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Preparation method for reagent-grade anhydrous sodium carbonate

Anhydrous sodium carbonate, reagent-grade technology, applied in the field of preparation of reagent-grade anhydrous sodium carbonate, can solve the problems of high cost, low product purity, cumbersome operation process, etc., and achieve simple operation, good impurity removal effect and low cost Effect

Active Publication Date: 2014-02-26
SINOPHARM CHEM REAGENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the present invention is to provide a preparation method of reagent grade anhydrous sodium carbonate, to overcome the disadvantages of complicated operation process, low product purity and high cost in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dissolve 200g of industrial anhydrous sodium carbonate in 1000mL of high-purity water with a specific impedance greater than 17MΩ.cm at room temperature, add 400g of organic amine immobilized catalyst, heat up to 50°C, and pass in carbon dioxide gas under stirring to adjust the pH value to 8 , continue to stir for 2 hours, filter while hot to remove the solid phase, filter the filtrate through a cellulose acetate microfiltration membrane with a pore size of 0.22 μm under heat preservation, concentrate the obtained filtrate, remove 600 mL of water, cool to 5 ° C, and precipitate Crystallized, and the filtered solid was dried in a dryer at 300° C. and pulverized to obtain 158 g of reagent grade anhydrous sodium carbonate.

Embodiment 2

[0022] Dissolve 100g of industrial anhydrous sodium carbonate in 800mL 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, and pass in carbon dioxide gas under stirring to adjust the pH value to 7 , continue to stir for 4 hours, filter while hot to remove the solid phase, filter the filtrate through a cellulose acetate microfiltration membrane with a pore size of 0.10 μm under heat preservation, concentrate the obtained filtrate, remove 600 mL of water, cool to 0 ° C, and Crystallized, and the filtered solid was dried in a dryer at 350° C. and pulverized to obtain 169 g of reagent grade anhydrous sodium carbonate.

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PUM

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Abstract

The invention discloses a preparation method for reagent-grade anhydrous sodium carbonate. The method comprises the following steps with industrial anhydrous sodium carbonate as a raw material, dissolving the industrial anhydrous sodium carbonate in high-purity water; adding an organic amine immobilized catalyst; introducing carbon dioxide gas to adjust a pH value; and subjecting filtrate obtained after filtration to filtration with a cellulose acetate microporous filtration membrane, crystallization and drying so as to obtain the reagent-grade anhydrous sodium carbonate. The reagent-grade anhydrous sodium carbonate prepared by using the method has purity of 99.9 wt%, less than 10 ppm of impurity anions and less than 5 ppm of impurity metal ions, according with standards for guaranteed reagents prescribed in GBT-639-2008 for anhydrous sodium carbonate. The method has the advantages of simple and convenient operation, a good impurity removal effect, good product purity, low cost and suitability for industrial production.

Description

technical field [0001] The invention relates to a preparation method of reagent grade anhydrous sodium carbonate. Background technique [0002] Anhydrous sodium carbonate is an important basic inorganic chemical, pharmaceutical, and light industrial raw material. Reagent grade anhydrous sodium carbonate is usually used as analytical reagent, such as reference reagent, decomposing sample flux, precipitant, buffer, sample volatile agent in emission spectrum analysis, and also used to prepare sodium salt, sodium glass and film printing and washing, etc. With the continuous development of high technology, the application of anhydrous sodium carbonate in food, medicine and other fields is also expanding day by day, and higher requirements are put forward for the purity of anhydrous sodium carbonate: that is, the purity of anhydrous sodium carbonate of reagent grade is greater than 99.8%. , the mass concentration of impurity anions is lower than 10ppm, and the mass concentration ...

Claims

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Application Information

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IPC IPC(8): C01D7/35C01D7/22
Inventor 顾弘婕陈红马骏冯苗凌芳
Owner SINOPHARM CHEM REAGENT
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