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Method for producing ethylene by dehydration of ethanol

A technology for ethanol dehydration and ethylene, applied in ethylene production, chemical instruments and methods, biological raw materials, etc., can solve the problems of low utilization rate of catalyst, uneven distribution of reaction gas, poor reaction performance, etc., to improve utilization rate and reaction Efficiency, uniform gas distribution, good technical results

Active Publication Date: 2020-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the uneven distribution of reaction gas, low catalyst utilization rate and poor reaction performance in the previous ethanol dehydration production ethylene process. A new adiabatic fixed bed for ethanol dehydration production ethylene is provided Reactor and reaction process

Method used

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  • Method for producing ethylene by dehydration of ethanol
  • Method for producing ethylene by dehydration of ethanol
  • Method for producing ethylene by dehydration of ethanol

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Experimental program
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Effect test

Embodiment 1

[0020] The dehydration of ethanol to produce ethylene adopts such as figure 1 (a) shown in the four-stage adiabatic reaction process, the reactor adopts such as image 3 In the structure of the gas distributor shown, the ethanol feed rates of the first to fourth reactors are 600kg / hr, 500kg / hr, 400kg / hr, and 300kg / hr respectively, and water vapor is added from the front of the first heater. The inner diameter of the reactor is 1600mm, the inner diameter of the distributor cylinder is 170mm, the corrugated top angle of the corrugated single-stage baffle is 110°, the peak height is 15mm, the diameter of the sieve hole is 5mm, the opening rate is 18.9%, and the lateral ring The channel height is 80mm, and the homogenization space height is 1400mm. The reaction inlet temperature of each stage is 440°C, the reaction pressure is 0.3MPaG, the water / total ethanol mass ratio is 0.8, and the conversion rate of ethanol is 99.5% and the yield of ethylene is 97.5% by using alumina catalys...

Embodiment 2

[0022] The dehydration of ethanol to produce ethylene adopts such as figure 1 (a) shown in the four-stage adiabatic reaction process, the reactor adopts such as image 3 In the structure of the gas distributor shown, the ethanol feed rates of the first to fourth reactors are 600kg / hr, 500kg / hr, 400kg / hr, and 300kg / hr respectively, and water vapor is added from the front of the first heater. The inner diameter of the reactor is 1600mm, the inner diameter of the distributor cylinder is 170mm, the corrugated top angle of the corrugated single-stage baffle is 81°, the peak height is 50mm, the diameter of the sieve hole is 5mm, the opening rate is 18.9%, and the lateral ring The channel height is 80mm, and the homogenization space height is 1400mm. The reaction inlet temperature of each stage is 440°C, the reaction pressure is 0.3MPaG, the water / total ethanol mass ratio is 0.8, and the conversion rate of ethanol is 99.2% and the yield of ethylene is 97.3% by using alumina catalyst...

Embodiment 3

[0024] The dehydration of ethanol to produce ethylene adopts such as figure 1 (a) shown in the four-stage adiabatic reaction process, the reactor adopts such as image 3In the structure of the gas distributor shown, the ethanol feed rates of the first to fourth reactors are 600kg / hr, 500kg / hr, 400kg / hr, and 300kg / hr respectively, and water vapor is added from the front of the first heater. The inner diameter of the reactor is 1600mm, the inner diameter of the distributor cylinder is 170mm, the corrugated top angle of the corrugated single-stage baffle is 110°, the peak height is 15mm, the diameter of the sieve hole is 5mm, the opening rate is 18.9%, and the lateral ring The channel height is 35mm, and the homogenization space height is 1400mm. The reaction inlet temperature of each stage is 440°C, the reaction pressure is 0.3MPaG, the water / total ethanol mass ratio is 0.8, and the conversion rate of ethanol is 99.0% and the yield of ethylene is 97.1% by using alumina catalyst...

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Abstract

The present invention relates to a method for producing ethylene through ethanol dehydration. A purpose of the present invention is mainly to solve the problems of non-uniform gas flow distribution in the reactor, low catalyst utilization rate and poor reaction performance in the previous ethylene production technology using ethanol dehydration. The technical scheme of the present invention is that a thermal insulation fixed bed reaction having a special structure and the a multi-stage thermal insulation reaction process are used, the corrugated vertex angle of the corrugated single-stage baffle of a reactor inlet gas distributor is 80-175 DEG, the peak height is 1-30% of the diameter of the cylindrical cylinder of the gas distributor, the opening rate is 10-55%, and the lateral annular channel height is 15-70% f the diameter f the cylindrical cylinder of the gas distributor. With the technical scheme of the present invention, the problems in the prior art are well solved. The method of the present invention can be used for ethylene production through ethanol dehydration.

Description

technical field [0001] The invention relates to a method for producing ethylene by dehydrating ethanol. Background technique [0002] Ethylene is a very important basic petrochemical raw material, and its bulk downstream products mainly include polyethylene, polyvinyl chloride, ethylene oxide, ethylene glycol, styrene, vinyl acetate, etc. [0003] At present, ethylene is mainly produced by pyrolysis method using petroleum as raw material at home and abroad. With the decreasing of petroleum resources and the rising of international oil price, the petroleum route to ethylene will face unprecedented challenges. Many petrochemical companies in the world are actively exploring other routes, including the production of olefins by using coal, natural gas, and biomass raw materials to reduce the excessive dependence of ethylene on limited petroleum resources. [0004] Using renewable biomass raw materials to produce ethanol, and then dehydration to ethylene technology is one of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/20C07C11/04B01J8/02
CPCY02P30/20Y02P30/40
Inventor 陈伟沈伟马丽丽
Owner CHINA PETROLEUM & CHEM CORP