Method for preparing high-purity anhydrous sodium carbonate

An anhydrous sodium carbonate, sodium carbonate technology, applied in the direction of alkali metal carbonate, chemical instruments and methods, alkali metal carbonate to change the crystal water content, etc., can solve the problem of low purity of anhydrous sodium carbonate, low production efficiency, There are no problems such as competitiveness, and the process parameters and various operations are easy to control, the production process is advanced, and the steps are simple.

Inactive Publication Date: 2010-11-17
TIANJIN CHEM REAGENT RES INST
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0002] High-purity anhydrous sodium carbonate is widely used in the production and manufacture of display tubes of high-end electronic component materials, high-purity and chemical products used in special fields. Heating and decomposing to obtain anhydrous sodium carbonate, the anhydrous sodium carbonate prepared by this method has low purity, high impurity content, low production efficiency, and no competitiveness in the market

Method used

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Examples

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Embodiment 1

[0021] A preparation method of high-purity anhydrous sodium carbonate, the method is as follows:

[0022] (1) Dissolving industrial anhydrous sodium carbonate:

[0023] Slowly add 1 kg of industrial anhydrous sodium carbonate into 3 kg of distilled water in a stainless steel bucket, and measure its relative density to be 1.1 g / mL while stirring continuously to obtain solution A.

[0024] (2) make sodium carbonate:

[0025] Put 1kg of analytically pure ethanol into a stainless steel basin, place activated carbon and a low-purity filter screen on the basin, then slowly pour 1kg of A solution into the sieve for filtration, the filtrate flows into the ethanol basin, stir continuously, and cool naturally until the sodium carbonate precipitates finished, suction filtered and dried to obtain sodium carbonate B.

[0026] (3) make high-purity sodium carbonate:

[0027] Put the B obtained in step (2) in a polyethylene plastic bucket, add 2.5kg of distilled water and stir to dissolve,...

Embodiment 2

[0029] A preparation method of high-purity anhydrous sodium carbonate, the method is as follows:

[0030] (1) Dissolving industrial anhydrous sodium carbonate:

[0031] Slowly add 1 kg of industrial anhydrous sodium carbonate into 4 kg of distilled water in a stainless steel bucket, and measure its relative density to be 1.18 g / mL while stirring constantly, to obtain solution A.

[0032] (2) make sodium carbonate:

[0033] Put 1.5kg of analytically pure ethanol into a stainless steel basin, place activated carbon and a low-purity filter sieve on the basin, then slowly pour 1.5kg of A solution into the sieve for filtration, the filtrate flows into the ethanol basin, stir continuously, and cool naturally until sodium carbonate After analysis, filter with suction and dry to obtain sodium carbonate B.

[0034] (3) make high-purity sodium carbonate:

[0035] Put the B obtained in step (2) in a polyethylene plastic bucket, add 3kg of distilled water and stir to dissolve, filter t...

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Abstract

The invention relates to a method for preparing high-purity anhydrous sodium carbonate. The method comprises the following steps of: (1) dissolving the anhydrous sodium carbonate; (2) preparing soda crystals, which is to slowly pour solution A into a sieve for filtration, allow the filtrate to flow into a alcohol basin, continuously stir the mixed solution and allow the mixed solution to cool naturally till the sodium carbonate is separated out; and (3) preparing the high-purity anhydrous sodium carbonate, which is to fill product B obtained by step (2) into a polyethylene plastic barrel, add distilled water to dissolve the product B with stirring, heating, stirring and crystallizing the mixed solution, performing crystallization to obtain crystals, and drying the crystals to obtain the high-purity anhydrous sodium carbonate. The method for preparing the high-purity anhydrous sodium carbonate comprises the step that the purified sodium carbonate is filtered to separate out crystals in the ethanol. The whole production process is advanced, the steps are simple, and the process parameters and all operation are easily controlled.

Description

technical field [0001] The invention belongs to the field of preparation methods of inorganic compounds, in particular to a preparation method of high-purity anhydrous sodium carbonate. Background technique [0002] High-purity anhydrous sodium carbonate is widely used in the production and manufacture of display tubes of high-end electronic component materials, high-purity and chemical products used in special fields. Decompose by heating to obtain anhydrous sodium carbonate. The anhydrous sodium carbonate produced by this method has low purity, high impurity content, low production efficiency, and no competitiveness in the market. [0003] Patent 200910249993 discloses pharmaceutical grade high-purity anhydrous sodium carbonate and its preparation method. The method includes mixing industrial sodium carbonate with purified water to fully dissolve it; placing it in a clarification tank and allowing it to settle; adding a biosorbent to oscillate to absorb heavy metals ions,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/35C01D7/22
Inventor 胡建华
Owner TIANJIN CHEM REAGENT RES INST
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