Method for improving selectivity of light olefin hydrocarbon

A technology of light olefins and reactors, applied in chemical instruments and methods, chemical recovery, ethylene production, etc., can solve the problems of low yield of light olefins and low added value of products

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 that the yield of light olefins in the prior art is not high, the added value of the product is not high, etc., and a new improvement is provided Method for Light Olefin Yield

Method used

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  • Method for improving selectivity of light olefin hydrocarbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0022] The first reactor is a small fast fluidized bed, fed with pure methanol, the catalyst type is shown in Table 1, the average temperature of the reaction zone is 500°C, and the methanol weight hourly space velocity is 25 hours -1 , the reaction pressure is 0.1MPa in gauge pressure. 40% by weight of the carbon-deposited catalyst enters the regenerator for regeneration, and the carbon content of the regenerated catalyst is 0.2% by weight, and enters the second reactor to contact and react with raw materials including methanol and ethylene, wherein the properties of methanol are the same as those of the first reactor. It enters the second reactor in liquid form, the weight ratio of methanol to ethylene is 0.01:1, and the second reactor is a riser. Catalyst carbon deposition amount after reaction in the second reactor is 0.5% weight, then enters first reactor through pipeline 8, mixes with remaining part carbon deposition catalyst that returns through pipeline 6, the catalyst...

Embodiment 5～6

[0026] According to the conditions described in Example 4, the reaction temperature, reactor type and corresponding space velocity of the first reactor were changed, and the experimental results are shown in Table 2.

[0027] Table 2

[0028]

Embodiment 7～9

[0030] According to the conditions described in Example 4, only the raw material type, raw material weight hourly space velocity, and reaction pressure of the first reactor were changed. The experimental results are shown in Table 3.

[0031] table 3

[0032]

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Abstract

The present invention relates to a method used for improving the yield of light olefins and mainly solves the problem of the low yield of the products when oxygen-containing compounds are used for preparing the light olefins. In the technical proposal, two reactors are used; zeolite catalysts with carbon deposit are prepared in the first reactor; the regenerated catalysts are optimized again in the second reactor; thus the problem can be well solved. The method can be used for the industrial production of the light olefins.

Description

technical field [0001] The invention relates to a method for increasing the yield of light olefins. technical background [0002] Light olefins, namely 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 light olefins are oxygenates, 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 and other energy sources. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/20C07C11/02B01J29/90B01J29/85
CPCY02P20/584Y02P30/20Y02P30/40
Inventor 齐国祯钟思青金永明张惠明
Owner CHINA PETROLEUM & CHEM CORP
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