Method for increasing utilization value of mixed C4

A technology of mixing C4 and its value, which is applied in the processing of gas mixtures, treating hydrocarbon oil, organic chemistry, etc., can solve the problems of effective utilization of non-butadiene components, effective utilization of C4 not involved in refineries, etc., to achieve The effect of increasing economy, improving utilization rate and increasing ethylene production

Active Publication Date: 2013-11-06
PETROCHINA CO LTD
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Problems solved by technology

[0009] CN101475429 discloses a method for comprehensively utilizing cracked C4, that is, using cracked C4 as a raw material, adopting combined technologies such as selective hydrogenation, full hydrogenation, etherification, rectification, and extraction to produce methyl t

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  • Method for increasing utilization value of mixed C4

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Embodiment Construction

[0031] according to figure 1 As shown, the cracking mixed carbon four composition (weight %) is: butadiene: 55.0%, isobutene: 20%, 1-butene: 13%, 2-butene: 7%, n-butane: 2.5%, isobutene Butane: 1%, butyne: 1.5%. Using the process of the present invention, the selective hydrogenation and alkyne removal reaction catalyst is aluminum oxide supported metal palladium, the molar ratio of hydrogen to alkyne in the reaction feed is 2:1, the reaction feed temperature is 30°C, the reaction pressure is 1.0MPa, and the reaction feed volume Airspeed is 5.0h -1 ; The hydrogenation reaction product is extracted and rectified system, wherein the main washing tower is composed of packing and floating valve, the rectifying separation tower is a packed tower, the pressure at the top of the main washing tower is controlled at 390±20Kpa, and the sixth layer of packing 1,3 - The mass percentage of butadiene is controlled at 40-55%, the amount of 1,3-butadiene in the overhead raffinate is controll...

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Abstract

The invention relates to a method for increasing the utilization value of mixed C4. The method comprises the following steps: cracking C4, carrying out selective hydrogenation for removal of alkynes and allowing vinylacetylene and 1-butyne to produce 1,3-butadiene and 1-butylene through hydrogenation, wherein the content of alkynes in hydrogenation products is less than 15*10<-9>; subjecting obtained materials to extraction and rectification so as to allow 1,3-butadiene to be separated from other C4 fractions, mixing residual C4 material flow with C4 produced in a refinery plant, subjecting obtained mixed C4 to a hydroisomerization reaction so as to allow 1-butylene in the mixed C4 to be isomerized into 2-butylene and separating isomerization products so as to obtain an isobutene product; and introducing residual C4 material flow into a disproportionation unit, allowing 2-butylene in the residual C4 material flow and ethylene to undergo disproportionation so as to produce propylene, carrying out separation and allowing unreacted ethylene and residual C4 material flow to undergo full hydrogenation so as to enable all the unsaturated hydrocarbons to undergo hydrogenation saturation. According to the method, the content of alkenes in the hydrogenation products is lower than 1%, and the products can be used as high-quality ethylene cracking materials.

Description

Technical field: [0001] The present invention relates to a process combination for comprehensive utilization of refinery C4 and cracked C4 as raw materials to produce 1,3-butadiene, isobutene, propylene, methyl ethyl ketone and ethylene cracking materials, specifically, to a process using Select combined technologies such as hydrogenation to remove alkynes, extraction, rectification, isomerization, disproportionation, and full hydrogenation to make full use of each component in refinery C4 and ethylene cracking C4, which can greatly improve A method of mixing C4 utilization values. Background technique: [0002] Mixed C4 refers to the by-product C4 fraction of the steam cracking unit and the by-product C4 fraction of the catalytic cracking unit of the refinery. The cracked C4 contains 1,3-butadiene, C4 alkanes, isobutene, n-butene, 1-butene, 2-butene, vinyl acetylene, ethyl acetylene and other components are generally extracted butadiene and isobutene is used in MTBE device...

Claims

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Application Information

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IPC IPC(8): C07C11/167C07C11/09C07C11/06C07C5/09C07C5/13C07C6/04C10G70/00C10G70/02
Inventor 晁会霞曾佑富熊纯青冯江元谭振明曹维良
Owner PETROCHINA CO LTD
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