Method for preparing high-purity anhydrous sodium carbonate by using membrane method

A technology of anhydrous sodium carbonate and industrial sodium carbonate, applied in the direction of alkali metal carbonate to change crystal water content, etc., can solve the problem of poor alkali resistance of cellulose acetate microporous filtration membrane, poor economic benefit of industrial production, and sodium carbonate concentration. Low and other problems, to overcome the inability of continuous production, easy operation, and good filtration effect

Inactive Publication Date: 2015-03-25
TIANJIN BOHUA YONGLI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method prepares the cellulose acetate microporous filter membrane used in the high-purity sodium carbonate process to have poor alkali resistance, and the prepared sodium carbonate concentration is low, which makes the production of the process lower in the same time period, and the economic benefit of industrialized production is relatively poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) 20kg of industrial sodium carbonate is dissolved in 55 DEG C of distilled water to make a solution with a sodium carbonate mass content of about 28%, heated and stirred for 1 hour, so that calcium ions are fully precipitated;

[0019] (2) Add 20 g of sodium hydroxide to the solution and stir at 55° C. for 1 hour to fully precipitate the magnesium ions in the solution until the magnesium ion content in the solution is lower than 5 ppm;

[0020] (3) Filtrate with a ceramic membrane to obtain a refined solution heated and evaporated, and the crystal slurry liquid is sent to a centrifuge, and deionized water is added to the centrifuge to wash the filter cake until there is no chloride ion in the filter cake, and dried at 110°C to obtain a high Pure Sodium Carbonate.

[0021] After testing: the calcium content in the sodium carbonate obtained by using the method is lower than 1ppm, the magnesium content is lower than 1ppm, the SS is lower than 1ppm, and the chlorine cont...

Embodiment 2

[0023] (1) 50kg of anhydrous sodium carbonate is dissolved in 65 DEG C of distilled water to prepare a solution with a mass content of sodium carbonate of about 30%, heated and stirred for 1 hour, so that calcium ions are fully precipitated;

[0024] (2) Add 50 g of sodium hydroxide to the solution, stir at 65° C. for 1 hour to fully precipitate the magnesium ions in the solution until the magnesium ion content in the solution is lower than 5 ppm;

[0025] (3) Filtrate with a ceramic membrane to obtain a refined solution heated and evaporated, and the crystal slurry liquid is sent to a centrifuge, and deionized water is added to the centrifuge to wash the filter cake until there is no chloride ion in the filter cake, and dried at 110°C to obtain a high Pure Sodium Carbonate.

[0026] After testing: the calcium content in the sodium carbonate obtained by using the method is lower than 1ppm, the magnesium content is lower than 1ppm, the SS≤1ppm, and the chlorine content is lower...

Embodiment 3

[0028] (1) 50kg of anhydrous sodium carbonate is dissolved in 60 DEG C of distilled water to prepare a solution with a mass content of sodium carbonate of about 30%, heated and stirred for 1 hour, so that calcium ions are fully precipitated;

[0029] (2) Add 50 g of sodium hydroxide to the solution, stir at 60° C. for 1 hour to fully precipitate the magnesium ions in the solution until the magnesium ion content in the solution is lower than 5 ppm;

[0030] (3) Filtrate with a ceramic membrane to obtain a refined solution heated and evaporated, and the crystal slurry liquid is sent to a centrifuge, and deionized water is added to the centrifuge to wash the filter cake until there is no chloride ion in the filter cake, and dried at 110°C to obtain a high Pure Sodium Carbonate.

[0031] After testing: the calcium content in the sodium carbonate obtained by the method is lower than 1ppm, the magnesium content is lower than 1ppm, the SS≤1ppm, and the chlorine content are lower than...

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PUM

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Abstract

The invention discloses a method for preparing high-purity anhydrous sodium carbonate by using a membrane method. The method comprises the following steps: (1) dissolving industrial sodium carbonate with distilled water of 55-65 DEG C, and stirring to ensure that calcium impurities in the industrial sodium carbonate are fully deposited; (2) adding a sodium hydroxide solution into the solution, and stirring at 55-65 DEG C to ensure that magnesium ions in the solution are fully deposited until the magnesium ion content of the solution is lower than 5ppm; (3) filtering the solution by using a ceramic membrane; (4) evaporating a filtrate after filtration, putting an obtained magma solution into a centrifuge for separation, and adding deionized water into the centrifuge to wash filter cakes until no chloride ion is generated in the filter cakes; and (5) drying the product obtained by centrifuging to obtain high-purity anhydrous sodium carbonate, wherein in the high-purity anhydrous sodium carbonate, Ca<2+> is less than or equal to 1ppm, Mg<2+> is less than or equal to 1ppm, SS is less than or equal to 1ppm, and Cl<-> is less than or equal to 2ppm. In the high-purity anhydrous sodium carbonate prepared by the method disclosed by the invention, Ca<2+> is less than or equal to 1ppm, Mg<2+> is less than or equal to 1ppm, SS is less than or equal to 1ppm, and Cl<-> is less than or equal to 2ppm.

Description

technical field [0001] The invention relates to a method for preparing high-purity anhydrous sodium carbonate, in particular to a method for preparing high-purity anhydrous sodium carbonate using a membrane method. Background technique [0002] High-purity anhydrous sodium carbonate can be prepared from industrial sodium carbonate, which contains Ca 2+ , Mg 2+ and other impurities, these impurity ions will be dissolved in the mother liquor during alkalization, and these impurity ions need to be removed when preparing high-purity anhydrous sodium carbonate, so as to ensure that qualified high-purity sodium carbonate products are obtained. In the traditional method for preparing high-purity anhydrous sodium carbonate, for Ca 2+ , Mg 2+ For the removal of impurities, add sodium hydroxide and flocculant after alkalization, use a clarifier to settle the precipitate, evaporate the supernatant, centrifuge, wash, and dry to obtain a high-purity anhydrous sodium carbonate product....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/35
Inventor 王松晓庞栓林李治水谢智勇
Owner TIANJIN BOHUA YONGLI CHEM IND
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