Synthetic method of sodium pentathiosulfate

A technology of sodium pentathiocarbonate and a synthesis method, which is applied in the directions of alkali metal carbonate, chemical instruments and methods, alkali metal compounds, etc., can solve the problems of low conversion rate, cannot use precipitating agent for heavy metal wastewater, etc., and achieves transformation High rate, easy continuous production, low cost effect

Inactive Publication Date: 2008-11-12
CHONGQING UNIV
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Problems solved by technology

Yet the method for existing synthetic sodium pentathiocarbonate, not only transformation rate is low, and contains a large amount of sodium tetrathiocarbonate (Na 2 CS 4 )
Sodium tetrathiocarbonate can not be used as a precipitant for heavy metal wastewater except that it can be used as an agricultural fungicide and nematocide

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  • Synthetic method of sodium pentathiosulfate

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Embodiment Construction

[0014] A kind of synthetic method of sodium pentathiocarbonate. In this method, the raw materials for the synthesis of sodium pentathiocarbonate are sulfur powder and sodium perthiocarbonate. The synthesis steps are as follows:

[0015] ①Add sulfur powder into the aqueous solution of fully dissolved sodium perthiocarbonate and stir evenly. The molar ratio of sulfur powder to sodium perthiocarbonate is 2.0-2.5:1. Obviously, from the reaction Na 2 CS 3 +2S=Na 2 CS 5 It can be seen that the sulfur powder is in excess, and its purpose is to speed up the reaction. Usually, it is better to take a larger molar ratio.

[0016] ② Add ionic liquid to the mixed solution obtained in step ①, and stir fully. The volume ratio of ionic liquid to sodium perthiocarbonate aqueous solution is 1% to 5%, the synthesis reaction temperature is 30°C to 90°C, and the time is 5min to 40min . Generally, when conditions permit, a larger volume ratio, a higher reaction temperature and a longer reac...

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Abstract

The invention relates to a five-sodium tetrathiocarbonate synthetic method. The method uses sodium thiocarbonate and sulphur powder as raw material. Excess sulphur powder is used to synthesize five-sodium tetrathiocarbonate rapidly in high efficiency under the synergetic action of a phase transfer catalyst ionic liquid and microwaves. The ionic liquid can be used as a phase transfer catalyst, a solubilizer and a microwave absorbent; and a subsidiary product of four-sodium tetrathiocarbonate has small amount. The method is simple in operation and easy to separate and realize continuous production. The five-sodium tetrathiocarbonate synthetic method provides a new idea and a new method for the five-sodium tetrathiocarbonate synthesis.

Description

technical field [0001] The present invention relates to the preparation method of pentathiocarbonate. Background technique [0002] At present, among more than ten methods for treating heavy metal wastewater, sulfide precipitation method is one of the methods with relatively good effect and worthy of further study. Among them, perthiocarbonate (also known as trithiocarbonate) has a good removal effect on heavy metal wastewater and has been commercially applied abroad [Matthew M.Matlock, Kevin R.Henke, David A.Atwoo. Effectiveness of commercial reagents for heavy metal removal from water with new insights for future chelate designs. Journal of Hazardous Materials, B92(2002) 129-142.]. However, the heavy metal sludge obtained by treating heavy metal wastewater with perthiocarbonate is not stable, and the heavy metal sludge is prone to resolubility under heat or acidic conditions. Further studies showed that pentathiocarbonate could improve the stability of heavy metal ion pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/00C02F1/62
Inventor 刘作华陶长元杜军刘仁龙孙大贵成小鹰
Owner CHONGQING UNIV
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