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Method for preparing anhydrous sodium carbonate

A technology of anhydrous sodium carbonate and sodium bicarbonate, which is applied in the direction of changing the crystal water content of alkali metal carbonate, can solve problems such as inability to remove, low product pass rate, and impact on detection accuracy, and achieve the effect of improving purity

Inactive Publication Date: 2010-05-26
TIANJIN CHEM REAGENT RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can only remove the water-insoluble impurities in the industrial anhydrous sodium carbonate, but cannot remove the M contained in the industrial anhydrous sodium carbonate. g 2+ 、C a 2+ and F e 2+ , so that the detection accuracy obtained during the chemical analysis is affected, which may lead to errors in the test results; at the same time, the sodium carbonate solution should be concentrated for a long time, so that the clarity of the anhydrous sodium carbonate finished product is not high, resulting in a lower product pass rate. Low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1). Dissolve 40kg of industrial sodium carbonate in water to make industrial sodium carbonate aqueous solution, adjust the pH value of the industrial sodium carbonate aqueous solution to 14 with sodium hydroxide, stir and heat to 60°C, react for 1 hour, keep warm for 2 hours, and filter have to go to M g 2+ 、C a 2+ Aqueous sodium carbonate solution.

[0021] (2). Going to M g 2+ 、C a 2+ Add 100ml of hydrogen peroxide to the sodium carbonate aqueous solution, keep it warm for 23 hours, and filter to remove F e 2+ Aqueous sodium carbonate solution.

[0022] (3). Going to F e 2+ CO was introduced into the sodium carbonate solution 2 Saturation was achieved, and an aqueous sodium bicarbonate solution was obtained in which sodium bicarbonate precipitated out.

[0023] (4). Suction filter the sodium bicarbonate aqueous solution to obtain sodium bicarbonate crystals.

[0024] (5). After washing the sodium bicarbonate crystals with water, dehydrate them with a de...

Embodiment 2

[0026] (1). Dissolve 50kg of industrial sodium carbonate in water to make an aqueous solution of industrial sodium carbonate, adjust the pH value of the aqueous solution of industrial sodium carbonate to 13.5 with sodium hydroxide, stir and heat to 55°C, react for 0.5 hours, keep warm for 2.5 hours, and filter have to go to M g 2+ 、C a 2+ Aqueous sodium carbonate solution.

[0027] (2). Going to M g 2+ 、C a 2+ Add 125ml of hydrogen peroxide to the sodium carbonate aqueous solution, keep it warm for 22 hours, and filter to remove F e 2+ Aqueous sodium carbonate solution.

[0028] (3). Going to F e 2+ CO was introduced into the sodium carbonate solution 2 Saturation was achieved, and an aqueous sodium bicarbonate solution was obtained in which sodium bicarbonate precipitated out.

[0029] (4). Suction filter the sodium bicarbonate aqueous solution to obtain sodium bicarbonate crystals.

[0030] (5). After washing the sodium bicarbonate crystals with water, dehydrat...

Embodiment 3

[0032] (1). Dissolve 100kg of industrial sodium carbonate in water to make industrial sodium carbonate aqueous solution, adjust the pH value of the industrial sodium carbonate aqueous solution to 13 with sodium hydroxide, stir and heat to 65°C, react for 1.5 hours, keep warm for 1.5 hours, and filter have to go to M g 2+ 、C a 2+ Aqueous sodium carbonate solution.

[0033] (2). Going to M g 2+ 、C a 2+ Add 250ml of hydrogen peroxide to the sodium carbonate aqueous solution, keep it warm for 22 hours, and filter to remove F e 2+ Aqueous sodium carbonate solution.

[0034] (3). Going to F e 2+ CO was introduced into the sodium carbonate solution 2 Saturation was achieved, and an aqueous sodium bicarbonate solution was obtained in which sodium bicarbonate precipitated out.

[0035] (4). Suction filter the sodium bicarbonate aqueous solution to obtain sodium bicarbonate crystals.

[0036] (5). After washing the sodium bicarbonate crystals with water, dehydrate them wit...

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Abstract

The invention relates to a method for preparing anhydrous sodium carbonate. The preparation method comprises the following steps: (1) dissolving industrial sodium carbonate in water to prepare aqueous solution of the industrial sodium carbonate, and adding sodium hydroxide into the solution to remove Mg2+ and Ca2+; (2) adding hydrogen peroxide into aqueous solution of the sodium carbonate in which the Mg2+ and the Ca2+ are removed to remove Fe2+; (3) introducing CO2 into the aqueous solution of the sodium carbonate in which the Fe2+ is removed; (4) filtering the aqueous solution of the sodium carbonate to obtain sodium carbonate crystals; and (5) washing, dehydrating and drying the sodium carbonate crystals to obtain an anhydrous sodium carbonate finished product serving as a reference reagent. The method can effectively remove the Mg2+, the Ca2+ and the Fe2+ in the industrial anhydrous sodium carbonate, remarkably improve the purity of the product, and meanwhile effectively solve the problem of lower product qualification rate caused by low clarity of the anhydrous sodium carbonate finished product because of concentrating the solution of the sodium carbonate for long term.

Description

technical field [0001] The invention belongs to the field of chemical reagents, in particular to a preparation method of standard reagent anhydrous sodium carbonate. Background technique [0002] Anhydrous sodium carbonate is used as a reference reagent and is widely used in chemical analysis in various industries. The current method for preparing anhydrous sodium carbonate is: dissolving industrial anhydrous sodium carbonate in hot distilled water, then concentrating its aqueous solution after filtration to obtain the standard reagent anhydrous sodium carbonate used. This method can only remove the water-insoluble impurities in the industrial anhydrous sodium carbonate, but cannot remove the M contained in the industrial anhydrous sodium carbonate. g 2+ 、C a 2+ and F e 2+ , so that the detection accuracy obtained during the chemical analysis is affected, which may lead to errors in the test results; at the same time, the sodium carbonate solution should be concentrate...

Claims

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Application Information

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IPC IPC(8): C01D7/35
Inventor 张为玲
Owner TIANJIN CHEM REAGENT RES INST
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