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Combined method for preparing ethylbenzene from refinery dry gas as raw material

A combined method and refinery dry gas technology, applied in the field of ethylbenzene production, can solve the problems of single raw material and low utilization rate, and achieve the effects of high utilization rate, high recovery rate and simple operation

Active Publication Date: 2016-03-30
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0010] In order to solve the problems of single raw material and low utilization rate in the existing process of producing ethylbenzene from benzene with dilute ethylene from refinery dry gas as raw material, the present invention proposes a highly efficient method of producing ethylbenzene from refinery dry gas combined process

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  • Combined method for preparing ethylbenzene from refinery dry gas as raw material

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Embodiment 1

[0043] Reference attachment figure 1 Explain the process.

[0044] The raw materials are coking dry gas and catalytic dry gas from refineries. The main composition of catalytic dry gas is hydrogen 3.79% (wt, the same below), nitrogen 32.58%, methane 18.97%, ethane 15.61%, ethylene 12.58%, and coking dry gas mainly The composition is hydrogen 2.11%, nitrogen 6.96%, methane 45.07%, ethane 36.82%, and ethylene 2.91%, which are respectively sent to the decarbonization unit to remove acid gases such as carbon dioxide and then sent to the alkylation unit; The device adopts a fixed bed reactor, adopts ZSM-5 molecular sieve catalyst I and ZSM-5 molecular sieve catalyst II, and preferably adopts the method recommended in CN200910057824.1 to produce ethylbenzene products. The hydrocarbonification tail gas produced by the alkylation unit is mainly composed of hydrogen 4.55 %, methane 37.76%, ethane 24.77%, and ethylene 0.18% are sent to the PSA unit; the carbon two components in the alkyla...

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Abstract

A combined method for preparing ethylbenzene by using a refinery dry gas as a raw material comprises the following steps: alkylation: allowing ethylene and benzene in the raw materials to react to generate ethylbenzene, and unreacted ethane and others to enter an alkylation exhaust; 2, pressure swing adsorption PSA: allowing the C2 component in the alkylation exhaust to enter into a PSA concentrated gas after being subjected to separating and desorbing of methane, hydrogen and the like; 3, ethane cracking: allowing the PSA concentrated gas to perform pyrolysis to generate ethylene, hydrogen and other components, allowing the pyrolysis gas to enter into an oil absorption device after passing through a waste heat boiler and a quenched water tower for temperature reduction; 4, absorbing down C3 and the component containing more C in the pyrolysis gas subjected to oil absorption, obtaining the concentrated gases of C2 at the top of an absorption tower, including methane, hydrogen, ethane, ethylene light components; 5, selective hydrogenization: feeding hydrogenised concentrated gases of C2 into a decarbonizing unit and a refinery dry gas in the step 1 for mixing, desorbing the acidic gas, and then feeding the obtained gas to an alkylation device for cyclic utilization. The method solves the problems that the raw material is single and low in utilization ratio in the prior art and is a new combined method for preparing the ethylbenzene.

Description

Technical field [0001] The present invention relates to the technical field of preparing ethylbenzene using refinery dry gas as a raw material, in particular to a combined method for recovering ethylene and ethane in refinery dry gas by adopting a benzene absorption method and preparing ethylbenzene . Background technique [0002] Refinery dry gas contains ethylene and ethane. At present, refinery dry gas is mainly burned as fuel, and its utilization value is low. The ethylene in the dry gas can be recovered to produce dilute ethylene, and sent to the alkylation unit as a raw material, such as ethylbenzene unit to prepare ethylbenzene, or to prepare p-methylethylbenzene. [0003] At present, the methods for recovering ethylene from dry gas in refineries mainly include cryogenic separation method, oil absorption method, complexation separation method, pressure swing adsorption method, etc. Each method has its own characteristics. Cryogenic separation method has mature technology,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/073C07C2/66C07C11/04C07C5/327C07C7/11C07C7/12
CPCY02P20/10Y02P20/50Y02P30/40
Inventor 程建民盖金祥过良万辉李琰刘智信李东风
Owner CHINA PETROLEUM & CHEM CORP
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