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Production technology of high purity phosgene with low hydrogen chloride content

A production process, hydrogen chloride technology, applied in the direction of carbonyl chloride, etc., can solve problems such as hydrogen chloride condensation, achieve the effect of simplifying the process and reducing manufacturing equipment

Inactive Publication Date: 2011-05-18
QINGDAO UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that most of the hydrogen chloride will condense along with the phosgene

Method used

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  • Production technology of high purity phosgene with low hydrogen chloride content
  • Production technology of high purity phosgene with low hydrogen chloride content
  • Production technology of high purity phosgene with low hydrogen chloride content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The rectification tower 1 is a packed tower with three theoretical plates. The phosgene-rich mixed gas S1 from the phosgene synthesizer has a flow rate of 50kg / h, a temperature of 65°C, and a pressure of 0.5MPa. The composition is: 97.16% phosgene, 2.23% carbon monoxide, 0.21% hydrogen chloride, and 0.21% nitrogen , 0.14% of carbon dioxide and 0.05% of other inert gases, S1 enters from the third plate of rectification tower 1, the operating pressure of rectification tower 1 is 0.45MPa, and the reflux ratio is 20. The phosgene product S2 is obtained at the bottom of the rectifying tower 1 .

[0026] There is a partial condenser 2 on the top of the rectification tower 1, and the liquid phase provides reflux. The mixed gas S3 passes through the absorption tower 3. The absorption tower 3 is a packed tower with 3 theoretical plates, and the phosgene in it is further recovered with toluene. The absorption tower The exhaust S6 at the top of the tower 3 is sent to tail gas tre...

Embodiment 2

[0033] The rectification tower 1 is a packed tower with 5 theoretical plates. The phosgene-rich mixed gas S1 flow rate from the phosgene synthesizer is 50kg / h, the temperature is 65°C, and the pressure is 0.5MPa, and the composition is phosgene 97.16%, carbon monoxide 2.23%, hydrogen chloride 0.21%, nitrogen 0.21%, Carbon dioxide 0.14% and other inert gases 0.05%, S1 enters from the 5th plate of the rectification tower 1, the operating pressure of the rectification tower 1 tower is 0.45MPa, and the reflux ratio is 24. The phosgene product S2 is obtained at the bottom of the rectifying tower 1 .

[0034] There is a fractional condenser 2 at the top of rectification tower 1, and the liquid phase provides reflux, and the mixed gas S3 passes through absorption tower 3. The exhaust gas S6 is sent to tail gas treatment, and the phosgene solution S5 recovered from the bottom of the absorption tower 3 can be further purified or destroyed according to the needs of the process. The pr...

Embodiment 3

[0041] The rectification tower 1 is a packed tower with 10 theoretical plates. The phosgene-rich mixed gas S1 from the phosgene synthesizer has a flow rate of 50kg / h, a temperature of 65°C, and a pressure of 0.5MPa. The composition is: 97.16% phosgene, 2.23% carbon monoxide, 0.21% hydrogen chloride, and 0.21% nitrogen , carbon dioxide 0.14% and other inert gases 0.05%, S1 enters from the 10th plate of the rectification tower 1, the operating pressure of the rectification tower 1 tower is 0.45MPa, and the reflux ratio is 18. The phosgene product S2 is obtained at the bottom of the rectifying tower 1 .

[0042] There is a partial condenser 2 on the top of the rectification tower 1, and the liquid phase provides reflux. The mixed gas S3 passes through the absorption tower 3. The theoretical plate number of the absorption tower 3 is 10, and the phosgene therein is further recovered with dichloromethane. The absorption tower 3 The exhaust S6 at the top is sent to tail gas treatmen...

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Abstract

The invention relates to a production technology of high purity phosgene with low hydrogen chloride content. The production technology comprises the following operation steps: the mixed gas with rich phosgene, unreacted excessive carbon monoxide and other impurities enters at least one rectifying tower, the top of each rectifying tower is provided with a fractional condenser, the liquid phase is used for refluxing, most of hydrogen chloride is discharged from the top of the rectifying tower along with CO and high purity phosgene is obtained at the bottom of the rectifying tower; and the gas discharged from the top of the rectifying tower passes through at least one absorption tower to wash away and recycle phosgene. The production technology in the invention has simple process flow and low production cost and is convenient to operate; and the hydrogen chloride content of the obtained phosgene product is greatly reduced, the purity of phosgene is more than 99.90% and the obtained phosgene can be used for the products using phosgene as a raw material such as isocyanate and polycarbonate and the like.

Description

Technical field: [0001] The invention relates to a production process of high-purity phosgene with low hydrogen chloride content, in particular to a method for purifying phosgene by removing hydrogen chloride from a mixture of phosgene generated by the reaction of carbon monoxide and chlorine. Background technique: [0002] Phosgene is an important organic intermediate, which has many uses in pesticides, medicine, engineering plastics, polyurethane materials and military, especially the important raw materials for the production of isocyanate and polycarbonate. [0003] In industry, phosgene is usually obtained by reacting carbon monoxide (CO) and chlorine in the presence of a catalyst. This method can be found in Ullmann's Encyclopedia of Industrial Chemistry (fifth edition, volume A19, p. 413) at the earliest. The reaction mechanism is as follows: [0004] [0005] The content of impurities contained in the phosgene produced by this method varies according to the diffe...

Claims

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Application Information

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IPC IPC(8): C01B31/28C01B32/80
Inventor 杨霞岳金彩郑世清强光明张伟罗代晏
Owner QINGDAO UNIV OF SCI & TECH
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