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Process for production of chloroethylene by acetylene and dichloroethane catalytic reforming

A technology of dichloroethane and catalytic reforming, which is applied in the fields of organic chemistry, dehydrohalogenation preparation, hydrogen halide addition preparation, etc., can solve the problems of increased cost and many process equipment, and achieves increased inert gas content and improved reaction Efficiency, the effect of increasing investment

Active Publication Date: 2015-02-04
ZHONGKE YIGONG SHANGHAI CHEM TECH CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the rectification, condensation and vaporization of dichloroethane require energy consumption, and there are many process equipments, the cost increases

Method used

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  • Process for production of chloroethylene by acetylene and dichloroethane catalytic reforming
  • Process for production of chloroethylene by acetylene and dichloroethane catalytic reforming

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Gas phase dichloroethane (purity: wt=99.93%) from the dichloroethane rectifying tower top and raw material acetylene and the recycle gas (weight composition (wt %) from the spray tower top: vinyl chloride=1.94% , ethylene dichloride=3.83%, acetylene=49.06%, hydrogen chloride=19.45%, nitrogen oxide=25.71%; impurity 0.01%) by weight 83.36%: 10.55%: 6.09% after mixing in the gas mixing tank, by total The flow rate is 26398.23kg / h (the mixed gas volume per ton of catalyst is 4.224 tons per day), and it enters the 5-stage chilled fixed-bed reactor (inlet temperature 188°C, outlet temperature 230°C, with activated carbon-supported barium chloride catalyst inside, The pressure of each stage is controlled at 0.8MPa); liquid dichloroethane (temperature 25°C) is used to perform a cold shock between the two stages of reaction.

[0076] Reaction product (flow rate: 31917.54kg / h, weight composition (wt%): vinyl chloride=39.85%, dichloroethane=54.71%, acetylene=2.75%, hydrogen chlori...

Embodiment 2

[0081] Gas phase dichloroethane (purity: wt=99.93%) from dichloroethane rectifying tower top and raw material acetylene and the recycle gas (weight composition (wt %) from spray tower top: vinyl chloride=2.99% , ethylene dichloride=2.64%, acetylene=41.96%, hydrogen chloride=19.75%, nitrogen oxide=32.66%;) After mixing in the gas mixing tank by weight ratio 80.46:10.42:9.12, according to the total flow rate of 30486.84kg / h Processing speed (4.878 tons of mixed gas per ton of catalyst per day), enter the 5-stage chilled fixed-bed reactor (inlet temperature 195°C, outlet temperature 234°C, built-in carbon-supported barium chloride catalyst, the pressure of each stage is controlled at 0.8 MPa); liquid dichloroethane (temperature 25° C.) was used to perform a cold shock between the two stages of the reaction.

[0082] Reaction product (flow rate: 34014.08kg / h, weight composition (wt%): vinyl chloride=42.92%, dichloroethane=48.53%, acetylene=3.61%, hydrogen chloride=1.70%, nitrogen ...

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Abstract

The invention relates to a process for production of chloroethylene by acetylene and dichloroethane catalytic reforming; dichloroethane as an absorbent is used for spray absorption of the chloroethylene in noncondensable gas from compression condensing section of the process for production of the chloroethylene by acetylene and dichloroethane mercury-free catalytic synthesis, then the excessive dichloroethane in the reaction and the dichloroethane spray-absorbing the chloroethylene are sent into a dichloroethane rectifying tower for refining, a gas phase dichloroethane discharge material at the dichloroethane rectifying tower top is used as a raw material for the process for production of the chloroethylene by acetylene and dichloroethane catalytic mercury-free catalytic synthesis; dichloroethane recovery distillation and reaction dichloroethane feeding vaporization can be realized, by use of the dichloroethane as the absorbent for spray absorption, no third party impurity is introduced; after spray recovery of the chloroethylene, the tail gas emission ratio can be further reduced, so that the up-to-standard tail gas emission is easier to achieve.

Description

technical field [0001] The invention relates to a new process for the catalytic reforming of acetylene and ethylene dichloride to produce vinyl chloride, in particular to a process for acetylene and ethylene dichloride in which ethylene dichloride is sprayed to absorb vinyl chloride and ethylene dichloride is rectified and vaporized. A new process for the production of vinyl chloride by catalytic reforming of alkane. Background technique [0002] At present, the methods for producing vinyl chloride include acetylene method, ethylene oxychlorination method, acetylene and dichloroethane catalytic reforming method. Among them, ethylene method, acetylene and dichloroethane catalytic reforming method all use dichloroethane as raw material to produce vinyl chloride. [0003] The process flow of ethylene equilibrium oxychlorination method includes ethylene direct chlorination unit, ethylene oxychlorination unit, dichloroethane rectification unit, dichloroethane vapor cracking unit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C21/06C07C17/38C07C17/383C07C17/25C07C17/08
Inventor 王勤获江政辉梁鹏贵刘星钟劲光
Owner ZHONGKE YIGONG SHANGHAI CHEM TECH CO LTD
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