A kind of thionyl chloride production system and start-up method thereof

Abstract

The invention provides a thionyl chloride production system and a start-up method thereof, the system comprises a sequentially connected sulfur dichloride synthesis kettle, a thionyl chloride synthesis kettle, a crude product condenser, a gas-liquid separator, and a crude product receiving tank , a sulfur distribution kettle, a rectification kettle, a rectification tower, a rectification condenser, a finished product tank, a crude product circulation device, and a stabilizing device; the liquid inlet of the crude product circulation device is connected with the liquid outlet pipeline of the crude product receiving tank, and the The liquid outlet of the crude product circulation device is connected with the liquid inlet pipeline of the crude product receiving tank, and is used to circulate the sulfur oxychloride crude product after the system is started; the described stabilization device is respectively connected with the crude product receiving tank and the crude product circulation device, It is used to control the purity of the crude thionyl chloride from the start-up of the system to the stable stage of operation. The thionyl chloride production system and its start-up method described in the present invention can promote the thionyl chloride production system to reach a stable operation state as soon as possible, and shorten the time required for the system to run from start-up to stable operation.

Description

technical field [0001] The invention relates to a thionyl chloride production system and a start-up method thereof. Background technique [0002] Thionyl chloride is an intermediate raw material for the synthesis of pesticides, medicines, photosensitive materials and polymer intermediates. In the prior art, there are more than a dozen methods for synthesizing thionyl chloride, but there are basically three processes for large-scale industrial production , Phosphorus pentachloride method, chlorosulfonic acid method and gas phase synthesis method. Among these methods, the gas-phase synthesis of sulfur dioxide is widely used due to its simple process, low investment and high product purity, which is produced by a closed internal circulation device and has no environmental pollution. [0003] In the early research process of the gas phase synthesis method of sulfur dioxide, the applicant submitted a number of patent applications such as CN200810004779.9, CN200810004781.6, CN200...

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Problems solved by technology

[0006] In view of this, the present invention aims to propose a thionyl chloride production system and its start-up method, to solve the problem in the prior art, in the actual production process of the chemical plant, the thionyl chloride production system starts to run from start-up Between stability, it takes too long

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