Back to results
US 6,143,166 AGranted
Process for production of aromatics in parallel reformers with an improved catalyst life and reduced complexity
AssigneeChevron Chemical Company
InventorGerald J. Nacamuli
Life of this patent
Estimating the term…
Abstract
This process relates to reforming a full-boiling range hydrocarbon feed in two parallel stages while maximizing the catalyst life of the heavy cut reformer and/or reducing the complexity of the plant by preferentially sending the higher purity Aromax.RTM. hydrogen to the heavy cut reformer.
Claims17
A process for reforming a full boiling hydrocarbon feed comprising:
- a) separating the hydrocarbon feed into a C.sub.5.spsb.- cut, a C.sub.6 -C.sub.7 cut, and a C.sub.8.spsb.+ cut;
- b) subjecting the C.sub.6 -C.sub.7 cut to catalytic aromatization at elevated temperatures in a first reformer in the presence of hydrogen and using a non-acidic catalyst comprising at least one Group VIII metal and a non-acidic zeolite to produce a first reformate stream comprising benzene and a first gaseous stream comprising hydrogen;
- and
- c) subjecting the C.sub.8.spsb.+ cut in the presence of a hydrogen feed to catalytic aromatization at elevated temperatures in a second reformer and using an acidic catalyst comprising at least one Group VIII metal and a support to produce a second reformate stream comprising C.sub.8 aromatics including xylenes and a second gaseous stream comprising hydrogen;
- wherein at least a part of said first gaseous stream is fed to the second reformer to provide at least a part of said hydrogen feed.
2 more elements
A process for reforming hydrocarbons in two reforming zones operated in parallel, comprising:
- (a) reforming hydrocarbons comprising a C.sub.6 -C.sub.7 cut over a monofunctional, non-acidic aromatization catalyst at reforming conditions to form a reformate comprising benzene and a gas comprising hydrogen having a hydrogen purity of at least 88 mole %, and
- (b) feeding at least a portion of the gas comprising hydrogen and a hydrocarbon feed comprising a C.sub.8.spsb.+ cut to a bifunctional reformer under reforming conditions to form a C.sub.8 aromatic product comprising xylenes.
A process for reforming hydrocarbons in two reforming zones comprising:
- a) reforming hydrocarbons comprising a C.sub.6.spsb.+ cut over a monofunctional, non-acidic aromatization catalyst at reforming conditions to form a reformate comprising benzene and a gas comprising hydrogen having a hydrogen purity of at least 88 mole %, and
- b) feeding at least a portion of the gas comprising hydrogen and a hydrocarbon feed comprising naphtha to a bifunctional reformer comprising a bifunctional reforming catalyst, under reforming conditions to form a second reformate.
Dependencies are inferred from the claim text.