Thionyl chloride differential pressure thermal coupling rectification method and equipment

Abstract

The invention relates to a differential pressure thermal coupling rectification method and equipment for sulfoxide chloride. According to the equipment, a heavy component removing tower of a re-boiler is arranged at the bottom of a tower and a light component removing tower of a condenser is arranged at the top of the tower; a condensation re-boiler, an auxiliary condenser and a conversion reactor are arranged between the heavy component removing tower and the light component removing tower. An extract of a vapor-phase material at the top of the heavy component removing tower is divided into two parts, wherein one part is connected with a heating medium inlet of the condensation re-boiler, a heating medium outlet is connected with the auxiliary condenser and then returns back to the top of the heavy component removing tower, a liquid-phase material outlet at the bottom of the light component removing tower is connected with a heated medium inlet of the condensation re-boiler, and then a heated medium outlet returns back to the bottom of the light component removing tower; the other part is connected with the conversion reactor to carry out a reaction of converting sulfur dichloride to sulfur chloride, and a reacted material vapor phase enters the light component removing tower. The differential pressure thermal coupling is used for coupling heat at the top of the heavy component removing tower and heat at the bottom of the light component removing tower and the energy consumption is saved. The difficulty of blocking a pipeline by sulfur is overcome. A practical example shows that a differential pressure thermal coupling rectification process can save energy by more than 50% compared with a conventional process.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a rectification method and equipment for sulfur oxychloride differential pressure thermal coupling. Background technique [0002] Thionyl chloride is a colorless or pale yellow liquid with a pungent odor at normal temperature and pressure. It will decompose in a small amount above the boiling point (78.8°C). The decomposition rate is faster at 140°C. The products are sulfur dioxide, chlorine, sulfur dichloride and sulfur monochloride. Because of its strong chlorination and acyl chloride ability, it is an important chemical intermediate and widely used in traditional industries such as agriculture, medicine and dyes. . In addition, the scope of application of thionyl chloride is also expanding, and the downstream fields are gradually increasing. It has been used in food additive industries such as the preparation of sucralose and new energy industries such...

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Problems solved by technology

For now, there are no patents on the energy-saving process of the thionyl chloride rectification system at home and abroad, and the original rectification method used by almost all manufacturers has high energy consumption and does not meet the national energy-saving and emission-reduction needs.

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