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Method for preparing propylene from ethanol

A technology of ethanol and propylene, which is applied in the field of preparing propylene from ethanol, can solve the problem of low selectivity of propylene, and achieve the effects of increased selectivity, improved reactivity, and good technical effects

Active Publication Date: 2013-01-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • 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 problem of low selectivity of the target product propylene in the prior art, and a new method for preparing propylene from ethanol is provided

Method used

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  • Method for preparing propylene from ethanol

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Effect test

Embodiment 1

[0019] Send 95% (weight content) of ethanol material 1 to ethanol dehydration reactor 31, and the ethanol in γ-Al 2 O 3 Under the action of the catalyst, the reaction mass space velocity is 0.5 hours at 420℃ -1 The reaction pressure is 0.05MPa to obtain ethylene-containing material 2 with 98% ethylene weight content. The ethylene-containing material 2 is mixed with fresh ether and carbon four 3 to form material 4, and the mixed material 4 enters the reactor 32 for disproportionation reaction , Ethylene and ether after carbon four in 8%WO 3 / SiO 2 Under the action of magnesium oxide, at 300℃, the reaction pressure is 0.5MPa, the mass space velocity of carbon four is 6 hours -1 Under the conditions, the propylene-containing material 5 is obtained, and the material 5 is passed through the deethylene tower 33 and the depropylene tower 34 in order to fractionate unreacted ethylene and the reaction product propylene 7, wherein at least part of the ethylene 6 is recycled to be mixed with...

Embodiment 2

[0021] Send 95% (weight content) of ethanol material 1 to ethanol dehydration reactor 31, and the ethanol in γ-Al 2 O 3 Under the action of the catalyst, the reaction mass space velocity is 0.7 hours at 450℃ -1 The reaction pressure is 0.02MPa to obtain an ethylene-containing material 2 with an ethylene weight content of 97%. The ethylene-containing material 2 is mixed with fresh ether and carbon four 3 to form a material 4, and the mixed material 4 enters the reactor 32 for disproportionation reaction , Ethylene and ether after carbon four in 8%WO 3 / SiO 2 Under the action of magnesium oxide, at 320℃, the reaction pressure is 0.3MPa, the mass space velocity of carbon four is 4 hours -1 Under the conditions, the propylene-containing material 5 is obtained, and the material 5 is passed through the deethylene tower 33 and the depropylene tower 34 in order to fractionate unreacted ethylene and the reaction product propylene 7, wherein at least part of the ethylene 6 is recycled to be...

Embodiment 3

[0023] Send 95% (weight content) of ethanol material 1 to ethanol dehydration reactor 31, and the ethanol in γ-Al 2 O 3 Under the action of the catalyst, the reaction mass space velocity is 0.2 hours at 470℃ -1 The reaction pressure is 0.8MPa to obtain ethylene-containing material 2 with an ethylene content of 97.5% by weight. The ethylene-containing material 2 is mixed with fresh ether and carbon four 3 to form material 4, and the mixed material 4 enters the reactor 32 for disproportionation reaction , Ethylene and ether after carbon four in 8%WO 3 / SiO 2 Under the action of magnesium oxide, at 275℃, the reaction pressure is 0.1MPa, the mass space velocity of carbon four is 8 hours -1 Under the conditions, the propylene-containing material 5 is obtained, and the material 5 is passed through the deethylene tower 33 and the depropylene tower 34 in order to fractionate unreacted ethylene and the reaction product propylene 7, wherein at least part of the ethylene 6 is recycled to be ...

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Abstract

The invention relates to a method for preparing propylene from ethanol, mainly solving the problem of low propylene selectivity in the prior art. The method adopts ethanol and etherified C4 as raw materials, and comprises the following steps: (1)reacting ethanol under the effect of a dehydration catalyst to generate an ethene-containing flow I; (2) contacting the flow I with etherified C4 under the effect of an isomerization catalyst to generate a flow II; (3) contacting the flow II with a disproportionation catalyst to generate a reaction product flow III containing ethene, propylene, butylene and trace C5; (4) separating the follow III through a deethylenizer to obtain ethene at the top and a flow IV containing propylene, butylene and trace C5 at the bottom; and (5) separating the flow IV through a depropenizer to obtain propylene at the top and butylene and trace C5 at the bottom. The method disclosed herein well solves the problems and can be applied in the industrial production of preparing propylene from ethanol.

Description

Technical field [0001] The invention relates to a method for preparing propylene from ethanol. Background technique [0002] In recent years, with the continuous development of the global economy, the market demand for light olefins (including ethylene, propylene, etc.) will continue to increase. Propylene is one of the most important basic organic raw materials second only to ethylene in scale. Its largest use is the production of polypropylene (about half of its total), followed by the production of acrylonitrile, propylene oxide, isopropanol, and cumene. , Carbonyl alcohol, acrylic acid, propylene oligomer. [0003] US4302357 relates to the use of alumina catalysts in the process of producing ethylene from the dehydration reaction of ethanol. In the instructions, the LHSV of ethanol is 0.25~5h -1 , Preferably 0.5~3h -1 .Example of implementation 370℃, 10kg / cm 2 Pressure and 1h -1 Under LHSV, the ethylene selectivity is 99.3%. [0004] WO2007083241A2 describes a method for the p...

Claims

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Application Information

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IPC IPC(8): C07C11/06C07C6/04
Inventor 宣东王仰东刘苏
Owner CHINA PETROLEUM & CHEM CORP
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