Process for the coproduction of benzene from refinery sources and ethylene by steam cracking
DC CAFC
First Claim
1. A process for the coproduction of ethylene and purified benzene comprising:
- providing a first mixture comprising benzene, toluene, and one or more C6 to C7 non-aromatics;
separating the majority of the benzene and the one or more C6 to C7 non-aromatics from the majority of the toluene to form a second mixture containing at least a portion of the benzene and at least a portion of the one or more C6 to C7 non-aromatics, wherein the second mixture is substantially free of hydrocarbons having more than nine carbons;
introducing at least a portion of the second mixture to a cracker and thereafter cracking at least about 80% of the C6 to C7 non-aromatics in the portion of the second mixture that has been introduced to the cracker while maintaining essentially no cracking of benzene to produce a cracked product containing ethylene, propylene and pyrolysis gasoline comprising olefins, di-olefins and benzene; and
fractionating the pyrolysis gasoline to form a purified benzene product comprising at least about 80 wt % benzene.
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Abstract
A process for the coproduction of purified benzene and ethylene is provided. The method comprises providing a first mixture comprising benzene, toluene, and one or more C6 to C7 non-aromatics and separating the majority of the benzene and the one or more C6 to C7 non-aromatics from the majority of the toluene to form a second mixture containing benzene and at least a portion of the one or more C6 to C7 non-aromatics. Thereafter at least about 80% of the C6 to C7 non-aromatics in the second mixture are cracked while maintaining essentially no cracking of benzene to produce a cracked product containing ethylene, propylene and pyrolysis gasoline comprising olefins, di-olefins and benzene. The pyrolysis gasoline is preferably hydrotreated and then fractionated to form a purified benzene product comprising at least about 80 wt % benzene. The purified benzene can be used as a feed to a liquid phase or mixed phase alkylation and/or to produce ethylbenzene or cumene.
29 Citations
23 Claims
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1. A process for the coproduction of ethylene and purified benzene comprising:
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providing a first mixture comprising benzene, toluene, and one or more C6 to C7 non-aromatics;
separating the majority of the benzene and the one or more C6 to C7 non-aromatics from the majority of the toluene to form a second mixture containing at least a portion of the benzene and at least a portion of the one or more C6 to C7 non-aromatics, wherein the second mixture is substantially free of hydrocarbons having more than nine carbons;
introducing at least a portion of the second mixture to a cracker and thereafter cracking at least about 80% of the C6 to C7 non-aromatics in the portion of the second mixture that has been introduced to the cracker while maintaining essentially no cracking of benzene to produce a cracked product containing ethylene, propylene and pyrolysis gasoline comprising olefins, di-olefins and benzene; and
fractionating the pyrolysis gasoline to form a purified benzene product comprising at least about 80 wt % benzene. - View Dependent Claims (2, 3, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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- 4. A process as claimed in 1, further comprising alkylating at least a portion of the benzene in the purified benzene product with ethylene to form ethylbenzene.
Specification
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- Resources
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Current AssigneeDavid Netzer
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Original AssigneeDavid Netzer
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InventorsNetzer, David
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Primary Examiner(s)GRIFFIN, WALTER DEAN
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Application NumberUS10/000,559Publication NumberTime in Patent Office812 DaysField of Search585/323, 585/485, 585/648, 585/650, 208/67, 208/69, 208/130US Class Current585/648CPC Class CodesC10G 2400/30 AromaticsC10G 69/12 including at least one poly...
