Cooling capacity cyclic utilization process for producing thionyl chloride

Abstract

The invention relates to a cooling capacity cyclic utilization process for producing thionyl chloride and belongs to the field of chemical technology production. A cold liquid which is deeply cooled by a cold liquid storage tank enters a heat exchanger. A circulating pump pumps out water in a circulation water pool, and the pumped water enters the heat exchanger. The cold liquid and circulating water perform heat exchange in the heat exchanger. The cold liquid subjected to heat exchange is vaporized by a vaporizer and then enters a production system. Circulating water subjected to heat exchange enters a refrigerator, so that the water return temperature of circulating water is reduced. According to the process, cooling capacity carried by the cold liquid in the production process of thionyl chloride is fully utilized, so that the energy consumption is reduced, and meanwhile, vaporization of lots of circulating water is avoided. The operating load of the refrigerator in high-temperatureseason is reduced, and favorable equipment operation is guaranteed.

Description

technical field [0001] The invention relates to a refrigeration cycle utilization process for producing thionyl chloride, which belongs to the field of chemical technology production. Background technique [0002] The industrial production methods of thionyl chloride mainly include chlorosulfonic acid method, phosphorus oxychloride co-production method, and sulfur dioxide gas phase method. At present, sulfur dioxide gas phase method is mainly used in China. The process route is to react chlorine gas, sulfur dioxide and sulfur dichloride in the presence of activated carbon to generate thionyl chloride. The process is simple, requires less investment and has high product purity. [0003] In order to ensure sufficient reaction in this process, the feeding amount will be higher than the theoretical value, so that the crude thionyl chloride contains excessive chlorine, sulfur dioxide and sulfur dichloride, so the crude product is purified by the sulfur compounding process, most o...

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Problems solved by technology

[0004] (1) The cold liquid enters the reaction system after being heated and vaporized by high-temperature steam, which causes waste of cooling capacity during the energy transfer process;

[0005] (2) During the operation of the refrigerator, it is necessary to compress the cold liquid for heat exchange. Due to the high temperature in high temperature seasons, the limited heat exchange capacity of the cooling water tower results in insufficient heat exchange, which increases the load on the compressor, resulting in energy loss and equipment damage;

[0006] (3) The cooling effect of circulating water deteriorates, and the high temperature of the refrigerant in the high temperature season makes the condensation effect deteriorate, causing a large amount of tail gas to be unable to condense and fully enter the tail gas system. The entry of a large amount of tail gas increases the pressure of alkali absorption, and more alkali needs to be invested Neutralization is likely to cause environmental protection incidents; at the same time, the increase in exhaust gas absorption pressure reduces the production capacity of the device and limits the production capacity of the device

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