A kind of preparation method of gas phase catalytic synthesis sulfur dichloride

Abstract

The invention discloses a preparation method for synthetizing sulfur dichloride through gas phase catalysis. Granular activated carbon supported by ferric chloride (FeCl3 / C) is taken as a catalyst, disulfur dichloride and chorine are taken as a reaction raw material and a carrier gas, a vaporized gas mixture of the disulfur dichloride and the chorine enters a fixed bed catalysis tubular reactor, the sulfur dichloride is prepared with a continuous gas phase catalysis method, the sulfur dichloride produced through the reaction is cooled by a condenser to be collected, and the excess chlorine is recycled. The sulfur dichloride product obtained with the method is free of catalyst residues, distillation is not required, and the content of sulfur dichloride in the product is higher than 90%. The excess chlorine is recycled. The preparation method is simple to operate, continuous, stable, high in conversion rate and free of waste gas and waste liquor emissions, so that the environmental pollution is reduced.

Description

technical field [0001] The invention relates to a preparation method of sulfur dichloride. Background technique [0002] Sulfur dichloride is an important inorganic chemical product, and its molecular structure is: [0003] Cl-S-Cl [0004] It is widely used in organic synthesis, producing acid anhydrides or chlorides of organic acids, additives for high-pressure lubricants and cutting oils, and processing agents for vegetable oils (such as corn oil and soybean oil). It can also be used as a disinfectant and fungicide. [0005] CN95110380 discloses a synthesis method of sulfur dichloride, which uses sulfur and chlorine to synthesize disulfur dichloride at 30-80°C, and then controls the reaction temperature to 30-80°C to pass chlorine gas into the disulfur dichloride liquid Sulfur dichloride gas is produced in the The reaction rate of this method is slow, and the yield has not been reported. [0006] CN91104832 discloses a synthesis method of sulfur dichloride, which use...

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Problems solved by technology

[0016] 1. Since the reaction of disulfide dichloride to obtain sulfur dichloride is a reversible reaction, the reaction is easy to proceed in the direction of the reverse reaction when the chlorine gas is not too much, so it is difficult to achieve high conversion rate and high content of dichloride in the traditional process sulfur

The conversion rate of sulfur dichloride produced by the above process is lower than 90%, and the content is lower than 87%.

[0017] 2. Most of the catalysts can be removed by filtration in the traditional process, but some catalysts are still dissolved in the sulfur dichloride product, which affects the quality of the product, and the catalyst needs to be separated by distillation

However, a certain amount of phosphorus trichloride (or phosphorus pentachloride, etc.) will be contained in the still liquid after distillation. Under the condition that there is a stabilizer, the still liquid can no longer react with chlorine gas, causing the still liquid to be unable to be recycled. , can only be treated as waste liquid, and the amount of three wastes is large

[0019] 4. The content of sulfur dichloride product distilled by traditional technology is less than 85%

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