Method for optimizing production process of thionyl chloride

Abstract

The invention relates to a method for optimizing a production process of thionyl chloride and belongs to the technical field of chemical engineering. Liquid sulfur in a liquid sulfur tank is metered by a metering pump and then pumped into an atomizing device in a distillation column; a crude thionyl chloride product is mixed with the liquid sulfur at the top of the distillation column; sulfur dichloride in the crude thionyl chloride product and the liquid sulfur are subjected to a reaction, a heavy component, namely, sulfur monochloride, is produced and withdrawn from the bottom of the distillation column, remaining crude thionyl chloride product is condensed by a condenser and enters a return tank, a part of liquid phase in the return tank is pumped into the distillation column by a reflux pump to be recycled, and the remaining liquid-phase material is recovered from the return tank. By means of the method, automatic sulfur addition is realized, time and labor cost are saved, and thedecoloration effect is better.

Description

technical field [0001] The invention relates to a method for optimizing the production process of thionyl chloride, which belongs to the technical field of chemical industry. 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] In the preparation process of thionyl chloride, the gaseous thionyl chloride crude product coming out of the reactor is condensed, sulfur mixed and then rectified in the liquid phase. The rectification process requires a decolorization process, and the crude thionyl chloride and the top chlorination Sulfur dichloride in sulfoxide vapor reacts with sulfur to transform into easily separated heavy component sulfur monochloride. However, the original decolorizatio...

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Problems solved by technology

However, the original decolorization process uses gas-solid decolorization, which has low decolorization efficiency and poor effect.

This process relies on manual filling of sulfur to decolorize the gas phase material at the top of the distillation tower. During this process, sulfur is easy to agglomerate, causing the risk of overpressure leakage in the distillation system. The artificial filling method causes certain harm to operators and the environment. , and the frequent opening and closing of the decolorization tank will lead to material leakage and environmental pollution due to its poor sealing; the large amount of solid sulfur filling will cause a large system load, and excessive sulfur will be applied to the distillation system. Sulfur precipitation at low temperature will block the pipeline and affect production; at the same time, the site of solid sulfur decolorization needs to have a sufficient amount of sulfur, which will cause a large amount of sulfur to accumulate on site, posing safety hazards

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