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Synthesis method of potassium dihydrogen phosphate

A technology of potassium dihydrogen phosphate and its synthesis method, which is applied in the field of synthesizing potassium dihydrogen phosphate from condensed phosphate

Inactive Publication Date: 2015-05-06
ZHEJIANG XINAN CHEM INDAL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The patents and documents on the preparation of potassium dihydrogen phosphate with condensed phosphate as the starting material have not yet been reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]①Dissolve 36kg of crude sodium pyrophosphate, 34kg of sodium tripolyphosphate and 29kg of sodium hexametaphosphate obtained after comprehensive treatment of phosphorus-containing pesticide production waste liquid in 390kg of water, heat up to 60°C, add 10kg of hydrogen peroxide, and Incubate at 60°C for 15 minutes. Add 5kg of activated carbon, then adjust the pH to 12.0 with liquid caustic soda, continue to heat up to 90°C, and keep warm for 1h. Then the feed liquid is first filtered with a precision microporous filter, then passed through a purifier equipped with an ion exchange resin packed column, and finally enters the hydrolysis kettle. Sampling and analysis showed that the COD of the feed liquid entering the hydrolysis tank was 2ppm, the water insoluble matter was less than 0.01%, and the metal ion content was 1.4ppm. ②Add 103kg of 98% potassium chloride and 74kg of 85% phosphoric acid to the hydrolysis kettle, adjust the pH of the seasoning solution to 4.0, then ...

Embodiment 2

[0037] ①Dissolve 109kg of crude sodium pyrophosphate (the content of sodium pyrophosphate is 85%) obtained after comprehensive treatment of phosphorus-containing pesticide production waste liquid into 388kg of water, heat up to 60°C, add 2kg of sodium chlorate, and keep warm at 60°C 30min. Continue to heat up to 90°C and keep warm for 1h. Then the feed liquid is first filtered with a precision microporous filter, and finally enters the hydrolysis tank. Sampling and analysis showed that the COD of the feed liquid entering the hydrolysis tank was 2ppm, the water insoluble matter was less than 0.01%, and the metal ion content was 1.4ppm. ②Add 103kg of 98% potassium chloride and 74kg of 85% phosphoric acid to the hydrolysis kettle, adjust the pH of the seasoning solution to 4.0, then raise the temperature to 100-105°C, and keep it under normal pressure for 4 hours. ③ Cool the feed liquid to 55-65°C, add 30Kg potassium dihydrogen phosphate seed crystals, stir and keep warm for 15...

Embodiment 3

[0039] ① Dissolve 103 kg of crude sodium tripolyphosphate (with a sodium tripolyphosphate content of 92%) obtained after comprehensive treatment of phosphorus-containing pesticide production waste liquid in 385 kg of water. Add 1 kg of diatomaceous earth, then use liquid caustic soda to season the pH to 11.5, continue to heat up to 90°C, and keep warm for 1h. Then the feed liquid is first filtered with a diaphragm plate and frame filter, then passed through a packed column purifier equipped with ion exchange resin, and finally enters the hydrolysis tank. Sampling analysis shows that the COD of the feed liquid entering the hydrolysis tank is 2ppm, the water insoluble matter is <0.01%, and the metal ion content is 1.0ppm. ②Add 74kg of 85% phosphoric acid and 103kg of 98% potassium chloride to the hydrolysis kettle, adjust the pH of the seasoning solution to 4.0, then raise the temperature to 120-130°C, and keep it sealed for 2 hours. ③ Cool the feed liquid to 55-65°C, add 30Kg ...

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Abstract

The invention provides a synthesis method of potassium dihydrogen phosphate. According to the method, a polyphosphate is taken as the raw material, and finally, the high-quality potassium dihydrogen phosphate can be obtained by use of the steps of hydrolytic synthesis, crystallization and separation. When the raw material is phosphorus-containing liquid waste, in particular a polyphosphate solid product obtained by performing comprehensive treatment on phosphorus-containing pesticide production liquid waste, the hydrolytic synthesis should be performed after pretreatment. The invention also provides a treatment method for recycling a potassium dihydrogen phosphate mother liquor and salt wash water; as a result, no liquid waste is generated in the process and the whole process is a clean process.

Description

technical field [0001] The invention relates to a method for synthesizing potassium dihydrogen phosphate with polycondensed phosphate. Specifically, it is a method for preparing industrial grade potassium dihydrogen phosphate by using pyrophosphate, tripolyphosphate, metaphosphate and phosphate with a higher degree of polymerization as raw materials. Background technique [0002] In recent years, with the development and continuous maturity of phosphorus-containing wastewater recycling technology, a large number of phosphate products have been formed, especially various A condensed phosphate product. "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 technology to treat phosphorus-containing pesticide waste and convert it into pyrophosphate and polyphosphoric acid Salt, metaphosphate and orthophosphate an...

Claims

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Application Information

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IPC IPC(8): C01B25/30
Inventor 朱建民黄鑫王昌洪刘春杰
Owner ZHEJIANG XINAN CHEM INDAL GROUP
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