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Method for increasing yield of ethylene and propylene

A technology of propylene and ethylene, applied in the field of propylene yield, catalytic conversion of methanol or dimethyl ether to improve ethylene, and can solve problems such as low selectivity and low yield

Active Publication Date: 2010-08-11
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 that there are problems of low yield and low selectivity of the target product ethylene and propylene in the prior literature and technology, and a new method for improving the yield of ethylene and propylene is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Using methanol as raw material, the first reaction zone and the second reaction zone both use riser reactors, with SAPO-34 molecular sieve as the catalyst, the reaction temperature in the first reaction zone is 450°C, the contact time is 2 seconds, and the reaction pressure is 0.05MPa; The reaction temperature in the second reaction zone is 480° C., the contact time is 3 seconds, and the reaction pressure is 0.02 MPa. In the experiment, after the reaction gas mixture in the first reaction zone is separated from the solid catalyst, the gas phase directly enters the second reaction zone for reaction. The total reaction results are as follows: methanol conversion rate is 100%, ethylene yield is 45%, and propylene yield is 33%.

Embodiment 2

[0017] Using dimethyl ether as raw material, the first reaction zone and the second reaction zone both use riser reactors, with SAPO-34 molecular sieve as the catalyst, the reaction temperature in the first reaction zone is 400 ° C, the contact time is 1 second, and the reaction pressure is 0.4 MPa; the reaction temperature in the second reaction zone is 500° C., the contact time is 5 seconds, and the reaction pressure is 0.3 MPa. In the experiment, after the reaction gas mixture in the first reaction zone is separated from the solid catalyst, the gas phase directly enters the second reaction zone for reaction. The total reaction results are as follows: the conversion rate of dimethyl ether is 99%, the yield of ethylene is 47%, and the yield of propylene is 34%.

Embodiment 3

[0019] Methanol and dimethyl ether are used as raw materials, the weight ratio of methanol and dimethyl ether is 1:1, the first reaction zone and the second reaction zone both adopt fast fluidized bed reactors, and SAPO-34 molecular sieve is used as the catalyst. The reaction temperature in the reaction zone is 500°C, the contact time is 3 seconds, and the reaction pressure is 1.2MPa; the reaction temperature in the second reaction zone is 550°C, the contact time is 6 seconds, and the reaction pressure is 1.0MPa. In the experiment, after the reaction gas mixture in the first reaction zone is separated from the solid catalyst, the gas phase directly enters the second reaction zone for reaction. The total reaction results are: the conversion rate of methanol and dimethyl ether is 100%, the yield of ethylene is 51%, and the yield of propylene is 30%. %.

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PUM

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Abstract

The present invention relates to one kind of ethylene and propylene producing process with high selectivity and high yield. The production process includes the following steps: 1. reaction of oxygen compound material in the first reaction region through contacting with catalyst to produce gas-solid mixture I, and separating in the fast separator I to obtain the catalyst I to be regenerated and the effluent I containing ethylene and propylene; 2. reaction of the effluent I in the second reaction region through contacting with catalyst II to produce gas-solid mixture II, and separating in the fast separator II to obtain the catalyst II to be regenerated and the effluent II containing ethylene and propylene; 3. regenerating the catalyst I and the catalyst II in the regenerating reactor, and returning the regenerated catalysts to the first and the second reaction regions separately; and 4. separating the effluent II in a post step to obtain ethylene product and propylene product. The production process may be applied in industrial production.

Description

technical field [0001] The invention relates to a method for increasing the yield of ethylene and propylene, in particular to a method for improving the yield of ethylene and propylene through the catalytic conversion of methanol or dimethyl ether. Background technique [0002] Petrochemical industry is an important pillar industry in the national economy. It provides a large amount of chemical raw materials for industry, agriculture, transportation and national defense. It is one of the most relevant and leading industrial sectors in the national economy. Propylene and ethylene are the two most important basic raw materials for modern petrochemical industry. [0003] Propylene is mainly used to produce polypropylene, cumene, carbonyl alcohol, acrylonitrile, propylene oxide, acrylic acid, isopropanol, etc. Among them, polypropylene accounts for more than half of the world's propylene demand. At present, 67% of the world's propylene comes from steam cracking to produce ethyl...

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 谢在库刘俊涛杨为民钟思青
Owner CHINA PETROLEUM & CHEM CORP