The production method of thionyl chloride

A technology for thionyl chloride and a production method, which is applied in the directions of thionyl chloride, sulfur and halogen compounds, etc., can solve the problems of increasing the production load of a rectifying tower, reducing the safety performance of the device, and failing to condense the tail gas, thereby reducing energy consumption and ensuring Conversion efficiency and load reduction effect

Active Publication Date: 2019-05-21
SHANDONG KAISHENG NEW MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During the preparation process of thionyl chloride, the crude sulfur oxychloride in the gas phase from the reactor is condensed and sulfur mixed, and then the liquid phase is rectified, while the gas phase is circulated back to the reaction system; at the same time, the tail gas generated in the rectification process is condensed and then recycled to the reaction system. Reaction system, but it cannot condense all the tail gas, resulting in a certain material loss. The tail gas that has not been cooled needs to be emptied after water absorption and alkali absorption treatment. The process is relatively complicated and causes material loss; at the same time, too many condensers are used. The safety performance of the device is greatly reduced; the crude thionyl chloride is condensed and then gasified to cause a certain amount of steam consumption, and corresponding power equipment needs to be equipped with high energy consumption; if the gaseous crude thionyl chloride from the reactor directly enters The rectification tower increases the production load of the rectification tower

Method used

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  • The production method of thionyl chloride

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Effect test

Embodiment 1

[0020] (1) The synthesis gas produced by the reaction of sulfur and chlorine in the synthesis kettle enters the reactor together with the sulfur dioxide gas, and the crude product thionyl chloride generated by the reaction of the reactor directly enters the rectification tower after being decolorized in the sulfur tank in gaseous form, and the sulfur tank The bottom liquid phase is circulated and used as a synthetic kettle, and the heavy components produced at the bottom of the rectification tower are recycled and used as a synthetic kettle;

[0021] (2) The gas phase at the top of the rectification tower enters the reflux tank after being condensed, and part of the liquid phase in the reflux tank is pumped to the rectification tower by the first pump to reflux, and the remaining liquid phase in the reflux tank is taken out and used to synthesize the kettle; part of the liquid phase The volume ratio to the remaining liquid phase is 6:1;

[0022] (3) The gas phase in the reflux...

Embodiment 2

[0024] (1) The synthesis gas produced by the reaction of sulfur and chlorine in the synthesis kettle enters the reactor together with the sulfur dioxide gas, and the crude product thionyl chloride generated by the reaction of the reactor directly enters the rectification tower after being decolorized in the sulfur tank in gaseous form, and the sulfur tank The bottom liquid phase is circulated and used as a synthetic kettle, and the heavy components produced at the bottom of the rectification tower are recycled and used as a synthetic kettle;

[0025] (2) The gas phase at the top of the rectification tower enters the reflux tank after being condensed, and part of the liquid phase in the reflux tank is pumped to the rectification tower by the first pump to reflux, and the remaining liquid phase in the reflux tank is taken out and used to synthesize the kettle; part of the liquid phase The volume ratio to the remaining liquid phase is 4:1;

[0026] (3) The gas phase in the reflux...

Embodiment 3

[0028] (1) The synthesis gas produced by the reaction of sulfur and chlorine in the synthesis kettle enters the reactor together with the sulfur dioxide gas, and the crude product thionyl chloride generated by the reaction of the reactor directly enters the rectification tower after being decolorized in the sulfur tank in gaseous form, and the sulfur tank The bottom liquid phase is circulated and used as a synthetic kettle, and the heavy components produced at the bottom of the rectification tower are recycled and used as a synthetic kettle;

[0029] (2) The gas phase at the top of the rectification tower enters the reflux tank after being condensed, and part of the liquid phase in the reflux tank is pumped to the rectification tower by the first pump to reflux, and the remaining liquid phase in the reflux tank is taken out and used to synthesize the kettle; part of the liquid phase The volume ratio to the remaining liquid phase is 10:1;

[0030] (3) The gas phase in the reflu...

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Abstract

The invention belongs to the technical field of chemical production and particularly relates to a production method of thionyl chloride. Synthesis gas produced by sulfur and chlorine through a reaction in a synthesis kettle and sulfur dioxide gas enter a reactor together, and crude thionyl chloride generated through the reaction in the reactor is directly decolorized by a sulfur tank in a gas state and then enters a rectifying tower; a gas phase at the top of the rectifying tower enters a return tank after being condensed, a gas phase in the return tank enters an exhaustion tank through an ejector and is cyclically and mechanically applied to the synthesis kettle, and a qualified product is produced from the middle of the rectifying tower. Thionyl chloride is produced in a fully-closed circulation manner, no wastewater, waste gas or waste residues are discharged, and the product yield basically reaches 100%.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a production method of thionyl chloride. Background technique [0002] ZL95110380.6 discloses a manufacturing method of thionyl chloride, the method is to put the crude thionyl chloride obtained by cooling the thionyl chloride prepared by catalytic synthesis into the distillation still with sulfur powder added in advance, Distillation to obtain liquid thionyl chloride product. [0003] According to literature, in the preparation process of thionyl chloride, the crude thionyl chloride synthesized by the reactor is condensed and then subjected to batch rectification or rectification of two-stage rectification tower / three-stage rectification tower. [0004] During the preparation of thionyl chloride, the crude sulfur oxychloride in the gas phase from the reactor is condensed and sulfur mixed, and then the liquid phase is rectified, while the gas phase is rec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/45
CPCC01B17/4584
Inventor 王荣海谢圣斌张良毕义霞张善民喻桂朋孙丰春张清新王鑫海刘嵩张泰铭
Owner SHANDONG KAISHENG NEW MATERIALS
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