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Method for increasing yield of ethylene and propylene

A technology of propylene and ethylene, which is applied in the direction of ethylene production, chemical instruments and methods, and conversion of saturated carbon-carbon bonds to produce hydrocarbons. It can solve the problems of low yields of ethylene and propylene, and improve the yield of low-carbon olefins The effect of improving economy and good technical effect

Active Publication Date: 2008-08-13
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
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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 improving the yield of ethylene and propylene is provided

Method used

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  • Method for increasing yield of ethylene and propylene

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Effect test

Embodiment 1

[0022] In a small fast fluidized bed reactor, the spray-dried SAPO-34 molecular sieve was used as a catalyst, the reaction temperature was 450 ° C, and the mixture C 4 The volume ratio of hydrocarbons to methanol is 0.1:1, and the weight space velocity based on methanol is 1.5 hours -1 , the superficial linear velocity of the gas in the reaction zone is 2 m / s. The feeding position is at the bottom of the reactor, and enters the reactor to contact with the catalyst after passing through the porous distribution plate. The reaction product was analyzed by on-line gas chromatography. The reaction time was 10 minutes. The experimental results (weight percentage) were as follows: the conversion rate of methanol was 100%, the yield of ethylene was 20.2%, and the yield of propylene was 14.3%.

Embodiment 2

[0024] According to the conditions described in Example 1, the reactor type adopts a moving bed, the catalyst adopts 20-40 mesh ZSM-34 molecular sieves, the methanol is changed to dimethyl ether, and the reaction temperature is changed to 550 ° C, based on the weight of dimethyl ether Airspeed is 20 hours -1 , The superficial linear velocity of the gas in the reaction zone is 5 m / s, and the experimental results (weight percentage) are: the conversion rate of dimethyl ether is 97.5%, the yield of ethylene is 17.3%, and the yield of propylene is 7.1%.

Embodiment 3

[0026] According to the conditions described in Example 1, the reactor type adopts a dense-phase fluidized bed, and the reaction temperature is changed to 350 ° C, and the weight space velocity based on methanol is changed to 0.5 hours -1 , the superficial linear velocity of the gas in the reaction zone is 0.1 m / s. The experimental results (percentage by weight) are as follows: the conversion rate of methanol is 98.4%, the yield of ethylene is 13.1%, and the yield of propylene is 13.3%.

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Abstract

The invention relates to a method for improving yield of ethylene and propylene, which solves the problem of low yield of ethylene and propylene during lower olefins preparing process from conversion of methanol and dimethyl ether. The invention uses at least one of methanol and dimethyl ether and C4 hydrocarbon as materials, the materials enter into a reaction region from a distributor at the bottom of a fluidization bed reactor or from at least a position axially separated along the reaction region, and contact and react with a catalyst to generate an effluent containing ethylene, propylene and C4 hydrocarbon, the effluent is separated to obtain ethylene, propylene and C4 hydrocarbon; wherein, the C4 hydrocarbon material is from fresh mixed C4 hydrocarbon or mixed C4 hydrocarbon obtained by separation or mixtures thereof. In this way, the invention sloves the problem well, and is useful in industrial production of ethylene and propylene.

Description

technical field [0001] The invention relates to a method for increasing the yield of ethylene and propylene. technical background [0002] Light olefins, defined as ethylene and propylene in the present invention, are important basic chemical raw materials. From a global perspective, ethylene production capacity tends to be saturated, and the basic supply and demand balance. At the end of 2004, the global ethylene production capacity reached 112 million tons, and the demand for that year was 105 million tons. The demand for propylene has grown rapidly in recent years. From 1999 to 2004, the global demand for propylene increased by 4.9% annually, exceeding the average annual growth rate of ethylene by 3.7%. It is estimated that by 2009, the world's propylene production capacity will increase by 19.641 million tons, reaching 94.66 million tons, with an average annual growth rate of 4.8%, and the operating rate will further increase to 88%. At that time, the demand for propyl...

Claims

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Application Information

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IPC IPC(8): C07C1/20C07C6/08C07C11/02B01J29/85B01J29/40B01J8/24
CPCC07C1/20C07C4/06C07C2521/04C07C2529/40C07C2529/70Y02P20/52Y02P30/20Y02P30/40C07C11/04C07C11/06
Inventor 齐国祯钟思青杨远飞王华文
Owner CHINA PETROLEUM & CHEM CORP
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