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Technology for preparing 1, 1, 2, 3-tetrachloropropene

A tetrachloropropene, production process technology, applied in the field of 1, can solve the problems of many impurities, low tetrachloropropene yield, etc., and achieve the effect of high product content

Inactive Publication Date: 2011-01-26
CAC NANTONG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 1,1,2,3-tetrachloropropene obtained by this method has a low yield and many impurities

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] 1.1, 1,2,3-trichloropropane dehydrochlorination to prepare 2,3-dichloropropene:

[0019] Put 1,2,3-trichloropropane into a 1000ml four-necked bottle, heat it to 75-80°C, and start adding liquid caustic soda dropwise. The dropping temperature is 75-80°C, the dropping time is 1.5 hours, and the temperature is raised to reflux after the dropping is completed. After the reflux is completed, the water-splitting oiler is directly distilled, and the liquid temperature rises to 100°C, and the distillation is stopped.

[0020] 1.2, 2,3-dichloropropene chlorination to prepare 1,2,2,3-tetrachloropropane:

[0021] In the jacketed four-neck flask, add 1,2,2,3-tetrachloropropane as the bottom material, heat to 50°C, start to pass chlorine gas, and simultaneously add 2,3-dichloropropene dropwise (the dropping speed is controlled at 100g / hour), and the reaction temperature is controlled at 50-60°C. After the dropwise addition, the chlorine gas flow was stopped. After keeping warm ...

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PUM

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Abstract

The invention discloses a technology for preparing 1, 1, 2, 3-tetrachloropropene, which comprises the following steps of dehydrochlorinating 1, 2, 3-trichloropropene in the existence of alkali solution to prepare 2, 3-dichloropropene; chlorinating the 2, 3-dichloropropene to prepare 1, 2, 2, 3-tetrachloropropene; dehydrochlorinating the 1, 2, 2, 3-tetrachloropropene in the existence of the alkali solution to prepare the 1, 2, 3-trichloropropene; chlorinating the 1, 2, 3-trichloropropene to prepare 1, 1, 2, 2, 3-pentachloropropene; finely distilling and purifying the prepared 1, 1, 2, 2, 3-pentachloropropene; dehydrochlorinating the 1, 1, 2, 2, 3-pentachloropropene in the existence of the alkali solution to prepare the 1, 1, 2, 3-tetrachloropropene which can be directly used for the fine distillation step (6) for synthesizing triallate to prepare the 1, 1, 2, 3-tetrachloropropene. The invention can ensure that the preparation technology is suitable for industrial production and has high content of products.

Description

Technical field: [0001] The invention relates to a production process of 1,1,2,3-tetrachloropropene. Background technique: [0002] 1,1,2,3-tetrachloropropene is a chemical intermediate, it is reported that 1,2,3-trichloropropane is first chlorinated, and the depth of chlorination is controlled: the conversion rate of trichloropropane is 60%, and the obtained chlorinated mixture is passed through Rectification, the obtained tetrachloropropane dehydrochlorination, generate trichloropropene, and then chlorination to pentachloropropane, and then dehydrochlorination to obtain tetrachloropropene. The 1,1,2,3-tetrachloropropene obtained by this method has a low yield and many impurities. Invention content: [0003] The purpose of the present invention is to provide a 1,1,2,3-tetrachloropropene production process suitable for industrial production and high in product content. [0004] Technical solution of the present invention is: [0005] A kind of 1,1,2,3-tetrachloropropene...

Claims

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Application Information

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IPC IPC(8): C07C21/04C07C17/25
Inventor 田晓宏李建高汤效先
Owner CAC NANTONG CHEM
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