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Method for synthesizing propylene by using methanol

A technique for synthesizing methanol and propylene, applied in chemical instruments and methods, producing hydrocarbons from oxygen-containing organic compounds, molecular sieve catalysts, etc., can solve the problems of inability to meet the needs of industrial applications, low propylene selectivity, and low propylene selectivity. Achieve the effect of improving service life, slow catalyst deactivation and high conversion rate

Active Publication Date: 2013-08-14
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for synthesizing propylene from methanol in view of the problems that the existing methanol-to-propylene technology has low propylene selectivity, cannot meet the needs of industrial applications, and the subsequent separation is difficult
The present invention uses aqueous methanol as a raw material to provide a method for synthesizing propylene from methanol. The present invention can effectively solve the problem of low selectivity of propylene in existing methods for producing propylene from methanol, thereby reducing the difficulty of subsequent separation, reducing production costs, and improving economic efficiency of the enterprise

Method used

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  • Method for synthesizing propylene by using methanol
  • Method for synthesizing propylene by using methanol
  • Method for synthesizing propylene by using methanol

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Add methanol solution to the first fixed bed reactor, catalyze with dimethyl ether catalyst, the mass ratio of water to methanol in the added methanol solution is 2:1, and the mass space velocity of the methanol solution is 1h -1 The reaction temperature catalyzed by the dimethyl ether catalyst is 300°C, and the reaction produces an intermediate mixture. Among them, the dimethyl ether catalyst used was purchased from Southwest Chemical Research and Design Institute Co., Ltd.

[0040] The intermediate mixture is sent to the second fixed-bed reactor, and the ZSM-5 molecular sieve catalyst with a silicon-to-aluminum ratio of 50 is used for catalytic reaction. The temperature in the second fixed-bed reactor is 400°C and the pressure is increased to 0.1MPa to produce a mixture Hydrocarbon, the amount of catalyst used is 10 grams.

[0041] The mixed hydrocarbons are sent to the separator for separation, propylene is separated, and the remaining components are returned to the secon...

Embodiment 2

[0045] Add methanol solution to the first fixed bed reactor, catalyze with dimethyl ether catalyst, the mass ratio of water to methanol in the added methanol solution is 2:1, and the mass space velocity of the methanol solution is 1h -1 The reaction temperature catalyzed by the dimethyl ether catalyst is 300°C, and the reaction produces an intermediate mixture. Among them, the dimethyl ether catalyst used was purchased from Southwest Chemical Research and Design Institute Co., Ltd.

[0046] The intermediate mixture is sent to the second fixed-bed reactor, and a ZSM-5 molecular sieve catalyst with a silicon-to-aluminum ratio of 75 is used for catalytic reaction. The temperature in the second fixed-bed reactor is 420 ℃ and the pressure is increased to 0.05 MPa to produce a mixture Hydrocarbon, the amount of catalyst used is 10 grams.

[0047] The mixed hydrocarbons are sent to the separator for separation, propylene is separated, and the remaining components are returned to the secon...

Embodiment 3

[0051] Add methanol solution to the first fixed bed reactor, catalyze with dimethyl ether catalyst, the mass ratio of water to methanol in the added methanol solution is 2:1, and the mass space velocity of the methanol solution is 1h -1 The reaction temperature catalyzed by the dimethyl ether catalyst is 300°C, and the reaction produces an intermediate mixture. Among them, the dimethyl ether catalyst used was purchased from Southwest Chemical Research and Design Institute Co., Ltd.

[0052] The intermediate mixture is sent to the second fixed bed reactor, and the ZSM-5 molecular sieve catalyst with a silicon-to-aluminum ratio of 250 is used for catalytic reaction. The temperature in the second fixed bed reactor is 490 ℃ and the pressure is increased to 0.5 MPa to produce a mixture Hydrocarbon, the amount of catalyst used is 10 grams.

[0053] The mixed hydrocarbons are sent to the separator for separation, propylene is separated, and the remaining components are returned to the sec...

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Abstract

The invention discloses a method for synthesizing propylene by using methanol, for solving the problems that in the existing technique for preparing propylene by using methanol, the selectivity of propylene is low and cannot meet the requirement of industrial application and subsequent separation is very difficult. The method disclosed by the invention comprises the following steps of: preparing an intermediate mixture; synthesizing propylene; and separating propylene. According to the method for synthesizing propylene by using methanol, the raw material is a methanol aqueous solution. By the method disclosed by the invention, the problem that in the existing technique for preparing propylene by using methanol, the selectivity of propylene is low can be solved effectively, and therefore, the subsequent separation difficulty is reduced, the production cost is lowered and the economic efficiency of enterprises is improved.

Description

Technical field [0001] The invention relates to the field of chemical engineering, in particular to a method for preparing propylene, specifically a method for synthesizing propylene from methanol. Background technique [0002] Propylene is an important organic chemical raw material and the basic raw material for the three major synthetic materials of plastics, synthetic rubber and synthetic fibers. With the rapid growth of demand for propylene derivatives such as polypropylene, the demand for propylene has also increased year by year. Propylene is mainly derived from petroleum, and the existing propylene production route has provided propylene resources to the greatest extent, which can no longer meet the increasing demand for propylene. Therefore, the need for new sources of propylene has attracted increasing attention. From a strategic point of view, the use of natural gas methanol to propylene technology (also known as MTP technology) can effectively broaden the channels of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C1/20B01J29/40
CPCY02P20/52
Inventor 何霖韩伟谭亚南
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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