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Method for improving selectivity of low carbon olefin hydrocarbon

A low-carbon olefin and selectivity technology, applied in chemical instruments and methods, hydrocarbon production from oxygen-containing organic compounds, molecular sieve catalysts, etc., can solve the problem of low selectivity of low-carbon olefins

Active Publication Date: 2008-09-24
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 that the selectivity of low-carbon olefins in the prior art is not high, and a new method for improving the selectivity of low-carbon olefins is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0017] In a small fast fluidized bed reactor, the average temperature of the reaction zone is 500°C, pure methanol is fed, and the methanol weight hourly space velocity is 25 hours -1 , Catalyst types are shown in Table 1. The fluidized bed reaction device is equipped with catalyst regeneration and circulation equipment. To maintain the stability of the catalyst flow control, the reactor outlet product was analyzed by online gas chromatography. The experimental results are shown in Table 1.

[0018] Table 1

[0019] parameters

Embodiment 5～7

[0021] According to the conditions described in Example 4, only the reactor temperature was changed, and the experimental results are shown in Table 2.

[0022] Table 2

[0023] parameters

Embodiment 8～14

[0025] According to the conditions described in Example 4, only the type of raw material and the weight hourly space velocity of the raw material were changed, and the experimental results are shown in Table 3.

[0026] table 3

[0027]

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PUM

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Abstract

The present invention relates to a method used for improving the selectivity of low-carbon olefins and mainly solves the problem of the low selectivity of the products when oxygen-containing compounds are used for preparing the low-carbon olefins. In the technical proposal, oxygen-containing compounds with the weight hourly space velocity of 1 to 50 h<-1> are used as raw materials; the average temperature of the reaction zone in a reactor is 300 to 600 DEG C; the oxygen-containing compounds and aluminosilicophosphate zeolite catalysts contact in the reaction zone; when the transfer index of hydrogen in the reaction is between 0.001 and 0.1, the selectivity of the low-carbon olefins is highest; thus the problem can be well solved. The method can be used for the industrial production of the low-carbon olefins.

Description

technical field [0001] The invention relates to a method for improving the selectivity of light olefins. technical background [0002] Low-carbon olefins, including ethylene and propylene, are two important basic chemical raw materials, and their demand is increasing. Generally, ethylene and propylene are produced through petroleum routes, but due to the limited supply and high price of petroleum resources, the cost of producing ethylene and propylene from petroleum resources continues to increase. In recent years, people have begun to vigorously develop the technology of converting alternative raw materials into ethylene and propylene. Among them, an important class of alternative raw materials for the production of low-carbon olefins is oxygenated compounds, such as alcohols (methanol, ethanol), ethers (dimethyl ether, methyl ethyl ether), esters (dimethyl carbonate, methyl formate Esters), etc., these oxygenated compounds can be converted from coal, natural gas, biomass...

Claims

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Application Information

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IPC IPC(8): C07C1/20C07C11/02B01J29/85
Inventor 齐国祯钟思青王洪涛王莉
Owner CHINA PETROLEUM & CHEM CORP