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Method for manufacturing food-grade dipotassium hydrogen phosphate by using wet-process dilute phosphoric acid

A technology of dipotassium hydrogen phosphate and dilute phosphoric acid, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of low cost and achieve the effects of low cost, simple process and high utilization rate of raw materials

Inactive Publication Date: 2020-02-21
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For dipotassium hydrogen phosphate produced by wet-process dilute phosphoric acid cannot meet food-grade requirements and the deficiencies in the prior art, the purpose of the present invention is to provide a method for producing food-grade dipotassium hydrogen phosphate by wet-process dilute phosphoric acid , low cost, high purity, sufficient removal of arsenic and heavy metal ions, high hygiene and safety, easy method, simple operation, high raw material utilization rate, good solubility, and can be mechanized to manufacture food-grade dipotassium hydrogen phosphate

Method used

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  • Method for manufacturing food-grade dipotassium hydrogen phosphate by using wet-process dilute phosphoric acid

Examples

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Effect test

Embodiment 1

[0036] A kind of method utilizing wet process dilute phosphoric acid to manufacture food grade dipotassium hydrogen phosphate, its steps are:

[0037] (1) Membrane filtration: Take 1.75kg of wet-process dilute phosphoric acid (aqueous solution) whose main components are phosphoric acid content 40% (mass fraction), sulfate radical content 1.5% (mass fraction) and fluoride ion content 0.5% (mass fraction) in an acid-resistant container , using microporous membrane equipment with membrane material of silicon carbide, membrane pores of 0.04 μm, and membrane components in the form of briquette-type inner tubular membranes to precisely filter it, separate pigment particles, suspended solids and solid particles, etc., and obtain precision-filtered wet French dilute phosphoric acid for use.

[0038] (2) Neutralization reaction and simultaneous defluorination and desulfurization Neutralization reaction and simultaneous defluorination and desulfurization: Take the finely filtered wet-pr...

Embodiment 2

[0045] A kind of method utilizing wet process dilute phosphoric acid to manufacture food grade dipotassium hydrogen phosphate, its steps are:

[0046] (1) Membrane filtration: Take 9.83 kg of wet-process dilute phosphoric acid (aqueous solution) whose main components are phosphoric acid content 43% (mass fraction), sulfate radical content 1.6% (mass fraction) and fluoride ion content 0.6% (mass fraction) in an acid-resistant container , using microporous membrane equipment with membrane material of silicon carbide, membrane pores of 0.1 μm, and membrane components in the form of briquette-type inner tubular membranes to precisely filter it, separate pigment particles, suspended solids and solid particles, etc., and obtain precision-filtered wet French dilute phosphoric acid for use.

[0047] (2) Neutralization reaction and simultaneous defluorination and desulfurization: take (1) the obtained precision-filtered wet-process dilute phosphoric acid in an acid-resistant container,...

Embodiment 3

[0054] A kind of method utilizing wet process dilute phosphoric acid to manufacture food grade dipotassium hydrogen phosphate, its steps are:

[0055] (1) Membrane filtration: Take 3.95 kg of wet-process dilute phosphoric acid (aqueous solution) whose main components are phosphoric acid content 37% (mass fraction), sulfate radical content 1.4% (mass fraction) and fluoride ion content 0.4% (mass fraction) in an acid-resistant container , using microporous membrane equipment with membrane material of silicon carbide, membrane pores of 0.04 μm, and membrane components in the form of briquette-type inner tubular membranes to precisely filter it, separate pigment particles, suspended solids and solid particles, etc., and obtain precision-filtered wet French dilute phosphoric acid for use.

[0056] (2) Neutralization reaction and simultaneous defluorination and desulfurization: Take the precision-filtered wet-process dilute phosphoric acid obtained in step (1) in an acid-resistant c...

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Abstract

The invention discloses a method for manufacturing food-grade dipotassium hydrogen phosphate by using wet-process dilute phosphoric acid. The steps are as follows: (1) performing membrane filtration:taking the wet-process dilute phosphoric acid into an acid-resistant container, and performing precision-filtering with membrane filtration equipment to obtain purified wet-process dilute phosphoric acid; (2) carrying out a neutralization reaction and performing simultaneous defluorination and desulfurization: adding a defluorination and desulfurization agent and a potassium hydroxide solution, performing stirring and filtering to obtain a filtered neutralization solution; (3) performing arsenic removal by oxidation, heavy metal removal under slightly alkaline conditions, and membrane filtration: adding an oxidant into the filtered neutralization solution, adjusting the pH value to slightly alkaline, performing heating, cooling and membrane filtration to obtain a solution after arsenic removal by oxidation, and heavy metal removal under slightly alkaline conditions; (4) performing pH adjustment and concentration: adjusting the pH value of the solution after arsenic removal by oxidation, and heavy metal removal under slightly alkaline conditions, and performing concentration to obtain a concentrated solution of dipotassium hydrogen phosphate; (5) performing cooling crystallization:crystallizing dipotassium hydrogen phosphate in the temperature range of a dipotassium hydrogen phosphate crystallization metastable zone, and then performing continue crystallization until no crystallization occurs; and (6) drying crystals. According to the method, the cost is low, the purity is high, hygiene and safety are high, the method is easy to implement, the operation is simple and convenient, the raw material utilization rate is high, the dissolving performance is good, and mechanization can be realized.

Description

technical field [0001] The invention relates to the technical field of food additive processing, and more specifically relates to a method for producing food-grade dipotassium hydrogen phosphate with wet-process dilute phosphoric acid, which is suitable for producing food-grade dipotassium hydrogen phosphate and pharmaceutical grade Dipotassium hydrogen phosphate, feed grade dipotassium hydrogen phosphate, industrial grade dipotassium hydrogen phosphate and agricultural grade dipotassium hydrogen phosphate. Background technique [0002] Dipotassium hydrogen phosphate is an important chemical raw material, which is widely used in industrial sectors such as biological fermentation, food, medicine, feed, chemical industry and agriculture. The production methods of dipotassium hydrogen phosphate mainly include neutralization method, extraction method, ion exchange method, double decomposition method, direct method, crystallization method and electrolysis method, among which the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/30
CPCC01B25/308C01P2006/80
Inventor 吴正奇李摇摇姚其凤许琦徐歆吴龙李倩陈小强
Owner HUBEI UNIV OF TECH
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