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Device for removing trace aromatic hydrocarbons in disproportionated and transalkylation tail hydrogen through recontact and removal method for same

A technology of transalkylation and recontact, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve problems such as the loss of aromatic hydrocarbons that cannot be reduced

Pending Publication Date: 2021-05-11
中海石油宁波大榭石化有限公司
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Problems solved by technology

Therefore, the existing patented technology requires that the reforming recontact unit has sufficient load to receive the disproportionated tail hydrogen, and cannot reduce the loss of aromatics in the disproportionation and transalkylation unit

Method used

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  • Device for removing trace aromatic hydrocarbons in disproportionated and transalkylation tail hydrogen through recontact and removal method for same

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Embodiment Construction

[0031] The present invention will be described in further detail below in conjunction with the embodiments of the accompanying drawings.

[0032] Such as figure 1 As shown, the device for re-contacting dedisproportionation and alkylation of trace aromatics in tail hydrogen in this embodiment includes a hot separation tank 1, a cold separation tank 2, a heat exchanger 3, a tail gas cooler 6, an oil-gas separation tank 4, Chilled water pipe 36 and mixed oil and gas pipe 35.

[0033] The top end of the heat separation tank 1 has a first gas phase delivery pipe 14 , and the bottom end has a first bottom liquid output pipe 12 and a second bottom liquid output pipe 13 .

[0034] The top of the cold separation tank 2 has a second gas phase delivery pipe 22 and a hydrogen circulation pipe 23, the middle part has a first feed inlet 21, and the bottom has a third bottom liquid outlet pipe 24 and a fourth bottom liquid outlet pipe 25; the first feed inlet 21 is connected with the first...

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Abstract

A device for removing trace aromatic hydrocarbons in disproportionated and transalkylation tail hydrogen through recontact is characterized by comprising a hot separation tank, a cold separation tank, a heat exchanger, a tail hydrogen cooler, an oil-gas separation tank, a chilled water pipe and a mixed oil-gas pipe, the top end of the hot separation tank is provided with a first gas phase conveying pipe, and the bottom end of the hot separation tank is provided with a first base solution output pipe and a second base solution output pipe; and the top of the cold separation tank is provided with a second gas-phase conveying pipe and a circulating hydrogen pipe, the middle is provided with a first feeding hole, and the bottom is provided with a third base solution output pipe and a fourth base solution output pipe. The invention also discloses a method for removing trace aromatic hydrocarbons. According to the invention, a reforming device is not needed any more, a part of heat separation tank bottom oil or cold separation tank bottom oil or mixed two kinds of oil of the disproportionation and alkyl transfer device is used as absorption oil to absorb heavy components in disproportionation tail hydrogen, the removal rate of aromatic hydrocarbon can reach 80%, the removal rate of C5 + petroleum hydrocarbon can reach 74%, and aromatic hydrocarbon resources can be effectively recovered.

Description

technical field [0001] The invention relates to a tail hydrogen treatment device, in particular to a disproportionation and alkyl transfer tail hydrogen treatment device, and also relates to a method for removing trace aromatics in the tail hydrogen. Background technique [0002] Hydrogen is an important resource for refining and chemical enterprises, so how to efficiently recycle the by-products (hydrogen-rich tail gas) in the production process of refining and chemical equipment has been a problem that relevant professionals have been paying attention to and paying attention to. At present, pressure swing adsorption (PSA) method, membrane separation method, cryogenic separation method and other methods are usually used for hydrogen-rich tail gas in refining and chemical units, and pressure swing adsorption (PSA) method is the most commonly used method. [0003] The existing disproportionation and alkyl transfer tail hydrogen contains a small amount of C5+ petroleum hydroca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/18B01D53/14B01D53/00
CPCB01D53/002B01D53/1487B01D53/18B01D2257/7027
Inventor 练弢朱旭东王以科夏雨雨张志良王仕文廖原毅段鹏刘丽洁郭亮
Owner 中海石油宁波大榭石化有限公司
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