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Method for preparing propylene from methanol

A technology for the production of propylene and propylene from methanol, which is applied in chemical instruments and methods, purification/separation of hydrocarbons, and production of hydrocarbons from oxygen-containing organic compounds. It can solve the problems of short catalyst regeneration cycle, difficult catalyst control, and low propylene yield, etc. problems, achieve the effect of shortening the operation cycle, increasing the yield of propylene, and improving the selectivity and yield

Active Publication Date: 2013-01-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is that the existing fixed bed process has the problems of short catalyst regeneration period and low propylene yield, and the existing moving bed process has the problems of difficulty in controlling the continuous coking of the catalyst and complicated process. A new method of methanol to propylene

Method used

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  • Method for preparing propylene from methanol
  • Method for preparing propylene from methanol
  • Method for preparing propylene from methanol

Examples

Experimental program
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Effect test

Embodiment 1

[0037] according to image 3 As shown, the methanol to propylene reaction uses ZSM-5 catalyst, the reaction pressure is 0.1MPa(G), the reaction inlet temperature is 450°C, and the reaction weight space velocity is 6 hours -1 , C 2 and the following logistics and C 4 ~C 5 The circulation ratio of the stream is 0.9; the hydrogenation reaction uses a nickel-based catalyst, the reaction pressure is 2.0MPa(G), the reaction inlet temperature is 50°C, and the reaction weight space velocity is 1 hour -1 , add hydrogen to ensure that the excess hydrogen is 25% (molar ratio). Feed stream 01 composition (weight %) is: 20% methanol, 57.5% dimethyl ether, 22.5% water; 4 ~C5 The composition of stream 26 (% by weight): 74.6% C 4 (excluding alkynes and dienes), 25.4% C 5 (excluding alkynes and dienes), 50 ppm alkynes and dienes; cyclic C 2 The composition (% by weight) of the following stream 12 is: 66.8% C 2 , 32.9% methane, 0.2% hydrogen, 0.1% CO X . After adopting the method of t...

Embodiment 2

[0039] according to image 3 As shown, the methanol to propylene reaction uses ZSM-5 catalyst, the reaction pressure is 0.07MPa(G), the reaction inlet temperature is 430°C, and the reaction weight space velocity is 2 hours -1 , C 2 and the following logistics and C 4 ~C 5 The circulation ratio of the stream is 1.5; the hydrogenation reaction uses a nickel-based catalyst, the reaction pressure is 1.5MPa(G), the reaction inlet temperature is 70°C, and the reaction weight space velocity is 1 hour -1 , add hydrogen to ensure that the excess hydrogen is 20% (molar ratio). Feed stream 01 composition (weight) is: 15% methyl alcohol, 47.5% dimethyl ether, 37.5% water; 4 ~C 5 The composition (weight) of stream 26 is: 74.6% C 4 (excluding alkynes and dienes), 25.4% C 5 (excluding alkynes and dienes), 50 ppm alkynes and dienes; cyclic C 2 The composition (weight) of following stream 12 is: 53.5%C 2 , 43.5% methane, 0.7% hydrogen, 0.3% CO X . After adopting the method of the pr...

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Abstract

The invention relates to a method for preparing propylene from methanol and mainly solves the problem that a present fixed bed technology has disadvantages of short catalyst regeneration period and low propylene yield and a present moving bed technology has disadvantages of large difficulty in continuous coke-burning control of a catalyst and complex flow. According to the method, C5 and the following hydrocarbons obtained from separation of methanol conversion reaction products are subjected to selective hydrogenation treatment, highly unsaturated hydrocarbons such as alkadiene, alkyne and the like are selectively converted into corresponding olefins, and the olefins are recycled. By the adoption of the technical scheme, the above problem is solved well. The method provided by the invention can be applied in industrial production of propylene from methanol.

Description

technical field [0001] The invention relates to a process for producing propylene from oxygen-containing compounds, in particular to a pre-hydrogenation process for producing propylene from methanol. Background technique [0002] Propylene is one of the basic raw materials of modern organic chemical industry. Due to the increasing demand for propylene derivatives such as polypropylene, acrylonitrile, cumene, and propylene oxide, the corresponding demand for propylene is also growing rapidly. At present, ethylene and propylene are mainly obtained through the process route using petroleum as raw material, while propylene mainly comes from the by-product of petroleum steam cracking process and catalytic cracking process. Since propylene is mainly obtained as a by-product, the output of propylene product is often limited by the output of the main product of its process. Since the demand for propylene has been higher than that of ethylene in recent years, in order to produce or...

Claims

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Application Information

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IPC IPC(8): C07C11/06C07C1/20C07C7/163C07C7/167
CPCY02P20/52Y02P20/584
Inventor 胡春胡帅李俊杰何志黄云群
Owner CHINA PETROLEUM & CHEM CORP
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