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Method for preparing food grade potassium dihydrogen phosphate by using industrial wet-process purified phosphoric acid

A technology of potassium dihydrogen phosphate and wet purification, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., to achieve high purity, improved purity, and low cost

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] Aiming at the fact that the potassium dihydrogen phosphate produced by industrial wet purification of phosphoric acid cannot meet the requirements of food grade and the deficiencies in the prior art, the purpose of the present invention is to provide a l

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  • Method for preparing food grade potassium dihydrogen phosphate by using industrial wet-process purified phosphoric acid

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Effect test

Embodiment 1

[0035] A kind of method utilizing industrial wet purification phosphoric acid to manufacture food-grade potassium dihydrogen phosphate, its steps are:

[0036] (1) Add water to dilute and take qualified products conforming to HG / T4069-2008 "Industrial Wet Purification of Phosphoric Acid" and industrial wet purification phosphoric acid with a mass percentage concentration of 85% in an acid-resistant container. The reverse osmosis pure water with a multiple of 1.12 times was continuously stirred for 0.5 hour to obtain an industrial wet purification phosphoric acid dilution solution with a concentration of 40% by mass. During the whole process of controlling this step, the stirring speed is 100 rpm.

[0037] (2) Neutralization reaction and sulfur removal step (1) Put 1.5 kg of industrial wet purification phosphoric acid diluent with 40% concentration in mass percent into an acid-resistant container, and add barium carbonate with a mass fraction of 0.2% in the condition of constan...

Embodiment 2

[0044] A kind of method utilizing industrial wet purification phosphoric acid to manufacture food-grade potassium dihydrogen phosphate, its steps are:

[0045] (1) Add water to dilute and take the qualified products that meet the requirements of HG / T 4069-2008 "Industrial Wet Purification of Phosphoric Acid" and the industrial wet purification phosphoric acid with a mass percentage concentration of 85% in an acid-resistant container. The reverse osmosis pure water with a mass multiple of 0.98 times was stirred for 1.0 hour to obtain an industrial wet purification phosphoric acid dilution with a mass percent concentration of 43%. During the whole process of controlling this step, the stirring speed is 100 rpm.

[0046] (2) Neutralization reaction and sulfur removal step (1) Take 9.83 kg of industrial wet-purified phosphoric acid dilution solution with a mass percentage concentration of 43% in an acid-resistant container, and add 0.3% of its mass fraction of carbonic acid under ...

Embodiment 3

[0053] A kind of method utilizing industrial wet purification phosphoric acid to manufacture food-grade potassium dihydrogen phosphate, its steps are:

[0054] (1) Add water to dilute and take the qualified products that meet the requirements of HG / T 4069-2008 "Industrial Wet Purification of Phosphoric Acid" and the industrial wet purification phosphoric acid with a mass percentage concentration of 85% in an acid-resistant container. The reverse osmosis pure water with a mass multiple of 1.30 times was continuously stirred for 0.5 hour to obtain an industrial wet purification phosphoric acid dilution solution with a mass percentage concentration of 37%. During the whole process of controlling this step, the stirring speed is 100 rpm.

[0055] (2) Neutralization reaction and sulfur removal step (1) 3.5 kg of industrial wet purification phosphoric acid diluent with a mass percentage concentration of 37% is placed in an acid-resistant container, and barium carbonate with a mass f...

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Abstract

The invention discloses a method for preparing food grade potassium dihydrogen phosphate by using industrial wet-process purified phosphoric acid. The method comprises the following steps: (1) addingwater for dilution: placing industrial wet-process purified phosphoric acid in an acid-resistant container, adding pure water, and performing stirring for diluting; (2) performing a neutralizing reaction and removing fluorine and sulfur: adding a fluorine and sulfur removing agent and potassium hydroxide, carrying out stirring for reacting, and performing membrane filtration to obtain a preciselyfiltered neutralizing solution; (3) performing oxidative dearsenification, slightly alkaline heavy metal removal and membrane filtration: adjusting the pH of the neutralizing solution to be slightly alkaline, adding an oxidant, and performing heating, cooling and membrane filtration to obtain a precisely filtered slightly alkaline heavy metal removal and dearsenification solution; (4) performing pH value adjustment and concentration: adjusting the pH value with phosphoric acid and performing concentrating to obtain a potassium dihydrogen phosphate concentrated solution; (5) performing coolingand crystallizing: transferring the concentrated solution into a crystallizing device, and performing stirring, cooling, crystallizing, and solid-liquid separation to obtain potassium dihydrogen phosphate wet crystals; and (6) drying the wet crystals: drying the wet crystals until a water content required by the product to obtain the food-grade potassium dihydrogen phosphate product. The method has the advantages of easy implementation, low cost, high purity and sufficient removal of arsenic and heavy metal ions, and the prepared food grade potassium dihydrogen phosphate has good dissolution performance.

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 potassium dihydrogen phosphate from industrial wet purification of phosphoric acid. Background technique [0002] Potassium dihydrogen phosphate is an important chemical raw material, which is widely used in industrial sectors such as biological fermentation, food, medicine, chemical industry, feed and agriculture. The manufacturing methods of potassium dihydrogen phosphate mainly include neutralization method, extraction method, ion exchange method, double decomposition method, direct method, crystallization method and electrolysis method, among which the main manufacturing method is neutralization method. According to the source of phosphoric acid used, phosphoric acid can be divided into wet-process phosphoric acid obtained by acidification using phosphate rock as raw material and hot wet-process phosphoric aci...

Claims

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Application Information

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IPC IPC(8): C01B25/30
CPCC01B25/30C01P2006/80
Inventor 吴正奇姚其凤李摇摇许琦徐歆吴龙李倩陈小强
Owner HUBEI UNIV OF TECH
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