Method for producing food-grade disodium hydrogen phosphate by using wet-process dilute phosphoric acid

A technology of disodium hydrogen phosphate and dilute phosphoric acid, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., to achieve effective removal

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 disodium hydrogen phosphate produced by wet-process dilute phosphoric acid can not meet food-grade requirements and existing deficiencies in the prior art, the purpose of the present invention is to provide a method for utilizing wet-process dilute phosphoric acid to produce food-grade disodium hydrogen phosphate , the method is easy, the operation is simple, the cost is low, the purity is high, the removal of arsenic and heavy metal ions is sufficient, the hygiene and safety are high, the process is simple, the utilization rate of raw materials is high, the solubility is good, and food-grade disodium hydrogen phosphate can be mechanized manufactured

Method used

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  • Method for producing food-grade disodium hydrogen phosphate by using wet-process dilute phosphoric acid

Examples

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Embodiment 1

[0036] A kind of method that utilizes wet method dilute phosphoric acid to manufacture food grade disodium hydrogen phosphate, its step is:

[0037] (1) Membrane filtration: Take 1.85 kg of wet-process dilute phosphoric acid (aqueous solution) with a phosphoric acid content of 40% (mass fraction), a sulfate radical content of 1.5% (mass fraction) and a fluoride ion content of 0.5% (mass fraction) in an acid-resistant In the container, the membrane material is silicon carbide, the membrane pore is 0.04μm, and the membrane module is a briquette-type inner tubular membrane for precise filtration to separate pigment particles, suspended solids and solid particles, etc., to obtain precision filtration. Wet-process dilute phosphoric acid for use.

[0038] (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 container, and add barium carbonate with a ma...

Embodiment 2

[0045] A kind of method that utilizes wet method dilute phosphoric acid to manufacture food grade disodium hydrogen phosphate, its step is:

[0046] (1) Membrane filtration: Take 10.19kg 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 the precision-filtered wet-process dilute phosphoric acid obtained in step (1) in an acid-resistant cont...

Embodiment 3

[0054] A kind of method that utilizes wet method dilute phosphoric acid to manufacture food grade disodium hydrogen phosphate, its step is:

[0055] (1) Membrane filtration: Take 4.25 kg of wet-process dilute phosphoric acid (aqueous solution) with a phosphoric acid content of 37% (mass fraction), a sulfate radical content of 1.4% (mass fraction) and a fluoride ion content of 0.4% (mass fraction) in an acid-resistant In the container, the membrane material is silicon carbide, the membrane pore is 0.04μm, and the membrane module is a briquette-type inner tubular membrane for precise filtration to separate pigment particles, suspended solids and solid particles, etc., to obtain precision filtration. Wet-process 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 container, and add barium carbonate with a ma...

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Abstract

The invention discloses a method for producing food-grade disodium hydrogen phosphate by using wet-process dilute phosphoric acid. The method comprises the steps as follows: (1) membrane filtration: placing wet-process dilute phosphoric acid in an acid-resistant container, and filtering the wet-process dilute phosphoric acid by membrane filtration equipment to obtain purified wet-process dilute phosphoric acid; (2) neutralization reaction and simultaneous defluorination and desulfurization: placing the dilute phosphoric acid in an acid-resistant container, adding a defluorination and desulfurization agent and a potassium hydroxide solution, and carrying out stirring to obtain a neutralization solution; (3) oxidative arsenic removal, slightly alkaline heavy metal removal and membrane filtration: carrying out stirring, adding an oxidizing agent, adjusting the pH value to slight alkalinity, and carrying out heating, cooling and membrane filtration to obtain alkaline heavy metal removal and oxidative arsenic removal solution; (4) pH regulation and concentration: adjusting the pH of the slightly alkaline heavy metal removal and oxidative arsenic removal solution to obtain a disodium hydrogen phosphate concentrated solution; (5) cooling crystallization: transferring the disodium hydrogen phosphate concentrated solution in equipment, decreasing the temperature, and continuing crystallization; and (6) crystallization and drying. The method is easy to implement, simple and convenient to operate, low in cost and high in purity, arsenic and heavy metal ions are fully removed, the solubility property 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 disodium hydrogen phosphate with wet dilute phosphoric acid. It is suitable for making food grade disodium hydrogen phosphate, pharmaceutical grade disodium hydrogen phosphate, feed grade disodium hydrogen phosphate, industrial grade disodium hydrogen phosphate and agricultural grade disodium hydrogen phosphate by using wet process dilute phosphoric acid and wet process phosphoric acid. Background technique [0002] Disodium 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 manufacturing methods of disodium hydrogen phosphate mainly include neutralization method, extraction method, ion exchange method, double decomposition method, direct method, crystallization method and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/30C01B25/234
CPCC01B25/234C01B25/301C01P2006/80
Inventor 吴正奇许琦李摇摇姚其凤徐歆吴龙李倩陈小强
Owner HUBEI UNIV OF TECH
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