Production method of low-carbon olefin

A technology of low-carbon olefins and production methods, which is applied in ethylene production, biological raw materials, molecular cracking to hydrocarbons, etc., and can solve the problem of low selectivity of low-carbon olefins

Active Publication Date: 2011-09-21
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 of low selectivity of low-carbon olefins existing in the prior art, and a new production method of low-carbon olefins is provided

Method used

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  • Production method of low-carbon olefin
  • Production method of low-carbon olefin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～2

[0021] In a fast fluidized bed reactor, such as figure 1 As shown, the first reaction zone is a fast fluidized bed, the second reaction zone is a riser, and both the first regeneration zone and the second regeneration zone of the regenerator are turbulent fluidized beds. The raw material including methanol enters the first reaction zone of the reactor, and reacts to generate light olefins, and the gas phase product enters the subsequent separation section. After being stripped, part of the separated catalyst to be used is returned to the first reaction zone, and the other part enters the first regeneration zone to be regenerated by burning charcoal, and the regenerated catalyst in the first regeneration zone is returned to the first reaction zone. The rest of the catalyst in the first regeneration zone enters the second regeneration zone, the regenerated catalyst enters the second reaction zone to contact with raw materials, and the catalyst and product enter the separation zo...

Embodiment 3

[0025] According to the conditions described in Example 2, the average temperature in the first reaction zone is 400° C., the reaction pressure is 0.3 MPa in gauge pressure, pure methanol is fed, the methanol feed is 4.2 tons / hour, and the methanol weight hourly space velocity is 6 Hour -1 , the average carbon deposit of the catalyzer is 1% (weight), the catalyzer is SAPO-34, the reaction temperature in the second reaction zone is 500 ° C, the raw material is mixed carbon four, wherein the olefin content is 87%, and the mixed carbon four feed rate is 0.4 tons / hour, the reaction pressure is 0.3 MPa in gauge pressure, and the gas phase velocity is 5 m / s. Palladium / alumina CO combustion aid is added to the first regeneration zone, the content of palladium is 0.05% (weight), and the added amount accounts for 1% (weight) of the catalyst storage in the first regeneration zone. The carbon deposition amount of the regenerated catalyst in the first regeneration zone is 0.8% (weight), ...

Embodiment 4

[0027] According to the conditions described in Example 2, the average temperature in the first reaction zone is 460° C., the reaction pressure is 0.15 MPa in gauge pressure, pure methanol is fed, the methanol feed is 4.2 tons / hour, and the methanol weight hourly space velocity is 10 Hour -1 , the average carbon deposit of the catalyst is 2.7% (weight), the catalyst is SAPO-34, the reaction temperature in the second reaction zone is 620 ° C, the raw material is mixed carbon four, wherein the olefin content is 87%, and the mixed carbon four feed rate is 0.4 tons / hour, the reaction pressure is 0.15MPa in gauge pressure, and the gas phase velocity is 7 m / s. The carbon deposit of the regenerated catalyst in the first regeneration zone is 1.5% by weight, and the carbon deposit of the regenerated catalyst in the first regeneration zone is 0.05% by weight. The experimental results are: the yield of low carbon olefins at the outlet of the first reaction zone is 82.54% (weight), the y...

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Abstract

The invention relates to a production method of low-carbon olefin, and the method is mainly used for solving the problem that the yield of low-carbon olefin is low. The production method comprises the following steps: (a) contacting a raw material comprising methanol with a catalyst comprising an aluminosilicophosphate molecular sieve in a first reaction zone of a reactor so as to generate a product material flow I comprising the low-carbon olefin and simultaneously form an inactivated catalyst; (b) feeding the inactivated catalyst into a first regeneration zone of a regenerator for regeneration, wherein the carbon storage of the catalyst after regeneration in the first regeneration zone is between 0.8-2.5%, and at least partial catalyst is returned back to the first reaction zone; (c) feeding the residual catalyst in the first regeneration zone into a second regeneration zone for regeneration so as to obtain a regenerated catalyst with the carbon storage less than 0.2%, and feeding the regenerated catalyst into a second reaction zone for contacting with the raw material comprising C4 olefin so as to obtain a product material flow II comprising the low-carbon olefin; and (d) feeding the product material flow II into a gas-solid separation zone, and then feeding into a separation station together with the product material flow I. By using the method, the problem is well solved, and the method can be used in industrial production of low-carbon olefin.

Description

technical field [0001] The invention relates to a method for producing low-carbon olefins. technical background [0002] Low-carbon 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. Som...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C11/04C07C4/08C07C1/20
CPCC07C4/08C07C1/20C07C11/04C07C11/06Y02P20/584Y02P30/20Y02P30/40
Inventor 齐国祯钟思青王洪涛金永明
Owner CHINA PETROLEUM & CHEM CORP
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