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A kind of preparation method of food grade potassium carbonate

A potassium carbonate, food-grade technology, applied in the direction of alkali metal carbonate, chemical instruments and methods, alkali metal compounds, etc., can solve the problems of difficult product quality, high cost, cumbersome preparation process of potassium carbonate, etc., and achieve product quality Stable, easy to operate, good impurity removal effect

Active Publication Date: 2016-03-16
SINOPHARM CHEM REAGENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a kind of preparation method of food-grade potassium carbonate, to overcome the deficiencies of the prior art potassium carbonate preparation process is loaded down with trivial details, cost is high, and product quality is difficult to reach the standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Dissolve 100g of industrial potassium chloride in 300mL of high-purity water with a specific impedance greater than 17MΩ·cm at room temperature, add 200g of organic amine immobilized catalyst, heat up to 50°C with stirring, and adjust the pH value to 8 by introducing carbon dioxide gas, continue Stir for 4 hours, filter while hot to remove the solid phase, and filter the obtained filtrate through a cellulose acetate microfiltration membrane with a pore size of 0.10 μm under the condition of 50°C heat preservation. After the obtained filtrate is concentrated, cool to 5°C , and the solid phase obtained after filtering the precipitated crystals was dried at a temperature of 200° C. to obtain 84 g of food-grade potassium carbonate.

Embodiment 2

[0026] Dissolve 100g of industrial potassium chloride in 500mL of high-purity water with a specific impedance greater than 17MΩ·cm at room temperature, add 300g of organic amine immobilized catalyst, heat up to 60°C under stirring, and adjust the pH value to 9 by introducing carbon dioxide gas, continue Stir for 2 hours, filter while hot to remove the solid phase, and filter the obtained filtrate through a cellulose acetate microfiltration membrane with a pore size of 0.22 μm at 60 ° C. After concentrating the obtained filtrate, cool to 0 ° C. , and the solid phase obtained after filtering the precipitated crystals was dried at a temperature of 250° C. to obtain 84 g of food-grade potassium carbonate.

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PUM

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Abstract

The invention discloses a preparation method of food-grade potassium carbonate. The method comprises the following steps: dissolving industrial grade potassium chloride as a raw material into high-purity water; adding an organic amine-immobilized catalyst, and then introducing a carbon dioxide gas to adjust the pH value; carrying out film filtration on the filtered filtrate by using a cellulose acetate micro-pore filtering film; and crystallizing and drying, so as to obtain the food-grade potassium carbonate. According to the food-grade potassium carbonate prepared by the method disclosed by the invention, the purity can be up to 99.0wt%, the content of metal impurities is below 10ppm, the content of an impurity arsenic element is less than 2ppm, the GB25588-2010 standard for food additive potassium carbonate is met, and the preparation method is simple and convenient to operate, stable in product quality, low in cost and applicable to industrial production and has a good impurity removal effect.

Description

technical field [0001] The invention relates to a preparation method of food-grade potassium carbonate. Background technique [0002] Potassium carbonate is an important inorganic chemical raw material, which is widely used in medicine, dyes and other fields. For example, the pharmaceutical industry can be used to manufacture long-acting sulfonamides, progesterone, estradiol benzoate and other drugs, and the dye industry can be used to manufacture disperse red 3B , Indanthrene and other dyes can also be used to manufacture titanium dioxide, potassium aluminum fluoride, potassium sodium tartrate and other inorganic chemicals, inks, polyesters, explosives, detergents, etc. With the continuous development of high-tech, the application of potassium carbonate in food, medicine and other fields is also expanding day by day, and there are higher requirements for the purity of food-grade potassium carbonate: that is, the purity of food-grade potassium carbonate is greater than 99.0%...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D7/00
Inventor 凌芳王伟倪传宏曹丽丽郑琦
Owner SINOPHARM CHEM REAGENT