Method for producing thionyl chloride

Abstract

The invention belongs to the technical field of chemical industry production, and in particular relates to a method for producing thionyl chloride. The method comprises the following steps: sulfur dioxide gas and synthetic gas generated by reaction of sulfur and chlorine gas in a synthesis reactor enter a reactor together, the crude product thionyl chloride in a gaseous form generated by reaction in the reactor directly enters a rectifying tower through an absorbing tower; the gas phase at the top of the rectifying tower enters a reflux drum after condensation; the gas phase in the reflux drum enters an evacuated drum through an ejector, and then is cyclically nested back to the synthesis reactor; and a qualified product is obtained in the middle part of the rectifying tower. According to the method for producing thionyl chloride, because the process pipeline is short and a process of condensing regasification is saved, heat in the system can be utilized more sufficiently, and the energy consumption of devices is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a method for producing thionyl chloride. Background technique [0002] ZL95110380.6 discloses a manufacturing method of thionyl chloride, the method is to put the crude thionyl chloride obtained by cooling the thionyl chloride prepared by catalytic synthesis into the distillation still with sulfur powder added in advance, Distillation to obtain liquid thionyl chloride product. [0003] According to literature, in the preparation process of thionyl chloride, the crude thionyl chloride synthesized by the reactor is condensed and then subjected to batch rectification or rectification of two-stage rectification tower / three-stage rectification tower. [0004] During the preparation of thionyl chloride, the crude sulfur oxychloride in the gas phase from the reactor is condensed and sulfur mixed, and then the liquid phase is rectified, while the gas phase is rec...

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Problems solved by technology

[0004] During the preparation process of thionyl chloride, the crude sulfur oxychloride in the gas phase from the reactor is condensed and sulfur mixed, and then the liquid phase is rectified, while the gas phase is circulated back to the reaction system; at the same time, the tail gas generated in the rectification process is condensed and then recycled to the reaction system. Reaction system, but it cannot condense all the tail gas, resulting in a certain material loss. The tail gas that has not been cooled needs to be emptied after water absorption and alkali absorption treatment. The process is relatively complicated and causes material loss; at the same time, too many condensers are used. The safety performance of the device is greatly reduced; the crude thionyl chloride is condensed and then gasified to cause a certain amount of steam consumption, and corresponding power equipment needs to be equipped with high energy consumption; if the gaseous crude thionyl chloride from the reactor directly enters The rectification tower increases the production load of the rectification tower

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