Azeotropic distillation device for purifying perchloromethyl mercaptan

By combining vacuum distillation and azeotropic rectification with an azeotropic distillation apparatus and using dichloroethane as an azeotropic agent, the carbon tetrachloride content in perchloromethane mercaptan is reduced, solving the problem of substandard captan products and achieving efficient purification and energy saving.

CN224370695UActive Publication Date: 2026-06-19INNER MONGOLIA GUANSHIDA CHEM CO LTD
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Patent Information

Application Number
CN202521500855.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-07-17
Publication Date
2026-06-19
Estimated Expiration
2035-07-17

AI Technical Summary

Technical Problem

In existing technologies, the carbon tetrachloride content in perchloromethanethiol is too high, resulting in the synthesized captan product failing to meet export standards and incurring high production costs.

Method used

An azeotropic distillation apparatus is used, combining vacuum distillation and azeotropic rectification. The carbon tetrachloride content in perchloromethane is reduced by forming a binary azeotrope with the azeotropic agent dichloroethane and carbon tetrachloride. Multiple coolers and reflux tanks are used to improve separation efficiency, and the latent heat of liquefaction is recovered through a feed preheater to reduce energy consumption.

Benefits of technology

It significantly reduces the carbon tetrachloride content in perchloromethanethiol to below 100 ppm, meeting export standards, reducing production costs, improving the product quality and purification efficiency of captan, and achieving savings in equipment investment and energy consumption.

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Abstract

The utility model provides an azeotropic distillation device for purifying perchloromethyl mercaptan, which belongs to the technical field of captan production and comprises a distillation kettle and an azeotropic distillation tower, a feeding hole of the distillation kettle is connected with a perchloromethyl mercaptan storage tank, a distillation outlet in the upper part of the distillation kettle is connected with a carbon tetrachloride storage tank through a vacuum pump, and a discharging hole in the bottom of the distillation kettle is connected with a feeding hole of the azeotropic rectifying tower through a feeding pump; the feeding hole of the azeotropic rectifying tower is also connected with a dichloroethane storage tank; a bottom discharge port of the azeotropic rectifying tower is connected with the captan synthesis kettle, and a top discharge port of the azeotropic rectifying tower is connected with the azeotrope storage tank. According to the device, the content of carbon tetrachloride can be remarkably reduced, the process and operation are simple, the used entrainer can be repeatedly used, the content of carbon tetrachloride in purified perchloromethyl mercaptan is reduced to 100 ppm or below, and the purified perchloromethyl mercaptan can be directly fed into a captan synthesis kettle to participate in a synthesis reaction, so that the perchloromethyl mercaptan meets the export standard.
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