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Method for preparing ethylene by catalytic dehydration of ethanol

A technology for catalytic dehydration and ethanol aqueous solution, applied in chemical instruments and methods, hydrocarbon production from oxygen-containing organic compounds, physical/chemical process catalysts, etc., can solve the problems of high cost of ethanol dehydration catalysts, low ethylene yield, etc., and achieve inhibition Side reaction, low cost, effect of increasing acid amount and acid strength

Inactive Publication Date: 2011-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the cost of ethanol dehydration catalyst is high and the yield of ethylene is low in the prior art, and a new method for producing ethylene by catalytic dehydration of ethanol is provided

Method used

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  • Method for preparing ethylene by catalytic dehydration of ethanol

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] H 3 Mo 12 o 40 P·nH 2 O is mixed with boehmite, Tianqing powder, and 0.3 mol / liter nitric acid, and the weight ratio of each raw material is H 3 Mo 12 o 40 P / Al 2 o 3 / Tian Qing powder = 0.13: 1: 0.1, shaped into a four-leaf clover shape, 4 mm long, 1.1 mm in diameter of the four-leaf circle, dried at 120° C. for 12 hours, and roasted at 550° C. for 10 hours. Al in the catalyst 2 o 3 The parts by weight of is 88 parts, and the parts by weight of heteropolyacid is 12 parts.

Embodiment 2

[0022] Press each step and condition of [embodiment 1], only H 4 o 40 SiW 12 / Al 2 o 3 / Tianqing powder=0.20:1:0.1, the shape is clover-shaped, 5 mm long, and the diameter of the three-leaf circle is 1 mm. Al in the catalyst 2 o 3 The parts by weight of is 83 parts, and the parts by weight of heteropolyacid is 17 parts.

Embodiment 3

[0024] Press each step and condition of [embodiment 1], only H 3 o 40 PW 12 / Al 2 o 3 / Tianqing powder = 0.20:1:0.1, spherical in shape with a diameter of 3 mm. Al in the catalyst 2 o 3 The parts by weight of is 83 parts, and the parts by weight of heteropolyacid is 17 parts.

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Abstract

The invention relates to a method for preparing ethylene by catalytic dehydration of ethanol and mainly solves the problems in the prior art that a dehydration catalyst of the ethanol has higher cost and the yield of the ethylene is low. For better solving problem, the invention adopts the technical scheme that the ethylene is generated by contacting a reaction raw material of 5-100 weight percent ethanol water solution with a catalyst under the condition that the reaction temperature is 250-500DEG C and the liquid hourly space velocity is 0.1-25 hour<-1> relative to the ethanol, wherein the used catalyst comprises the following components in parts by weight: 0.5-30 parts of heteropoly acid and 70-99.5 parts of alumina; and the heteropoly acid is at least one selected from H3PMo12O40.nH2O, H4SiW12O40.nH2O or H3PW12O40.nH2O. The invention can be applied to the industrial production for preparing the ethylene by catalytic dehydration of ethanol.

Description

technical field [0001] The invention relates to a method for preparing ethylene by catalytic dehydration of ethanol. Background technique [0002] As a basic organic chemical raw material and a leading product in the petrochemical industry, ethylene is known as the "mother of petrochemical industry". It is mainly used in the production of polyethylene, ethylene oxide / ethylene glycol, dichloroethane, styrene, acetic acid Chemicals such as ethylene. With the rapid development of ethylene derivative industries such as chemical industry, energy and materials, the demand for ethylene is increasing. At present, ethylene mainly comes from naphtha cracking. As petroleum resources are non-renewable and are gradually becoming exhausted, the use of renewable biomass resources to develop bioenergy and biochemical industries has become an inevitable trend of current and future economic development. Ethanol can be obtained by fermentation of plant starch or wood fiber. The source of ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C1/24B01J31/26B01J31/18B01J31/16B01J35/02B01J35/00
CPCY02P20/52
Inventor 李亚男徐菁金照生周海春金萍孙兰萍黄祖娟
Owner CHINA PETROLEUM & CHEM CORP
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