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Patent

Method for preparing aromatic hydrocarbon through light hydrocarbon aromatization

11 May 2018-
TL;DR: In this paper, a method for preparing an aromatic hydrocarbon through light hydrocarbon aromatization was proposed, which solved the problems of easy coking, rapid deactivation and low yield of aromatic hydrocarbons in the prior art.
Abstract: The invention relates to a method for preparing an aromatic hydrocarbon through light hydrocarbon aromatization. A purpose of the present invention is to mainly solve the problems of easy coking, rapid deactivation and low yield of aromatic hydrocarbons of the light hydrocarbon aromatization catalyst in the prior art. The technical scheme comprises that 1) a light hydrocarbon raw material is separated in an absorption tower to obtain absorption tail gas and an absorption liquid; 2) the absorption tail gas enters an ethylene recovery unit, and is separated into ethylene, hydrogen and fuel gas,wherein ethylene enters a light hydrocarbon aromatization reactor; 3) the absorption liquid is separated in a pentane removing tower, and is separated into an aromatization reaction raw material and aheavy component stream; 4) the heavy component stream is divided into two streams, wherein one stream used as an absorbent returns to the absorption tower, and the other stream is used as a first aromatic hydrocarbon stream product; 5) the aromatization reaction raw material and the ethylene are fed into the light hydrocarbon aromatization reactor; 6) the light hydrocarbon aromatization reactionproduct is cooled, and the cooled product is separated in a gas-liquid separator to obtain circulation light hydrocarbons and a second aromatic hydrocarbon stream product; and 7) the circulation lighthydrocarbons return the absorption tower. With the technical scheme, the problems in the prior art are well solved. The method of the present invention can be used in the industrial production of light hydrocarbon aromatization.
References
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Patent
05 Oct 2009
TL;DR: An integrated process for producing aromatic hydrocarbons and ethylene and/or propylene and optionally other lower olefins from low molecular weight hydcarbons, preferably methane, is described in this article.
Abstract: An integrated process for producing aromatic hydrocarbons and ethylene and/or propylene and optionally other lower olefins from low molecular weight hydrocarbons, preferably methane, which comprises: (a) contacting one or more low molecular weight alkanes, preferably methane, with a halogen, preferably bromine, under process conditions sufficient to produce a monohaloalkane, preferably monobromomethane, (b) reacting a first portion of the monohaloalkane in the presence of a coupling catalyst under process conditions sufficient to produce aromatic hydrocarbons and C2-5 alkanes, (c) separating the aromatic hydrocarbons from the product mixture of step (b) to produce aromatic hydrocarbons, (d) reacting a second portion of the monohaloalkane in the presence of a coupling catalyst under process conditions sufficient to produce ethylene and/or propylene

24 citations

Patent
29 Jul 2009
TL;DR: In this article, an equipment system consisting of a raw material preprocessor, a liquefied gas spherical tank and a C5 spherical tank was characterized in the field of light hydrocarbon aromatization equipment.
Abstract: The utility model belongs to the field of light hydrocarbon aromatization equipment, and particularly relates to an equipment system for producing aromatic hydrocarbon. The equipment system comprises a raw material preprocessor, a liquefied gas spherical tank and a C5 spherical tank, wherein, the liquefied gas spherical tank and the C5 spherical tank are connected with the raw material preprocessor. The equipment system is characterized in that both the liquefied gas spherical tank and the C5 spherical tank are connected with a feeding vaporizer; the feeding vaporizer is connected in series with a heating furnace, a fixed bed reactor and a gas-liquid separating tank in sequence; the gas phase outlet of the gas-liquid separating tank is connected with the inlet of an absorption tower; the liquid phase outlet of the gas-liquid separating tank is connected with the inlet of the desorption tower; both the liquid phase outlet of the absorption tower and the gas phase outlet of the desorption tower are connected with the inlet of the gas-liquid separating tank; and the desorption tower, a 5th carbon removal tower, a deheptanizer, a desilylation scrubber and an 8th carbon removal tower are connected in series and in sequence. The utility model has the advantages of simple operation, short maintenance period, good yield coefficient, high efficiency and easy popularization.

4 citations

Patent
21 Jan 2015
TL;DR: In this article, a method for producing aromatic hydrocarbons by using naphtha is presented, which consists of a preprocessing and refining unit to obtain reforming topped oil and a reforming feedstock; the reforming feed stock enters a catalytic reforming unit and then enters a depentanizing tower to obtain depentaneized oil and pentane oil; the depentaned oil enters an aromatic hydrocarbon extracting tower as a raw material and undergoes aromatic hydro-carbons extraction to obtain mixed aromatic hydroCarbons and raffinate oil, and the obtained oil mixture enters
Abstract: The invention belongs to the technical field of petroleum refining, and discloses a method for producing aromatic hydrocarbons by using naphtha. The method comprises the following steps: naphtha enters a preprocessing and refining unit to obtain reforming topped oil and a reforming feedstock; the reforming feedstock enters a catalytic reforming unit and then enters a depentanizing tower to obtain depentanized oil and pentane oil; the depentanized oil enters an aromatic hydrocarbon extracting tower as a raw material and undergoes aromatic hydrocarbon extraction to obtain mixed aromatic hydrocarbons and raffinate oil; the topped oil, the pentane oil and the raffinate oil are mixed, and the obtained oil mixture enters an aromatization unit and is separated to obtain a liquid product rich in aromatic hydrocarbons, liquefied gas, and dry gas; and the liquid product is mixed with reformatting generation oil, the obtained mixture enters the depentanizing tower and is depentanized, and the depentanized oil enters the aromatic hydrocarbon extracting tower as an extraction raw material. The method utilizing the aromatization unit to aromatize the topped oil, the pentane oil and the raffinate oil which cannot be processed through catalytic reforming improves the yield of the aromatic hydrocarbons, so the petroleum resource is fully used.

3 citations