Device and method for recycling tail gas from thionyl chloride production

Abstract

The invention provides a device and a method for recycling tail gas from thionyl chloride production, and relates to the field of chemical technical production. According to the invention, tail gas from synthesis of thionyl chloride is used for closed cycle production; the tail gas comprises sulfur monochloride, sulfur dichloride, thionyl chloride, chlorine and sulfur dioxide; the tail gas is pumped into a thionyl chloride synthesis reactor through a liquid spraying device for cyclic utilization; when the whole set of production device is used in the actual production process, pressure fluctuation among the devices is reduced, basically no waste liquid or waste gas is discharged outwards, meanwhile, the whole set of production device can ensure that the purity of the crude thionyl chlorideproduct is maintained in a target range quickly within the time from starting to stable operation of the equipment, and the time required for stable operation of the whole set of system is shortened.

Description

technical field [0001] The invention relates to the field of chemical technology production, in particular to a device and method for recycling tail gas produced by thionyl chloride. Background technique [0002] There are more than a dozen production methods of thionyl chloride, but large-scale industrial production is basically the following three process routes: [0003] (1) Phosphorus pentachloride reacts with sulfur dioxide, the process is simple, but SOCl 2 with POCl 3 Difficult to separate, difficult to obtain high-purity SOCl 2 ; [0004] (2) Using antimony chloride etc. as a catalyst, sulfur chloride reacts with chlorosulfonic acid, which is widely used in China at present, with complicated process and large investment; [0005] (3) Gas-phase catalytic method, using activated carbon as a catalyst, reacting sulfur chloride with sulfur dioxide and chlorine gas, widely used abroad, with simple process, low investment and high product purity, can be produced by clos...

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Problems solved by technology

[0003] (1) Phosphorus pentachloride reacts with sulfur dioxide, the process is simple, but SOCl 2 with POCl 3 Difficult to separate, difficult to obtain high-purity SOCl 2 ;

[0004] (2) Using antimony chloride etc. as a catalyst, sulfur chloride reacts with chlorosulfonic acid, which is widely used in China at present, with complicated process and large investment;

[0009] 1), under the pressure fluctuation of the synthesis reactor, the gas from the condenser and the degassing device cannot enter the synthesis tank;

[0010] 2), the gas is easy to flow back, making it difficult to carry out continuous production

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