Aromatics isomerization using a dual-catalyst system
AssigneeUop LLC
InventorsPaula L. Bogdan, James A. Johnson, Gregory J. Gajda, Patrick C. Whitchurch, Stanley J. Frey, Wolfgang A. Spieker
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Abstract
This invention is drawn to a process for isomerizing a non-equilibrium mixture of xylenes and ethylbenzene which contain a substantial concentration of nonaromatics using a catalyst system which features the ability to both convert nonaromatics and to obtain an improved yield of para-xylene from the mixture relative to processes of the known art.
Claims14
A process for the conversion of a hydrocarbon feed mixture comprising a major concentration of nonequilibrium C8 aromatics and a minor concentration of nonaromatics by contacting the mixture with a dual-catalyst system comprising a first catalyst consisting of a tungsten component and a second catalyst comprising from about 0.01 to about 0.2 mass-% on an elemental basis of at least one platinum-group metal component at hydrocarbon-conversion conditions comprising a temperature of about 300° to about 550° C., a pressure of about 100 kPa to 5 MPa and a liquid hourly space velocity of about 0.5 to 50 hr−1 with respect to the dual-catalyst system to obtain a converted product comprising a reduced concentration of ethylbenzene and a reduced concentration of nonaromatics than in the feed mixture.
A process for the conversion of a hydrocarbon feed mixture comprising a major concentration of nonequilibrium C8 aromatics and a minor concentration of nonaromatics by contacting the mixture with a dual-catalyst system comprising a first catalyst consisting of a tungsten component and a second catalyst comprising from about 0.01 to about 0.2 mass-% on an elemental basis of at least one platinum-group metal component at hydrocarbon-conversion conditions comprising a temperature of about 300° to about 550° C., a pressure of about 100 kPa to 5 MPa and a liquid hourly space velocity of about 0.5 to 50 hr−1 with respect to the dual-catalyst system to obtain a converted product comprising a higher proportion of at least one xylene isomer, a reduced concentration of ethylbenzene and a reduced concentration of nonaromatics than in the feed mixture.
Dependencies are inferred from the claim text.