Catalytic hydrodechlorination method for polychlorobenzene

A technology for catalytic hydrogenation and polychlorinated benzene, applied in chemical instruments and methods, catalysts, carbon compound catalysts, etc., can solve the problems of low yield, uneven reaction temperature, concentration, and difficulty in precise control of the reaction process, and achieve optimization. Effects of process conditions

Pending Publication Date: 2022-02-18
SINOPEC NANJING RES INST OF CHEM IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The traditional catalytic hydrogenation of polychlorobenzene is carried out in a tank reactor, which needs to add an acid-binding agent, and the reaction will produce a large amount of saline wastewater. In addition, the tank reactor has slow mass and heat transfer, which may easily cause uneven reaction temperature and concentration , the catalyst needs to be filtered, the separation loss is large, the yield is low, the quality stability of batch products is poor, and the reaction process is difficult to accurately control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Fixed bed reactor, 40 mesh 0.5% palladium carbon catalyst loading 10mL, mixed chlorobenzene composition (weight percent): 1,2,3-Trichlorobenzene 52%, 1,2,4,5-Tetrachlorobenzene 15% %, 1,2,3,4-tetrachlorobenzene 33%, toluene and polychlorobenzene mixed evenly, of which toluene accounts for 15% (weight percentage), and the feed space velocity is controlled to 0.3h -1 , the molar ratio of hydrogen and liquid-phase raw materials is 6:1, the temperature of the catalyst bed is 230°C, and the pressure is 0.2Mpa. After the product and hydrogen mixture are separated by cooling and gas-liquid separation, a mixture of benzene and toluene is obtained, and the gas is dewatered and eluted. Hydrogen chloride gas. Sampling analysis and calculation showed that the conversion rate of polychlorobenzene was 100%.

Embodiment 2

[0025] Fixed bed reactor, 20 mesh 0.5% palladium carbon catalyst loading 10mL, mixed chlorobenzene composition (weight percent): 1,2,3-Trichlorobenzene 52%, 1,2,4,5-Tetrachlorobenzene 15% %, 1,2,3,4-tetrachlorobenzene 33%, toluene and polychlorobenzene mixed evenly, of which toluene accounts for 15% (weight percentage), control the feed space velocity to 0.5h -1 , the molar ratio of hydrogen and liquid-phase raw materials is 10:1, the temperature of the catalyst bed is 280°C, and the pressure is 0.8Mpa. After the product and hydrogen mixture are separated into gas and liquid by cooling, a mixture of benzene and toluene is obtained, and the gas is dewatered and eluted. Hydrogen chloride gas. Sampling analysis and calculation showed that the conversion rate of polychlorobenzene was 100%.

Embodiment 3

[0027] Fixed bed reactor, 40 mesh 0.5% palladium carbon catalyst loading 10mL, mixed chlorobenzene composition (weight percent): 1,2,3-Trichlorobenzene 52%, 1,2,4,5-Tetrachlorobenzene 15% %, 1,2,3,4-tetrachlorobenzene 33%, toluene and polychlorobenzene mixed evenly, of which toluene accounts for 20% (weight percentage), control the feed space velocity to 0.4h -1 , the molar ratio of hydrogen and liquid-phase raw materials is 8:1, the temperature of the catalyst bed is 260°C, and the pressure is 0.6Mpa. After the product and hydrogen mixture are separated by cooling and gas-liquid, a mixture of benzene and toluene is obtained, and the gas is dewatered and eluted. Hydrogen chloride gas. Sampling analysis and calculation showed that the conversion rate of polychlorobenzene was 100%.

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Abstract

The invention provides a method for comprehensively utilizing mixed polychlorobenzene. The method comprises the following steps: by taking toluene as a solvent, palladium on carbon as a catalyst and a fixed bed as a reactor, dechlorination is carried out by mixing a polychlorobenzene hydrogenation catalyst to generate benzene and hydrogen chloride. According to the method, the conversion rate of polychlorobenzene is 100%, the product is single and easy to separate, and the technological process is simple and easy to operate.

Description

technical field [0001] The invention relates to a production process of chlorobenzene and its downstream products, and belongs to the fields of pesticides and fine chemicals. Background technique [0002] In the production of chlorobenzene or dichlorobenzene by catalyzed chlorination of benzene, polychlorobenzene by-products will inevitably be generated, including trichlorobenzene, tetrachlorobenzene, etc., 1,2,4-trichlorobenzene in polychlorobenzene Benzene has multiple uses after purification, while polychlorinated benzene with other structures has little use and the market demand is very small. [0003] Therefore, more and more polychlorobenzenes are accumulated in production, which not only pollutes the environment but also takes up space, which has become a great burden on the production of chlorobenzene industry. [0004] The current treatment method for chlorinated hydrocarbon waste is incineration. Incineration will cause air pollution due to the production of a lar...

Claims

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Application Information

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IPC IPC(8): C07C15/04C07C1/26
CPCC07C1/26C07C2523/44C07C15/04
Inventor 赵思远季峰崎杨忠林丁红霞张蓉蓉
Owner SINOPEC NANJING RES INST OF CHEM IND CO LTD
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