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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 tripolyphosphate, and there is no introduction on how to hydrolyze sodium tripolyphosphate into relatively pure disodium hydrogen phosphate or Sodium dihydrogen phosphate single product

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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