The production method of thionyl chloride

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 specifically relates to a production method of thionyl chloride. Background technique

[0002] ZL95110380.6 announced a manufacturing method of thionyl chloride. The method is to cool the crude product of thionyl chloride produced by catalytic synthesis into a distillation kettle with sulfur powder beforehand. Distillation to obtain liquid thionyl chloride product.

[0003] According to the literature, in the preparation process of thionyl chloride, the crude product of thionyl chloride synthesized in the reactor is condensed and then subjected to batch distillation or two-stage distillation column / three-stage distillation column distillation.

[0004] During the preparation of thionyl chloride, the crude product of thionyl chloride in the gas phase from the reactor is condensed and sulfurized, and then the liquid phase is rectified, and the gas phase is recycled to the reaction system; a...

Examples

Embodiment 1

[0020] (1) The synthesis gas produced by the reaction of sulfur and chlorine in the synthesizer enters the reactor together with sulfur dioxide gas, and the crude thionyl chloride generated by the reaction in the reactor directly passes through the absorption tower in gaseous form and then enters the decomposer and 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 recycled to the synthesis kettle, the heavy components generated at the bottom of the rectification tower are recycled back to the synthesis kettle, and the gas phase at the top of the rectification tower is recycled After condensing, it enters the reflux tank. Part of the liquid phase in the reflux tank is pumped to the rectification tower for reflux by the first machine pump. The remaining liquid phase in the reflux tank is extracted and reused in the syn...

Embodiment 2

[0024] (1) The synthesis gas produced by the reaction of sulfur and chlorine in the synthesizer enters the reactor together with sulfur dioxide gas, and the crude thionyl chloride generated by the reaction in the reactor directly passes through the absorption tower in gaseous form and then enters the decomposer and 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 recycled to the synthesis kettle, the heavy components generated at the bottom of the rectification tower are recycled back to the synthesis kettle, and the gas phase at the top of the rectification tower is recycled After condensing, it enters the reflux tank. Part of the liquid phase in the reflux tank is pumped to the rectification tower for reflux by the first machine pump. The remaining liquid phase in the reflux tank is extracted and reused in the syn...

Embodiment 3

[0028] (1) The synthesis gas produced by the reaction of sulfur and chlorine in the synthesizer enters the reactor together with sulfur dioxide gas, and the crude thionyl chloride generated by the reaction in the reactor directly passes through the absorption tower in gaseous form and then enters the decomposer and 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 recycled to the synthesis kettle, the heavy components generated at the bottom of the rectification tower are recycled back to the synthesis kettle, and the gas phase at the top of the rectification tower is recycled After condensing, it enters the reflux tank. Part of the liquid phase in the reflux tank is pumped to the rectification tower for reflux through the first machine pump. The remaining liquid phase in the reflux tank is extracted and reused in th...

Technical field

[0001] The invention belongs to the technical field of chemical production, and specifically relates to a production method of thionyl chloride. Background technique

[0002] ZL95110380.6 announced a manufacturing method of thionyl chloride. The method is to cool the crude product of thionyl chloride produced by catalytic synthesis into a distillation kettle with sulfur powder beforehand. Distillation to obtain liquid thionyl chloride product.

[0003] According to the literature, in the preparation process of thionyl chloride, the crude product of thionyl chloride synthesized in the reactor is condensed and then subjected to batch distillation or two-stage distillation column / three-stage distillation column distillation.

[0004] During the preparation of thionyl chloride, the crude product of thionyl chloride in the gas phase from the reactor is condensed and sulfurized, and then the liquid phase is rectified, and the gas phase is recycled to the reaction system; a...

Examples

Embodiment 1

[0020] (1) The synthesis gas produced by the reaction of sulfur and chlorine in the synthesizer enters the reactor together with sulfur dioxide gas, and the crude thionyl chloride generated by the reaction in the reactor directly passes through the absorption tower in gaseous form and then enters the decomposer and 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 recycled to the synthesis kettle, the heavy components generated at the bottom of the rectification tower are recycled back to the synthesis kettle, and the gas phase at the top of the rectification tower is recycled After condensing, it enters the reflux tank. Part of the liquid phase in the reflux tank is pumped to the rectification tower for reflux by the first machine pump. The remaining liquid phase in the reflux tank is extracted and reused in the syn...

Embodiment 2

[0024] (1) The synthesis gas produced by the reaction of sulfur and chlorine in the synthesizer enters the reactor together with sulfur dioxide gas, and the crude thionyl chloride generated by the reaction in the reactor directly passes through the absorption tower in gaseous form and then enters the decomposer and 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 recycled to the synthesis kettle, the heavy components generated at the bottom of the rectification tower are recycled back to the synthesis kettle, and the gas phase at the top of the rectification tower is recycled After condensing, it enters the reflux tank. Part of the liquid phase in the reflux tank is pumped to the rectification tower for reflux by the first machine pump. The remaining liquid phase in the reflux tank is extracted and reused in the syn...

Embodiment 3

[0028] (1) The synthesis gas produced by the reaction of sulfur and chlorine in the synthesizer enters the reactor together with sulfur dioxide gas, and the crude thionyl chloride generated by the reaction in the reactor directly passes through the absorption tower in gaseous form and then enters the decomposer and 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 recycled to the synthesis kettle, the heavy components generated at the bottom of the rectification tower are recycled back to the synthesis kettle, and the gas phase at the top of the rectification tower is recycled After condensing, it enters the reflux tank. Part of the liquid phase in the reflux tank is pumped to the rectification tower for reflux through the first machine pump. The remaining liquid phase in the reflux tank is extracted and reused in th...

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