDAL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The sodium tripolyphosphate hydrolyzates reported in the literature all exist in the form of mixtures, and the research direction is to try to inhibit the hydrolysis of sodium t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 Get 100kg of 92% sodium pyrophosphate decahydrate, 9-11kg of 85% phosphoric acid, and 50kg of water, mix them in a reactor with a stirrer, and adjust the pH value at 6-7 by phosphoric acid, and heat up the reaction. The reaction temperature is 120~135℃, the reaction pressure is about 0.2MPa, and the reaction time is 180min, so as to obtain a mixture of sodium dihydrogen phosphate and disodium hydrogen phosphate; then add about 104kg of water and 87.5kg of 30% liquid caustic soda to the hydrolyzate to adjust the solution pH = 11-12, heat preservation reaction at 85°C for 0.5h, then cool down to crystallize. The concentration of trisodium phosphate in the crystallization solution is about 23.4%. When the temperature of the crystallization solution drops to 48-52°C, add 3kg of seed crystals to the crystallization solution, stir slowly, and keep the temperature for 20 minutes, then control the cooling rate to 2°C / h slowly. Cool down to below 30°C, the cooling c...

Embodiment 2

[0034] Example 2 Take 100kg of 92% sodium pyrophosphate decahydrate, 45-50kg of 85% phosphoric acid solution, and 50kg of water, mix them in a reaction kettle with a stirrer, and adjust the pH value at 4-5 by phosphoric acid, heat up the reaction, and the reaction temperature The temperature is 110-120°C, the reaction pressure is about 0.1 MPa, and the reaction time is 180 minutes, so as to obtain a sodium dihydrogen phosphate solution, which is then cooled to crystallize. Adjust the pH of the crystallization solution to 4-4.5, and the concentration of sodium dihydrogen phosphate is about 50%. When the crystallization solution drops to about 30°C, add 5kg of seed crystals to crystallize, control the cooling rate to 2°C / h, slowly cool down to 0°C, and crystallize At the end, more than 98% of sodium dihydrogen phosphate dihydrate crystal product can be obtained by filtration, or the crystal water can be removed by continuing to dry at 100°C to obtain anhydrous sodium dihydrogen p...

Embodiment 3

[0035]Example 3 Take 100kg of 92% sodium pyrophosphate decahydrate and about 50kg of water for mixing, react under high temperature and high pressure conditions for 120min, the reaction temperature is 140-150°C, and the pressure is 0.2-0.5MPa, thereby obtaining a hydrolysis solution, the concentration of disodium hydrogen phosphate About 38%, then cool down to crystallize, add 4kg seed crystals when it drops to 41-42°C, and slowly cool down to below 25°C, after the crystallization is over, filter to get the crystal product of disodium hydrogen phosphate dodecahydrate, or Continue drying at 100°C to remove crystal water and obtain anhydrous disodium hydrogen phosphate product.

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Abstract

The invention mainly discloses a method for preparing orthophosphates from polyphosphates, and in particular relates to a method for preparing orthophosphate products from an orthophosphate-containing material recycled from phosphorus wastes as the raw material through hydrolysis.

Description

technical field [0001] The present invention relates to the hydrolysis of condensed phosphate, more specifically, relate to a kind of hydrolyzing pyrophosphate, tripolyphosphate, metaphosphate and the phosphate etc. of higher degree of polymerization into orthophosphate (comprising MH 2 PO 4 ,M 2 HPO 4 ,M 3 PO 4 ) method of the product. Background technique [0002] With the development and continuous maturity of phosphorus-containing wastewater resource recovery and utilization technology, a large number of phosphate products, especially various condensed phosphoric acids, are formed through the recovery of phosphorus elements in high-phosphorus pesticide production waste and phosphorus chemical industry high-phosphorus wastewater Salt products. "A method for treating phosphorus-containing waste from pesticide production and products obtained by the method" (application number: 201110310586.8) filed by the applicant discloses the use of high-temperature oxidation tech...

Claims

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Application Information

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IPC IPC(8): C01B25/26
Inventor 王伟周曙光秦龙陈静詹波黄鑫张海良佘慧玲祝小红
Owner ZHEJIANG XINAN CHEM INDAL GROUP
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