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Method for preparing thionyl chloride

A technology of thionyl chloride and chlorine gas, applied in the direction of thionyl chloride, sulfur and halogen compounds, etc., can solve problems such as complicated process, and achieve the effects of improving product yield, strong system safety and low energy consumption

Inactive Publication Date: 2017-01-11
SHANDONG KAISHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, most domestic thionyl chloride production enterprises adopt the sulfur dioxide gas phase method, but the process of producing thionyl chloride by this method is complicated, and more condensers, pumps, etc. are inevitably added during the synthesis and preparation of thionyl chloride. equipment

Method used

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  • Method for preparing thionyl chloride

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Effect test

Embodiment 1

[0016] The raw material mixture gas composed of sulfur dioxide, chlorine and sulfur dichloride enters from the upper part of the reactor, the gas phase of the crude thionyl chloride directly enters the rectification tower from the lower part of the reactor, and the gas phase at the top of the rectification tower is circulated back to the reactor, and the rectification tower The product is extracted from the middle part, and the product enters the blowing tank to blow off the light component with nitrogen to obtain a qualified product; the pressure of the reactor and the rectification tower are both normal pressure, the temperature of the reactor is 101 °C, and the temperature of the rectification tower top is The gas phase is circulated by fan control, and a liquid accumulator is installed in the middle of the rectification tower. The temperature of the liquid accumulator is controlled at 77°C, and the temperature of the rectification tower is 135°C. The product yield is 99.97%...

Embodiment 2

[0018] The raw material mixture gas composed of sulfur dioxide, chlorine and sulfur dichloride enters from the upper part of the reactor, the gas phase of the crude thionyl chloride directly enters the rectification tower from the lower part of the reactor, and the gas phase at the top of the rectification tower is circulated back to the reactor, and the rectification tower The product is taken out in the middle, and the product enters the blowing tank to blow off the light components with nitrogen to obtain qualified products; the pressure of the reactor and the rectifying tower are both normal pressure, the temperature of the reactor is 200 °C, and the temperature of the rectifying tower top is The gas phase is circulated by fan control, and a liquid accumulator is installed in the middle of the rectification tower. The temperature of the liquid accumulator is controlled at 76°C, and the temperature of the rectification tower tank is 110°C. The product yield is 99.96%.

Embodiment 3

[0020] The raw material mixture gas composed of sulfur dioxide, chlorine and sulfur dichloride enters from the upper part of the reactor, the gas phase of the crude thionyl chloride directly enters the rectification tower from the lower part of the reactor, and the gas phase at the top of the rectification tower is circulated back to the reactor, and the rectification tower The product is taken out in the middle, and the product enters the blowing tank to blow off the light components with nitrogen to obtain qualified products; the pressure of the reactor and the rectification tower are both normal pressure, the temperature of the reactor is 395 °C, and the temperature of the top of the rectification tower The gas phase is circulated by fan control, and a liquid accumulator is installed in the middle of the rectification tower. The temperature of the liquid accumulator is controlled at 78°C, and the temperature of the rectification tower is 130°C. The product yield is 99.96%.

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Abstract

The invention belongs to the technical field of chemical synthesis, and particularly relates to a method for preparing thionyl chloride. Raw material mixed gas composed of sulfur dioxide, chlorine and sulfur dichloride enters a reactor from the upper portion, a crude product thionyl chloride gas phase directly enters a rectifying tower from the lower portion of the reactor, the gas phase on the top of the rectifying tower is recycled back to the reactor, a product is produced in the middle of the rectifying tower and enters a blowdown tank so that light components in the product can be blown away by nitrogen, and a qualified product is obtained. The pressure of the reactor and the pressure of the rectifying tower are normal pressure. The process for preparing thionyl chloride through a sulfur dioxide method is simplified, normal-pressure reaction is conducted, the process is simple, energy consumption is low, system safety is high, and the product yield is improved and reaches 99.95% or above.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a method for preparing thionyl chloride. Background technique [0002] At present, most domestic thionyl chloride production enterprises adopt the sulfur dioxide gas phase method, but the process of producing thionyl chloride by this method is complicated, and more condensers, pumps, etc. are inevitably added during the synthesis and preparation of thionyl chloride. equipment. Contents of the invention [0003] The purpose of the present invention is to provide a method for preparing thionyl chloride, which has low energy consumption, simple production process and greatly improved product yield. [0004] The method for preparing thionyl chloride of the present invention is that the raw material mixture gas composed of sulfur dioxide, chlorine and sulfur dichloride enters from the upper part of the reactor, and the gas phase of the crude thionyl chloride ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/45
CPCC01B17/4584
Inventor 王荣海谢圣斌宋家训张善民孙丰春张清新张良高俊张泰铭
Owner SHANDONG KAISHENG NEW MATERIALS
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