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Method for rapidly preparing high-purity sodium thiosulfate crystals

A pure sodium thiosulfate and sodium sulfite technology, applied in the direction of thiosulfate/dithionite/polythionite, etc., can solve the problems of slow crystal precipitation, long experiment time, and time-consuming concentration, and achieve crystal The precipitation speed is fast, the experimental equipment is less, and the effect of reducing links

Inactive Publication Date: 2018-04-27
王亚玲
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of this invention is to provide a kind of method for fast preparation high-purity sodium thiosulfate crystal, to solve the existing preparation method experiment time is long, output is little, purity is low, crystal precipitation speed is slow, concentrating time-consuming problems such as

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  • Method for rapidly preparing high-purity sodium thiosulfate crystals

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Embodiment Construction

[0010] The following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

[0011] Put 6.3 g of sodium sulfite, 3.2 g of sulfur powder, and 30 mL of distilled water into a small beaker, close the large beaker, heat the reaction in microwave for 1 min, cool to room temperature, and recover the sulfur powder by suction filtration; add 150 mL of acetone to the filtrate, stir for 5~ Crystals appeared in 6 minutes, filtered by suction, washed with 10 mL of acetone to obtain sodium thiosulfate crystals, dried in vacuum for 2 hours, and weighed; acetone was recovered from the filtrate by distillation and reused; the remaining liquid was recovered for use in preparation again.

[0012] The optimal condition of the heating reaction is: heating at 210 W for 3*20 s;

[0013] The optimum mass ratio of the reaction raw materials is sodium sulfite: sulfur powder: distilled water=6.3:3.2:30, and the filtrate is best treated with 150 ...

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Abstract

The invention discloses a method for rapidly preparing high-purity sodium thiosulfate crystals. The method comprises the following steps: adding 6.3 g of sodium sulfite, 3.2 g of sulfur powder and 30mL of distilled water into a small beaker, covering the small beaker with a large beaker, carrying out a microwave heating reaction for 1 min, cooling the obtained reaction product to normal temperature, and carrying out suction filtration to recover the sulfur powder; adding 150 mL of acetone to the obtained filtrate, stirring the filtrate and the acetone for 5-6 min to make crystals appear, carrying out suction filtration, washing the obtained crystals with 10 mL of acetone to obtain sodium thiosulfate crystals, carrying out vacuum drying for 2 h, and weighing the dried sodium thiosulfate crystals; distilling the obtained filtrate to recover the acetone for reuse; and recovering the obtained remaining solution for next preparation. The method has the advantages of high substance utilization rate, less experiment devices, simplicity and convenience in operation, safety and simplicity in the experiment devices, short experiment time, high yield, high purity, good crystal precipitationspeed, omission of the evaporative concentration link in traditional experiments, reduction of requirements of the experiments for the devices, low experiment cost, less raw material waste, energy saving, environmental protection and no pollution.

Description

technical field [0001] The invention belongs to the field of inorganic chemical synthesis, in particular to a method for rapidly preparing high-purity sodium thiosulfate crystals. Background technique [0002] Sodium thiosulfate has strong complexing ability and strong reducibility. It can be used as fixer, reducing agent in electroplating industry, water purifying agent in water purification project, bleaching agent, dechlorination agent, Sulfur dye and anti-whitening agent, used as detergent, disinfectant and fading agent in the pharmaceutical industry. But there are some deficiencies in the method for preparing sodium thiosulfate at present, specifically: 1. the reaction steps are loaded down with trivial details, and the time is too long, and the requirement to equipment is higher, and it is more dangerous to use concentrated sulfuric acid, and pH is difficult to control and adjust, and is also difficult to measure pH. 2. When evaporating and concentrating, if the speed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/64
CPCC01B17/64
Inventor 王亚玲苟如虎
Owner 王亚玲
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