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Method for preparing low-carbon olefins

A low-carbon olefin and catalyst technology, applied in the field of low-carbon olefin preparation, can solve the problems of low yields of ethylene and propylene, etc.

Active Publication Date: 2014-07-02
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 low yield of ethylene and propylene in the prior art, and a new method for preparing low-carbon olefins is provided

Method used

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  • Method for preparing low-carbon olefins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] in such as figure 1On the shown reaction device, the catalyst is SAPO-34, the purity of the methanol raw material is 99.5%, the pre-reaction zone is a dense-phase fluidized bed, and the reaction conditions in the pre-reaction zone are: the reaction pressure is 0.01MPa in gauge pressure, the average The temperature is 350°C, the average carbon deposition mass fraction of the catalyst is 1.5%, and the gas phase residence time is 6 seconds; the riser reaction conditions are: the reaction pressure is 0.01MPa in gauge pressure, the average temperature is 420°C, and the gas phase residence time is 2 Seconds; the residence time of the gas phase in the gas-solid rapid separation zone is 3 seconds; the part of the riser in the heat exchange zone exchanges heat with the heat exchange medium through an indirect heat exchange method. The heat exchange medium is water, and the gas-solid rapid separation zone is located in the settling zone. The upper part of the settling zone is equ...

Embodiment 2

[0024] According to the conditions and steps described in Example 1, except that the catalyst type was changed to SAPO-18, the carbon-based yield of light olefins was 80.41% (by weight).

Embodiment 3

[0026] According to the conditions and steps described in Example 1, the pre-reaction zone is a fast fluidized bed, and the reaction conditions in the pre-reaction zone are: the reaction pressure is 0.01MPa in gauge pressure, the average temperature is 470 ° C, the average carbon deposit quality of the catalyst is The fraction is 4.5%, and the gas phase residence time is 2 seconds; the riser reaction conditions are: the reaction pressure is 0.01MPa in gauge pressure, the average temperature is 530°C, and the gas phase residence time is 0.4 seconds; the gas phase residence time in the gas-solid rapid separation zone is 1 second; the part of the riser in the heat exchange area exchanges heat with the heat exchange medium through indirect heat exchange. The number is three, and the height of the riser is 15 meters. 50% of the separated catalyst is returned to the pre-reaction area, and 50% is sent to the regenerator for regeneration. The product gas was analyzed by gas chromatogr...

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Abstract

A process for producing light olefins is provided. A feedstock enters a pre-reaction zone and contacts a catalyst comprising at least one silicon-aluminophosphate molecular sieve and produces a gas-phase stream; the gas-phase stream and the catalyst enter at least one riser, and the gas-phase stream and the catalyst pass from an outlet of the at least one riser and enter a gas-solid rapid separation zone; the separated gas-phase stream enters a separation section; a first portion of the separated catalyst returns to the pre-reaction zone, and a second portion is regenerated in a regenerator; wherein an inlet of the at least one riser extends into the pre-reaction zone, about 60% to about 90% of the height of the at least one riser passes through a heat exchange zone, and the outlet extends into the gas-solid rapid separation zone.

Description

technical field [0001] The invention relates to a method for preparing low-carbon olefins. Background technique [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 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 and other energy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/20C07C11/04C07C11/06
CPCB01J8/005C07C2529/85C07C1/20Y02P20/584Y02P30/20Y02P30/40C07C11/04C07C11/06B01J8/1836
Inventor 齐国祯钟思青陈伟俞志楠
Owner CHINA PETROLEUM & CHEM CORP