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Method for producing food-grade sodium dihydrogen phosphate by using wet-process dilute phosphoric acid

A technology of sodium dihydrogen phosphate and dilute phosphoric acid, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., to achieve the effect of simplified process, good solubility and simple process

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 the sodium dihydrogen phosphate produced by wet-process dilute phosphoric acid cannot meet the 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 sodium dihydrogen phosphate by wet-process dilute phosphoric acid , the method is easy, the operation is simple, the cost is low, the purity is high, the arsenic and heavy metal ions are fully removed, the hygiene and safety are high, the raw material utilization rate is high, the solubility is good, and food-grade sodium dihydrogen phosphate can be mechanized prepared

Method used

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  • Method for producing food-grade sodium dihydrogen phosphate by using wet-process dilute phosphoric acid

Examples

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Embodiment 1

[0036] A kind of method that utilizes wet process dilute phosphoric acid to manufacture food-grade sodium dihydrogen phosphate, its step is:

[0037] (1) Membrane filtration: Take the wet-process dilute phosphoric acid (aqueous solution) whose main components are 40% (mass fraction) of phosphoric acid content, 1.5% (mass fraction) of sulfate radical content and 0.5% (mass fraction) of fluoride ion content to 0-40°C, 2.29kg in an acid-resistant container, use a microporous membrane device with a membrane material of silicon carbide, a membrane pore of 0.04 μm, and a membrane module in the form of a briquette-type inner tube membrane to filter it precisely to separate pigment particles, suspended solids, and solid particles, etc. , get finely filtered wet-process dilute phosphoric acid for future 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 ...

Embodiment 2

[0045] A kind of method that utilizes wet process dilute phosphoric acid to manufacture food-grade sodium dihydrogen phosphate, its step is:

[0046] (1) Membrane filtration: Take 11.56 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 the precision-filtered wet-process dilute phosphoric acid obtained in step (1) in an acid-resistant co...

Embodiment 3

[0054] A kind of method that utilizes wet process dilute phosphoric acid to manufacture food-grade sodium dihydrogen phosphate, its step is:

[0055] (1) Membrane filtration: Take 5.75 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 co...

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Abstract

The invention discloses a method for producing food-grade sodium dihydrogen phosphate by using wet-process dilute phosphoric acid. The method comprises the steps as follows: (1) membrane filtration: carrying out filtration by membrane filtration equipment; (2) neutralization reaction and defluorination and desulfuration: taking purified wet-process dilute phosphoric acid in an acid-resistant container, adding a defluorination and desulfuration agent and a potassium hydroxide solution, carrying out stirring and membrane filtration to obtain a neutralization solution; (3) oxidation arsenic removal, slightly alkaline heavy metal removal and membrane filtration: adding an oxidizing agent to the neutralization solution, adjusting pH to slight alkalinity, and carrying out heating, cooling and membrane filtration to obtain a slightly alkaline heavy metal removal and oxidation arsenic removal solution; (4) pH regulation and concentration: regulating pH of the slightly alkaline heavy metal removal and oxidation arsenic removal solution with phosphoric acid, and performing concentration to obtain a sodium dihydrogen phosphate concentrated solution; (5) cooling crystallization: transferring the concentrated solution in crystallization equipment, and crystallizing the sodium dihydrogen phosphate at crystallization metastable zone temperature of sodium dihydrogen phosphate until no crystalsare produced; and (6) crystallization and drying. The method is easy to implement, low in cost, high in purity, high in utilization rate of raw materials, good in solubility property and prone to mechanization.

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 sodium dihydrogen phosphate with wet dilute phosphoric acid. It is suitable for making food grade sodium dihydrogen phosphate, pharmaceutical grade sodium dihydrogen phosphate, feed grade sodium dihydrogen phosphate, industrial grade sodium dihydrogen phosphate and agricultural grade sodium dihydrogen phosphate by using wet process dilute phosphoric acid and wet process phosphoric acid. Background technique [0002] Sodium dihydrogen 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 sodium dihydrogen 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): C01B25/30C01B25/234C01B25/237
CPCC01B25/234C01B25/2375C01B25/2377C01B25/301C01P2006/80
Inventor 吴正奇徐歆姚其凤李摇摇许琦吴龙李倩陈小强
Owner HUBEI UNIV OF TECH
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