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Method and system for preparing ethylbenzene and hydrogen by using refinery dry gas

A refinery dry gas and hydrogen technology, applied in the fields of chemical industry and oil refining, can solve the problems of lack of effective utilization means of ethane resources, and achieve the effects of comprehensive utilization of energy, reduction of investment, and small investment

Pending Publication Date: 2022-05-06
CHINA PETROLEUM & CHEM CORP +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, the ethane resources in the dry gas of fuel-based refineries lack effective utilization means

Method used

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  • Method and system for preparing ethylbenzene and hydrogen by using refinery dry gas
  • Method and system for preparing ethylbenzene and hydrogen by using refinery dry gas
  • Method and system for preparing ethylbenzene and hydrogen by using refinery dry gas

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Embodiment approach

[0037] According to one embodiment of the invention, when the refinery dry gas is rich in ethane, the refinery dry gas is added from step (1) and / or step (5).

[0038] According to one embodiment of the invention, when the refinery dry gas is rich in ethylene, the refinery dry gas is added from step (4).

[0039] According to one embodiment of the present invention, when the refinery dry gas is rich in ethane and ethylene, the refinery dry gas is added from at least one of steps (1), (4) and (5).

[0040] In the present invention, preferably, the method further comprises: (6) hydrogen extraction: separating hydrogen from hydrogen-rich components.

[0041] In the present invention, in step (3), preferably, the method further comprises: using aromatic hydrocarbon to absorb heavy components in the obtained hydrogenated product. The adoption of this preferred embodiment is more conducive to the removal of heavy components, impurities and the like in the obtained hydrogenated product. ...

Embodiment 1

[0093] (1) adopt such as Figure 2 As shown in the process, the ethane-rich gas is sent to an ethane cracking unit for cracking, and the cracked gas obtained is washed in an oil washing tower. The cracked gas absorbs heavy components and part of heat in the wax oil (distillation range is 275℃) in the oil washing tower, then sent to a water cooler for cooling to 40℃, and then compressed to increase the pressure of the cracked gas to 3.5MPa, thus obtaining the compressed and cooled cracked gas.

[0094] (2) sending the cracked gas after compression and cooling into a C2 recovery unit, recovering C2 components in a benzene absorption tower by adopting a shallow cold benzene washing process, and separating C2 components in the benzene absorption tower; See Table 3 for the amount of ethylene entering the C2 recovery unit, the amount of ethylene recovered by the C2 recovery unit and the ethylene recovery rate; The conditions of benzene absorption tower in the shallow cold benzene washing...

Embodiment 2

[0100] (1) adopt such as Figure 3 As shown in the process, the ethane-rich gas is sent to an ethane cracking unit for cracking, and the cracked gas obtained is washed in an oil washing tower. The cracked gas absorbs heavy components and part of heat in the wax oil (distillation range is 275℃) in the oil washing tower, then sent to a water cooler for cooling to 40℃, and then compressed to increase the pressure of the cracked gas to 3.5MPa, thus obtaining the compressed and cooled cracked gas.

[0101] (2) sending the compressed and cooled cracked gas into a catalytic cracking unit (C2 recovery unit) to separate C2 components; See Table 3 for the amount of ethylene entering the C2 recovery unit, the amount of ethylene recovered by the C2 recovery unit and the ethylene recovery rate;

[0102] (3) In the presence of a hydrogenation catalyst, the recovered C2 component is selectively hydrogenated to remove alkynes and dienes to obtain a hydrogenated product, and benzene is used to abso...

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Abstract

The invention relates to the field of oil refining and chemical engineering, and discloses a method and a system for preparing ethylbenzene and hydrogen by using refinery dry gas, and the method comprises the following steps: (1) cracking ethane-rich gas and / or alkane-rich refinery dry gas to obtain cracking gas containing ethylene and hydrogen; (2) recovering a C2 component in the pyrolysis gas; (3) carrying out selective hydrogenation on the recovered C2 component to remove alkyne and / or alkadiene in the C2 component; (4) contacting the hydrogenation product with benzene independently or together with ethylene-rich refinery dry gas for alkylation reaction to obtain ethylbenzene; and (5) performing C2 concentration on the gas-phase material which does not participate in the alkylation reaction in the step (4) independently or together with the alkane-rich refinery dry gas to obtain ethane-rich gas and hydrogen-rich gas, and optionally, returning the obtained ethane-rich gas to the step (1) for cracking. By adopting the method, C2 resources in the refinery dry gas can be fully utilized, the utilization rate of ethane is increased, the yields of ethylbenzene and hydrogen are increased, and an effective way is provided for realizing chemical transformation for fuel type oil refining enterprises.

Description

Technical field [0001] The invention relates to the fields of oil refining and chemical industry, in particular to a method and a system for preparing ethylbenzene and hydrogen from refinery dry gas. technical background [0002] Integration of refining and chemical industry can make the best use of crude oil resources, comprehensively utilize by-products and intermediate products, optimize the allocation of public utilities, reduce production and construction costs, bring into full play scale benefits, enhance enterprises' ability to resist risks and improve their profitability. It is a long-standing development strategy of refining and chemical industry at home and abroad. [0003] At present, the overall refining capacity is surplus, while the demand for ethylene and its downstream derivatives continues to grow, and the market gap of high-end petrochemical products is large. The transformation of refinery from fuel type to fuel-chemical type is the general trend of the sustain...

Claims

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Application Information

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IPC IPC(8): C07C2/64C07C15/073C07C4/02C07C5/327C07C7/11C07C7/163C07C7/167C07C7/00C07C11/04C01B3/24
CPCC07C4/02C07C5/327C07C7/11C07C7/163C07C7/167C07C7/005C07C2/64C01B3/24C07C11/04C07C15/073
Inventor 徐跃华张忠和吴长江张炜李东风谢涛罗淑娟吴军王振维刘智信陈国忠刘罡张利军何细藕彭晖杜周张燕孙长福
Owner CHINA PETROLEUM & CHEM CORP
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