Method for increasing yield of ethylene and propylene

A technology of propylene and ethylene, which is applied in the field of improving the yield of ethylene and propylene in the catalytic reaction of methanol or dimethyl ether, can solve the problems of low selectivity and low yield of ethylene and propylene, and achieve good technical effects

Active Publication Date: 2008-04-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is that there are problems of low yield and low selectivity of the target produc

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Using methanol as the raw material, the first reactor adopts a fast fluidized bed reactor with SAPO-34 molecular sieve as the catalyst, and the second reactor adopts a fixed-bed reactor with ZSM-5 molecular sieve as the catalyst. The reaction temperature of the first reactor is 460℃, reaction space velocity is 7 hours -1 , The reaction pressure is 0.1MPa; the reaction temperature of the second reactor is 480℃, and the reaction space velocity is 8 hours -1 , The reaction pressure is 0.11MPa. In the experiment, after the reaction product of the first reactor is separated, the remaining C4 and above hydrocarbons enter the second reactor for reaction. The total reaction result is: methanol conversion rate 98%, ethylene yield 46.5%, and propylene yield 36.7%.

Embodiment 2

[0018] Using dimethyl ether as the raw material, the first reactor adopts a fast fluidized bed reactor with SAPO-34 molecular sieve as the catalyst, the second reactor adopts a riser reactor with SAPO-34 molecular sieve as the catalyst, and the first reactor reacts The temperature is 560℃, the reaction space velocity is 35 hours -1 , The reaction pressure is 0.5MPa; the reaction temperature of the second reactor is 570℃, and the reaction space velocity is 20 hours -1 , The reaction pressure is 0.01MPa. In the experiment, after the reaction products of the first reactor are separated, all butene-1 and butene-2 ​​enter the second reactor for reaction, and the remaining C4 and above hydrocarbons enter the third reactor for reaction. In the experiment, the first reaction After the reactor reaction product is separated, the remaining C4 and above hydrocarbons enter the second reactor for reaction. The total reaction result is: dimethyl ether conversion rate 89%, ethylene yield 35.2%, a...

Embodiment 3

[0020] Using dimethyl ether as the raw material, water as the diluent, the mass ratio of dimethyl ether to water is 1:2, the first reactor uses a riser reactor, SAPO-34 molecular sieve is used as the catalyst, and the second reactor uses a riser The reactor uses SAPO-34 molecular sieve as the catalyst, the reaction temperature of the first reactor is 510℃, and the space velocity is 25 hours. -1 , The reaction pressure is 1.2MPa; the reaction temperature of the second reactor is 600℃, and the reaction space velocity is 10 hours -1 , The reaction pressure is 1.5MPa. In the experiment, after the reaction product of the first reactor is separated, the remaining C4 and above hydrocarbons enter the second reactor for reaction. The total reaction result is: dimethyl ether conversion rate 95%, ethylene yield 44.2%, propylene yield 33.1 %.

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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 I to produce the effluent I containing ethylene, propylene and C4 and C4+ hydrocarbons, and separating to obtain the effluent II containing C4 and C4+ hydrocarbons, ethylene product and propylene product; and 2. reaction of the effluent II in the second reaction region through contacting with catalyst II to produce the effluent III containing ethylene, propylene and C4 and C4+ hydrocarbons, and separating the effluent III in a post step. 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 in a catalytic reaction of methanol or dimethyl ether by adopting at least two reaction zones. Background technique [0002] Petrochemical industry is an important pillar industry in the national economy. It provides a large number of chemical raw materials for industry, agriculture, transportation, and national defense. It is one of the industries with a strong connection and driving force in the national economy. Propylene and ethylene are the two most important basic raw materials for modern petrochemical industry. [0003] The bulk downstream products of ethylene mainly include polyethylene, ethylene oxide, ethylene glycol, polyvinyl chloride, styrene, and vinyl acetate. The size of ethylene production is a measure of the degree of development of a country's petrochemical industry and even the ...

Claims

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Application Information

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IPC IPC(8): C07C1/20C07C11/04C07C11/06
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 谢在库刘俊涛杨为民钟思青
Owner CHINA PETROLEUM & CHEM CORP
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