Production method for thionyl chloride

A technology of thionyl chloride and its production method, which is applied in the direction of thionyl chloride, sulfur and halogen compounds, can solve the problems of increasing the production load of the rectification tower, reducing the safety performance of the device, and not being able to condense the tail gas, so as to reduce energy consumption, Ease of operation and load reduction effect

Active Publication Date: 2017-05-24
SHANDONG KAISHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[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 recycled 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 p

Method used

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  • Production method for thionyl chloride
  • Production method for thionyl chloride

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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 sulfur oxychloride generated by the reaction of the reactor directly enters the decomposer after passing through the absorption tower in gaseous state, and enters the decomposer in the absorption tower The liquid phase enters the receiving tank;

[0021] (2) The gas phase crude product thionyl chloride from the decomposer enters the rectification tower, the liquid phase in the receiving tank is circulated back to the synthesis kettle, and the heavy components produced at the bottom of the rectification tower are recycled to the synthesis kettle, and the gas phase at the top of the rectification tower is passed through After condensing, it enters the reflux tank, and part of the liquid phase in the reflux tank is pumped to the rectification tower for reflux by the first machine pump, and the remaining ...

Embodiment 2

[0024] (1) The synthesis gas produced by the reaction of sulfur and chlorine in the synthesis kettle enters the reactor together with sulfur dioxide gas, and the crude product thionyl chloride generated by the reaction of the reactor directly enters the decomposer after passing through the absorption tower in gaseous form, and enters the decomposer in the absorption tower The liquid phase enters the receiving tank;

[0025] (2) The gas phase crude product thionyl chloride from the decomposer enters the rectification tower, the liquid phase in the receiving tank is circulated back to the synthesis kettle, and the heavy components produced at the bottom of the rectification tower are recycled to the synthesis kettle, and the gas phase at the top of the rectification tower is passed through After condensing, it enters the reflux tank, and part of the liquid phase in the reflux tank is pumped to the rectification tower for reflux by the first pump, and the remaining liquid phase in...

Embodiment 3

[0028] (1) The synthesis gas produced by the reaction of sulfur and chlorine in the synthesis kettle enters the reactor together with sulfur dioxide gas, and the crude product thionyl chloride generated by the reaction of the reactor directly enters the decomposer after passing through the absorption tower in gaseous form, and enters the decomposer in the absorption tower The liquid phase enters the receiving tank;

[0029] (2) The gas phase crude product thionyl chloride from the decomposer enters the rectification tower, the liquid phase in the receiving tank is circulated back to the synthesis kettle, and the heavy components produced at the bottom of the rectification tower are recycled to the synthesis kettle, and the gas phase at the top of the rectification tower is passed through After condensing, it enters the reflux tank, and part of the liquid phase in the reflux tank is pumped to the rectification tower for reflux by the first pump, and the remaining liquid phase in...

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Abstract

The invention belongs to the technical field of chemical production, and particularly relates to a production method for thionyl chloride. The production method comprises the following step: introducing synthesis gas generated by reaction, in a reaction kettle, of sulfur and chlorine gas, and sulfur dioxide gas into a reactor, and enabling a crude product thionyl chloride generated by the reactor to directly enter a splitter in the form of gas after passing through an absorption tower; introducing gas-phase crude product thionyl chloride from the splitter to enter a rectifying column, condensing gas-phase on the top of the rectifying tower, and introducing the condensed gas-phase into a reflux tank; introducing the gas phase in the reflux tank to enter a vacuum-pumping tank through an ejector and alloying a synthesis kettle in a circulating mode, and recovering a qualified product from the middle part of the rectifying column. According to the production method, a light component in the crude product thionyl chloride is converted into a heavy component through the adsorption tower, and pressure drop before and after conversion is relatively small, operation is easy, automation is easily realized and conversion is more complete by adopting the tower, so that the load of the rectifying system is greatly reduced.

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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IPC IPC(8): C01B17/45
CPCC01B17/4584
Inventor 李云龙谢圣斌王荣海张善民孙丰春毕义霞张清新刘嵩张良王鑫海
Owner SHANDONG KAISHENG NEW MATERIALS
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