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Refining method and device for refining thionyl chloride

A technology of thionyl chloride and purification method, which is applied in the direction of thionyl chloride, sulfur and halogen compounds, etc., can solve the problems of high by-products, can not completely separate the distillation column, etc., and achieve the effect of flexible export of finished products

Active Publication Date: 2016-08-24
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve SO in the prior art 2 Cl 2 , SOCl 2 The problem of incomplete separation and high temperature in the rectification tower causing by-products, the invention provides a refining method and refining device for thionyl chloride

Method used

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  • Refining method and device for refining thionyl chloride

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Effect test

Embodiment 1

[0035] The crude product produced by the thionyl chloride synthesis reactor is pumped to the rectification tower 2, the pressure of the rectification tower is 0.002-0.012MPa, and the temperature is 77.4-90°C; the heavy components are removed through the rectification tower 2 , SOCl at the top of rectification tower 2 2 The purity of the product is 80%; the overhead flow of the rectifying tower 2 is subjected to oversulfurization treatment in the first oversulfurization tank 3, and the pressure of the first oversulfurization tank is 0.001-0.002MPa, and the temperature is 29-50°C; After the first condenser 4 is condensed, it enters the first separator 5 for gas-liquid separation. The pressure of the first separator is 0.001-0.002MPa, and the temperature is 29°C; the gas phase component Cl 2 , SO 2 enter the reaction system for recycling, the liquid phase rectification tower 2 overhead reflux; the SOCl extracted from the rectification tower 2 side line 2 , SO 2 Cl 2 and a sma...

Embodiment 2

[0037] The crude product produced by the thionyl chloride synthesis reactor is pumped to the rectification tower 2, the pressure of the rectification tower is 0.002-0.012MPa, and the temperature is 90-95°C; the heavy components are removed through the rectification tower 2 , SOCl at the top of rectification tower 2 2 The purity of the product is 80%; the overhead flow of the rectifying tower 2 carries out oversulfurization treatment in the first oversulfurization tank 3, the pressure of the first oversulfurization tank is 0.001-0.002MPa, and the temperature is 50-55°C; After the first condenser 4 is condensed, it enters the first separator 5 for gas-liquid separation. The pressure of the first separator is 0.001-0.002MPa, and the temperature is 29°C; the gas phase component Cl 2 , SO 2 enter the reaction system for recycling, the liquid phase rectification tower 2 overhead reflux; the SOCl extracted from the rectification tower 2 side line 2 , SO 2 Cl 2 and a small amount ...

Embodiment 3

[0039] The crude product produced by the thionyl chloride synthesis reactor is pumped to the rectification tower 2, the pressure of the rectification tower is 0.002-0.012MPa, and the temperature is 100-120°C; the heavy components are removed through the rectification tower 2 , SOCl at the top of rectification tower 2 2 The purity of the product is 80%; the overhead flow of the rectifying tower 2 carries out oversulfurization treatment in the first oversulfurization tank 3, and the pressure of the first oversulfurization tank is 0.001-0.002MPa, and the temperature is 70-80°C; After the first condenser 4 is condensed, it enters the first separator 5 for gas-liquid separation. The pressure of the first separator is 0.001-0.002MPa, and the temperature is 29°C; the gas phase component Cl 2 , SO 2 enter the reaction system for recycling, the liquid phase rectification tower 2 overhead reflux; the SOCl extracted from the rectification tower 2 side line 2 , SO 2 Cl 2 and a small a...

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Abstract

The invention relates to a method and a device for refining sulfoxide chloride. The method comprises the following steps: after rectifying a crude product generated in a sulfoxide chloride synthesis step, performing overvulcanization and condensation on the rectified light component, putting a liquid-phase component obtained through gas-liquid separation into a rectification cycle and putting a gas-phase component obtained through gas-liquid separation into a synthesis step cycle; condensing the gas-phase component generated after the rectified light component is subjected to first vacuum distillation and then putting the condensed gas-phase component into the synthesis step cycle, and performing second vacuum rectification on a heavy component; performing overvulcanization and condensation on the light component obtained by virtue of the second vacuum rectification, returning the liquid-phase component obtained through gas-liquid separation to the second vacuum rectification step cycle, and returning the heavy component to the rectification step cycle; putting the gas-phase components obtained in the two stages of vacuum rectification steps into the synthesis step cycle, respectively. According to the method, a tower system sequence is arranged reasonably, the easily decomposable components are separated under vacuum and at a controlled temperature, and the components difficult to separate are cyclically rectified, and therefore, the separation accuracy and the product quality are improved; after multi-stage rectification, the purity of sulfoxide chloride is above 99.9%.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a method and a device for refining the crude product produced in the synthesis step of thionyl chloride. Background technique [0002] Thionyl chloride (SOCl 2 ) is an important fine chemical product and an intermediate in the synthesis of many chemicals. Because of its strong chlorination and acid chlorination ability, it can significantly improve the utilization of some expensive raw materials. As a chlorination reagent and acyl chloride reagent, thionyl chloride is mainly used in pesticides, medicines, dyes and other industries. It can also be used as a chlorination agent for the synthesis or replacement of alcohols, acid anhydrides, and nitro compounds. It can also be used as a chloracylating agent for the synthesis of compounds such as thiazoline, pyrrolidine, and amides in ring-closing reactions and in some organic synthesis reactions. Catalysts, e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/45
CPCC01B17/4584
Inventor 陈光辉仇如臣周艳霞李建隆
Owner QINGDAO UNIV OF SCI & TECH
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