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Method for preparing low-carbon olefins through methanol catalysis

A low-carbon olefin, catalytic preparation technology, applied in the direction of hydrocarbon production from oxygen-containing organic compounds, organic chemistry, chemical recovery, etc., can solve the problems of low yields of ethylene and propylene

Active Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 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 by methanol catalysis is provided

Method used

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  • Method for preparing low-carbon olefins through methanol catalysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] in such as figure 1 In the reaction device shown, the pre-reactor is a dense-phase fluidized bed, the main reactor is a fast fluidized bed, the catalyst is SAPO-34, and the methanol raw material with a purity of 99.5% is vaporized and heat-exchanged to 150 ° C. After being divided into Two parts, the first part enters the pre-reactor to generate a stream with a mass percentage of dimethyl ether of 52%, and then enters the bottom of the main reactor reaction zone, and the second part of the raw material is separated from the two parts along the axial direction of the main reactor reaction zone. One feed inlet is injected into the reaction zone of the main reactor, and the two feed inlets are respectively located at 1 / 4 and 1 / 2 bed heights of the reaction zone of the main reactor from the bottom of the reaction zone of the main reactor. The reaction conditions of the pre-reactor are: the reaction pressure is 0.01MPa in gauge pressure, the average temperature is 200°C, the...

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 80.54% (by weight).

Embodiment 3

[0026] According to the conditions and steps described in Example 1, the methanol raw material with a purity of 99.5% is vaporized and heat-exchanged to 250°C and divided into two parts. The first part enters the pre-reactor to generate a stream with a mass percentage of dimethyl ether of 68%. , and then enter the bottom of the main reactor reaction zone, the second part of the raw material is injected into the main reactor reaction zone from two feed ports separated along the axial direction of the main reactor reaction zone, and the two feed ports are respectively located at a distance from the main reactor At the bottom 1 / 4 and 3 / 4 of the bed height of the main reactor reaction zone. The reaction conditions of the pre-reactor are: the reaction pressure is 0.01MPa in gauge pressure, the average temperature is 350°C, and the reaction conditions in the reaction zone of the main reactor are: the reaction pressure is 0.01MPa in gauge pressure, the average temperature is 500°C, th...

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Abstract

The invention relates to a method for preparing low-carbon olefins through methanol catalysis, mainly solving the problem of low yield of the low-carbon olefins in the prior art. The technical scheme of the invention, which well solves the problem is as follows: the method comprises the following steps: (1) a methanol raw material is divided into at least two parts after being subjected to vaporization and heat exchange, the first part enters a pre-reactor to generate a material flow comprising dimethyl ether which enters the bottom part of a main reaction zone, and the second part of the raw material is injected into a reaction zone of a main reactor from at least one feed port which is spaced out along the axial direction of the reaction zone of the main reactor; (2) the material flow comprising the dimethyl ether and the raw material is in contact with a catalyst in the main reaction zone to generate a low-carbon olefins product and form a carbon deposition catalyst at the same time; (3) the carbon deposition catalyst enters the pre-reactor after exchanging heat with the raw material so as to form a spent catalyst; and (4) the spent catalyst enters a regenerator for regeneration, and the regenerated catalyst returns the reaction zone of the main reactor. The method disclosed by the invention can be used in industrial production of ethylene and propylene.

Description

technical field [0001] The invention relates to a method for catalytically preparing light olefins from methanol. 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, b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/20C07C11/04C07C11/06
CPCY02P20/52Y02P20/584Y02P30/20Y02P30/40
Inventor 齐国祯钟思青王莉陈伟
Owner CHINA PETROLEUM & CHEM CORP