Recovering and purifying device and recovering method of thionyl chloride in acyl chloride production

A thionyl chloride, purification device technology, applied in the direction of thionyl chloride, sulfur and halogen compounds, etc., can solve the problems of production capacity control, increase recycling cost, unsuitable for popularization and use, etc., achieve effective separation, realize automatic control, Reasonable effect of structural design

Active Publication Date: 2015-01-07
YANTAI YUXIANG FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the method disclosed in patent CN102992276A, sulfur and activated carbon are required, which increases the cost of recycling, and the reaction is intermittent, and the production capacity is controlled, so it is not suitable for popularization and use.

Method used

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  • Recovering and purifying device and recovering method of thionyl chloride in acyl chloride production

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Effect test

Embodiment 1

[0021] A recovery and purification device for thionyl chloride in the production of acyl chlorides of this embodiment, refer to the attached figure 1 , including an evaporating device, a thionyl chloride delightening tower 3, and a thionyl chloride refining tower 4 connected in series, the evaporating device is provided with an acid chloride synthesis liquid inlet 11, and the thionyl chloride delightening tower 3 is provided with a chlorination Thionoxide crude product inlet 12 and heavy component discharge port 19, Thionyl chloride refining tower 4 is provided with heavy component inlet 13, evaporation device is connected with thionyl chloride crude product inlet 12 through pipeline, heavy component discharge port 19 is communicated with the heavy component inlet 13 through a pipeline; the delightening tower 3 of the sulfur oxychloride includes a delightening tower heating device 5 assembled and connected sequentially from bottom to top, a thionyl chloride rectifying tower I14...

Embodiment 2

[0024] The recovery purification method of thionyl chloride in the production of isophthaloyl chloride of the present embodiment is as follows:

[0025] Among them, the synthetic liquid of isophthaloyl dichloride includes: 75% of isophthaloyl dichloride, 23% of thionyl chloride, and 2% of other components.

[0026] The synthesis liquid of isophthaloyl chloride enters the two-stage evaporation unit connected in series, the temperature of the evaporation tank in the evaporation device is controlled to 100°C, and the pressure of the separation tank is 30KPa. Since the boiling point of thionyl chloride is lower than that of acid chloride, the separation of the two is realized. The thionyl chloride vapor phase enters the thionyl chloride light removal tower 3, and the isophthaloyl chloride synthesis liquid from which the thionyl chloride is removed enters the acyl chloride continuous rectification system 18. Ceramic corrugated packing is housed in the light removal tower 3 of thion...

Embodiment 3

[0028] The recovery and purification method of thionyl chloride in the production of terephthaloyl chloride of the present embodiment is as follows:

[0029] Among them, the synthetic solution of terephthaloyl dichloride includes: 70% of isophthaloyl dichloride, 28% of thionyl chloride, and 2% of other components.

[0030] The terephthaloyl chloride synthetic liquid enters the two-stage evaporation unit connected in series, and the temperature of the evaporation tank in the evaporation device is controlled to 110°C, and the pressure of the separation tank is 20KPa. Since the boiling point of thionyl chloride is lower than that of acid chloride, the separation of the two is realized. The thionyl chloride vapor phase enters the thionyl chloride light removal tower 3, and the isophthaloyl chloride synthesis liquid from which the thionyl chloride is removed enters the acyl chloride continuous rectification system 18. Ceramic corrugated packing is housed in the light removal tower ...

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Abstract

The invention relates to a recovering and purifying device and a recovering and purifying method of thionyl chloride in acyl chloride production and belongs to the technical field of recovery and purification of thionyl chloride. The device comprises an evaporating device, a thionyl chloride light-component-removal tower and a thionyl chloride refining tower which are sequentially connected in series. The recovering method of thionyl chloride in acyl chloride production comprises the following steps: 1) introducing an acyl chloride synthetic liquid into the evaporating device to be heated; 2) introducing the liquid into the thionyl chloride light-component-removal tower, wherein the light components vaporized are condensed by a condensing device of the light-component-removal tower arranged at the top of the tower into a liquid phase which returns to the light-component-removal tower by virtue of a return tank of the light-component-removal tower; and 3) conveying to the thionyl chloride refining tower for further purification, wherein steam rises to the top of the thionyl chloride refining tower, and the synthetic liquid which is condensed to liquid phase partially returns to the thionyl chloride refining tower and is partially discharged and collected as a thionyl chloride product. The device provided by the invention is reasonable in structural design, can be used for effectively recovering thionyl chloride, can be used for continuous treatment and is simple, convenient to operate and easy for control on the process.

Description

technical field [0001] The invention relates to a recovery and purification device and recovery method of thionyl chloride in the production of acid chlorides, and belongs to the technical field of recovery and purification of thionyl chloride. Background technique [0002] In the process of producing acid chlorides by the thionyl chloride method, excess thionyl chloride is usually used, and then recycled after the reaction is finished. This part of thionyl chloride recovered usually contains impurity components such as acid chloride, carboxylic acid, DMF, sulfur monochloride, sulfur dichloride, etc., and the color is dark yellow, and the active ingredient of thionyl chloride is about 90%. The color is very dark and the purity is low, so it can't be used anymore. Therefore need to adopt a process to purify thionyl chloride so that it can be reused. [0003] The method disclosed in the patent CN102992276A needs to use sulfur and activated carbon, etc., which increases the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/45
CPCC01B17/4584
Inventor 赵义旭邹志华王超李卫杨佳云吴运伟
Owner YANTAI YUXIANG FINE CHEM
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