Method for producing thionyl chloride

A technology of thionyl chloride and sulfur, which is applied in the direction of thionyl chloride, sulfur and halogen compounds, etc., 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 and improve equipment and equipment The effect of reducing the load

Active Publication Date: 2017-05-31
SHANDONG KAISHENG NEW MATERIALS
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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 abso

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  • Method for producing 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 sulfur dioxide gas, and the crude product thionyl chloride generated by the reaction of the reactor directly enters the rectification tower after passing through the absorption tower in gaseous form, and enters the rectification tower in the absorption tower The liquid phase enters the receiving tank;

[0021] (2) The liquid phase in the receiving tank is recycled to the synthesis kettle, and the heavy components produced at the bottom of the rectification tower are recycled to the synthesis kettle. The gas phase at the top of the rectification tower enters the reflux tank after condensation, and part of the liquid phase in the reflux tank passes through the first machine. Pump until the rectification tower is refluxed, and the remaining liquid phase in the reflux tank is collected and used to synthesize the kettle; the volume ratio of part of th...

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 rectification tower after passing through the absorption tower in gaseous form, and enters the rectification tower in the absorption tower The liquid phase enters the receiving tank;

[0025] (2) The liquid phase in the receiving tank is recycled to the synthesis kettle, and the heavy components produced at the bottom of the rectification tower are recycled to the synthesis kettle. The gas phase at the top of the rectification tower enters the reflux tank after condensation, and part of the liquid phase in the reflux tank passes through the first machine. Pump until the rectification tower is refluxed, and the remaining liquid phase in the reflux tank is taken out and used to synthesize the kettle; the volume ratio of part of th...

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 rectification tower after passing through the absorption tower in gaseous form, and enters the rectification tower in the absorption tower The liquid phase enters the receiving tank;

[0029] (2) The liquid phase in the receiving tank is recycled to the synthesis kettle, and the heavy components produced at the bottom of the rectification tower are recycled to the synthesis kettle. The gas phase at the top of the rectification tower enters the reflux tank after condensation, and part of the liquid phase in the reflux tank passes through the first machine. The pump is pumped until the rectification tower is refluxed, and the remaining liquid phase in the reflux tank is taken out and used to synthesize the kettle; the volume ratio...

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Abstract

The invention belongs to the technical field of chemical industry production, and in particular relates to a method for producing thionyl chloride. The method comprises the following steps: sulfur dioxide gas and synthetic gas generated by reaction of sulfur and chlorine gas in a synthesis reactor enter a reactor together, the crude product thionyl chloride in a gaseous form generated by reaction in the reactor directly enters a rectifying tower through an absorbing tower; the gas phase at the top of the rectifying tower enters a reflux drum after condensation; the gas phase in the reflux drum enters an evacuated drum through an ejector, and then is cyclically nested back to the synthesis reactor; and a qualified product is obtained in the middle part of the rectifying tower. According to the method for producing thionyl chloride, because the process pipeline is short and a process of condensing regasification is saved, heat in the system can be utilized more sufficiently, and the energy consumption of devices is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a method for producing 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 谢圣斌王荣海毕义霞张善民孙丰春张良张清新张泰铭刘嵩
Owner SHANDONG KAISHENG NEW MATERIALS
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