Preparation method of analytically pure sodium thiosulfate

A pure sodium thiosulfate, sodium sulfite technology, applied in the direction of thiosulfate/dithionite/polythionite, etc., can solve the problem of high impurity content, low purity of sodium thiosulfate, and can not meet the high-end technology industry and other problems, to achieve the effect of low impurity content, high production efficiency and easy operation control.

Inactive Publication Date: 2010-11-24
TIANJIN CHEM REAGENT RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The sodium thiosulfate prepared by this method has low purity and high impurity content, which can only meet the nee...

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0015] A preparation method for analyzing pure sodium thiosulfate, the steps of the preparation method are:

[0016] (1) Sodium sulfite reacts with sulfur powder:

[0017] Put 1 kg of sulfurous acid in a stainless steel reactor, add 2000 ml of distilled water, heat to dissolve, the temperature is 60 ° C until dissolved, then heat the solution to boiling, and slowly add 0.15 kg of sulfur powder into the In the stainless steel reactor, the reaction mixture was boiled for 2.5 hours, and 580 milliliters of distilled water were added in the solution to replenish the moisture lost in the evaporation process; boiling continued until the solution was no longer alkaline (pH should be at 6.5 with litmus paper), Stop heating, let stand for 5 hours, and filter to obtain solution A.

[0018] (2) make analytically pure sodium thiosulfate:

[0019] Heat and concentrate the solution A obtained in step (1), control the temperature at 85 ° C, concentrate the solution to 22 ° Be, cool to obtai...

Embodiment 2

[0021] (1) Sodium sulfite reacts with sulfur powder:

[0022] Put 1.5kg of sulfurous acid in a stainless steel reactor, add 3000ml of distilled water, heat to dissolve, the temperature is 70°C until dissolved, then heat the solution to boiling, and slowly add 0.225kg of sulfur powder under constant stirring In a stainless steel reactor, the reaction mixture was boiled for 3 hours, and 700 milliliters of distilled water was added to the solution to replenish the water lost in the evaporation process; boiling continued until the solution was no longer alkaline (pH should be 7 with litmus paper) , stop heating, let stand for 6 hours, filter to obtain solution A.

[0023] (2) make analytically pure sodium thiosulfate:

[0024] Heat and concentrate the solution A obtained in step (1), control the temperature at 90 ° C, concentrate the solution to 23 ° Be, cool to obtain crystals, drain with a bag funnel, and transfer to a vacuum dryer at 35 ° C for 4 hours. Cooling is taken out t...

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PUM

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Abstract

The invention relates to a preparation method of analytically pure sodium thiosulfate, comprising the following steps: (1) placing distilled water and sodium sulfite into a stainless steel reactor, heating for dissolving, heating the mixed solution until boiling, slowly adding sulphur powder to the stainless steel reactor, enabling the reacted mixture to boil for 2-3 hours until the solution does not show alkalinity, stopping heating, standing for 5-6 hours, and filtering to obtain solution A; and (2) heating and concentrating the solution A into 22-33 degree Be, cooling to obtain crystals, moving the crystals into a vacuum drier to dry at 30-35 DEG C, and taking out to obtain the finished product. In the method, the analytically pure sodium thiosulfate is obtained by synthetic reaction of the sodium sulfite and the sulphur powder, thus having simple process steps, easily controlled operation and high production efficiency; and the obtained sodium thiosulfate has low impurity content, thus the product can be widely applied to the market.

Description

technical field [0001] The invention belongs to the field of inorganic compounds, in particular to a method for preparing analytically pure sodium thiosulfate. Background technique [0002] Analytical pure sodium thiosulfate is widely used in analytical reagents, reference reagents, and fixers in the photographic industry. The current method is: thoroughly pulverize sodium sulfite and rod-shaped sulfur, boil, filter, and concentrate to crystallize. The sodium thiosulfate prepared by this method has low purity and high impurity content, which can only meet the fields of electroplating, leather and fabric printing and dyeing, and cannot meet the needs of high-end technology industries. Contents of the invention [0003] The purpose of the present invention is to overcome existing deficiencies, provide a kind of preparation method of the analytically pure sodium thiosulfate of high purity, low impurity content, simple technique, high production efficiency. [0004] The prese...

Claims

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Application Information

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IPC IPC(8): C01B17/64
Inventor 胡建华
Owner TIANJIN CHEM REAGENT RES INST
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