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Method for preparing propylene from methyl alcohol

A technology for the preparation of methanol and propylene, applied in chemical instruments and methods, hydrocarbon production from oxygen-containing organic compounds, molecular sieve catalysts, etc., can solve the problems of low propylene yield and poor stability, and achieve high propylene selectivity and anti-carbon deposition Strong ability and good catalyst stability

Inactive Publication Date: 2009-04-15
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing methods for preparing propylene from methanol all use micron-sized ZSM-5 molecular sieves with larger crystal grains as catalysts, so there are disadvantages of low propylene yield and poor stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 2 g SiO 2 / Al 2 o 3 HZSM-5 molecular sieve with a molar ratio of 100 and a grain size of 50-80 nanometers and 1 gram of Al 2 o 3 The binder phases were mixed, and then calcined at 600° C. for 8 hours to obtain Catalyst A.

Embodiment 2

[0015] Prepare catalyst B with embodiment 1, just the SiO of HZSM-5 molecular sieve 2 / Al 2 o 3 The molar ratio was 160.

Embodiment 3

[0017] Prepare catalyst C with embodiment 1, just the SiO of HZSM-5 molecular sieve 2 / Al 2 o 3 The molar ratio was 200.

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Abstract

The invention discloses a method for preparing propylene by methanol, which consists of the following procedures: a. methanol is used as raw material to generate reacting effluent I after passing through a first reactor at the temperature of 150-350 DEG C; in the first reactor, at least one solid acid catalyst chosen from activated aluminum oxide, heteropoly acid and molecular sieve is provided; b. the reacting effluent I is mixed with thinner water, with a mass ratio of 0.2-5:1 between methanol and water; at the temperature of 400-550 DEG C, the mixture passes through a second reactor provided with HZSM-5 molecular sieve catalyst; the mass of airspeed of methanol relative to the HZSM-5 molecular sieve catalyst is 0.2-10h<-1>; and effluent II containing propylene is generated. The method for preparing propylene by methanol has the advantages of high selectivity of propylene and good stability of catalyst by means of the advantages of high activity, little carbon deposit, and strong anti-carbon capacity of nanometer ZSM-5 molecular sieve.

Description

technical field [0001] The invention relates to a method for preparing propylene from methanol by using a HZSM-5 molecular sieve catalyst. Background technique [0002] Propylene is an important basic organic chemical raw material, mainly used in the production of chemical products such as polypropylene, acrylonitrile and propylene oxide. In recent years, due to the rapid growth of global propylene demand, the output of traditional ethylene co-production and refinery recovery of propylene has been difficult to meet the demand. Therefore, new propylene production technologies have attracted widespread attention, among which, coal and natural gas via methanol to propylene ( MTP) technology has received more and more attention. The key to MTP technology is the development of high-performance catalysts. At present, the best catalytic performance for MTP reaction is HZSM-5 molecular sieve. Under the action of the catalyst, methanol is first dehydrated to generate dimethyl ether...

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 毛东森卢冠忠郭强胜王璟雅
Owner SHANGHAI INST OF TECH
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