Aromatic saturation and ring opening process
First Claim
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1. A process for hydrocracking a feed comprising not less than 20 weight % of one or more aromatic compounds containing at least two fused aromatic rings which compounds are unsubstituted or substituted by up to two C1-4 alkyl radicals to produce a product stream comprising not less than 35 weight % of a mixture of C2-4 alkanes comprising:
- (i) passing said feed stream to a ring saturation unit at a temperature from 300°
C. to 500°
C. and a pressure from 2 to 10 MPa together with from 100 to 300 kg of hydrogen per 1,000 kg of feedstock over an aromatic hydrogenation catalyst to yield a stream in which not less than 60 weight % of said one or more aromatic compounds containing at least two rings which compounds are unsubstituted or substituted by up to two C1-4 alkyl radicals at least one of the aromatic rings has been completely saturated;
(ii) passing the resulting stream to a ring cleavage unit at a temperature from 200°
C. to 600°
C. and a pressure from 1 to 12 MPa together with from 50 to 200 kg of hydrogen per 1,000 kg of said resulting stream over a ring cleavage catalyst; and
(iii) separating the resulting product into a C2-4 alkanes stream, a liquid paraffinic stream and an aromatic stream.
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Abstract
Less conventional sources of hydrocarbon feedstocks such as oil sands, tar sands and shale oils are being exploited. These feedstocks generate a larger amount of heavy oil, gas oil, asphaltene products and the like containing multiple fused aromatic ring compounds. These multiple fused aromatic ring compounds can be converted into feed for a hydrocarbon cracker by first hydrogenating at least one ring in the compounds and subjecting the resulting compound to a ring opening and cleavage reaction. The resulting product comprises lower paraffins suitable for feed to a cracker, higher paraffins suitable for example as a gasoline fraction and mono aromatic ring compounds (e.g. BTX) that may be further treated.
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Citations
31 Claims
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1. A process for hydrocracking a feed comprising not less than 20 weight % of one or more aromatic compounds containing at least two fused aromatic rings which compounds are unsubstituted or substituted by up to two C1-4 alkyl radicals to produce a product stream comprising not less than 35 weight % of a mixture of C2-4 alkanes comprising:
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(i) passing said feed stream to a ring saturation unit at a temperature from 300°
C. to 500°
C. and a pressure from 2 to 10 MPa together with from 100 to 300 kg of hydrogen per 1,000 kg of feedstock over an aromatic hydrogenation catalyst to yield a stream in which not less than 60 weight % of said one or more aromatic compounds containing at least two rings which compounds are unsubstituted or substituted by up to two C1-4 alkyl radicals at least one of the aromatic rings has been completely saturated;
(ii) passing the resulting stream to a ring cleavage unit at a temperature from 200°
C. to 600°
C. and a pressure from 1 to 12 MPa together with from 50 to 200 kg of hydrogen per 1,000 kg of said resulting stream over a ring cleavage catalyst; and
(iii) separating the resulting product into a C2-4 alkanes stream, a liquid paraffinic stream and an aromatic stream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. In an integrated process for the upgrading of an initial hydrocarbon comprising not less than 5 weight % of one or more aromatic compounds containing at least two fused aromatic rings which compounds are unsubstituted or substituted by up to two C1-4 alkyl radicals comprising subjecting the hydrocarbon to several distillation steps to yield an intermediate stream comprising not less than 20 weight % of one or more aromatic compounds containing at least two fused aromatic rings which compounds are unsubstituted or substituted by up to two C1-4 alkyl radicals the improvement comprising:
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(i) passing said intermediate stream to a ring saturation unit at a temperature from 300°
C. to 500°
C. and a pressure from 2 to 10 MPa together with from 100 to 300 kg of hydrogen per 1,000 kg of feedstock over an aromatic hydrogenation catalyst to yield a stream in which in not less than 60 weight % of said one or more aromatic compounds containing at least two rings which compounds are unsubstituted or substituted by up to two C1-4 alkyl radicals at least one of the aromatic rings has been completely saturated;
(ii) passing the resulting stream to a ring cleavage unit at a temperature from 200°
C. to 600°
C. and a pressure from 1 to 12 MPa together with from 50 to 200 kg of hydrogen per 1,000 kg of said resulting stream over a ring cleavage catalyst; and
(iii) separating the resulting product into a C2-4 alkanes stream, a liquid paraffinic stream and an aromatic stream. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification
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Current AssigneeNOVA Chemicals (International) S.A. (NOVA Chemicals Holding GmbH), Universitaet Stuttgart
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Original AssigneeNOVA Chemicals (International) S.A. (NOVA Chemicals Holding GmbH)
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InventorsWeitkamp, Jens, Traa, Yvonne, Demir, Fehime, Simanzhenkov, Vasily, Glaser, Roger, Oballa, Michael
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current208/113
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CPC Class CodesC10G 2300/1096 Aromatics or polyaromaticsC10G 45/44 Hydrogenation of the aromat...C10G 45/48 containing nickel or cobalt...C10G 45/50 in combination with chromiu...C10G 45/58 to change the structural sk...C10G 65/12 including cracking steps an...Y10S 585/94 Opening of hydrocarbon ring
