Naphtha upgrading by combined olefin forming and aromatization
AssigneeUop LLC
InventorPaula L. Bogdan
Life of this patent
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Abstract
A process combination is disclosed to selectively upgrade naphtha to obtain a component for blending into gasoline. A naphtha feedstock is subjected to formation of olefins from paraffins using a nonacidic catalyst followed by aromatization of the resulting olefin-containing product to obtain improved yields of an aromatics-rich, high-octane gasoline product.
Claims16
A process combination for selectively upgrading a naphtha feedstock to obtain an aromatics-rich product having an increased octane number comprising the steps of:
- (a) contacting the naphtha feedstock in an olefin-forming zone with a nonacidic, non-zeolitic olefin-forming catalyst, comprising at least one platinum-group metal component and a nonacidic support, at olefin-forming conditions comprising a temperature of from about 350 to 650° C., pressure of from about 100 kPa to 4 MPa and liquid hourly space velocity of from about 0.1 to 100 hr−1 to dehydrogenate paraffins without substantial dehydrocyclization and produce an olefin-containing intermediate stream;
- and,
- (b) converting the olefin-containing intermediate stream to yield aromatics in an aromatization zone maintained at aromatization conditions comprising a temperature of from about 260 to 560° C., pressure of from about 100 kPa to 4 MPa and liquid hourly space velocity of from about 0.5 to 40 hr−1 in the presence of free hydrogen with a solid acid aromatization catalyst comprising a supported platinum-group metal component and recovering the aromatics-rich product.
A process combination for selectively upgrading a naphtha feedstock to obtain an aromatics-rich product having an increased octane number comprising the steps of:
- (a) contacting the naphtha feedstock in an olefin-forming zone with a nonacidic, non-zeolitic olefin-forming catalyst, comprising at least one platinum-group metal component and a support consisting essentially of a non-acidic inorganic-oxide, at olefin-forming conditions comprising a temperature of from about 350 to 650° C., pressure of from about 100 kPa to 4 MPa and liquid hourly space velocity of from about 0.1 to 100 hr−1 to dehydrogenate paraffins without substantial dehydrocyclization and produce an olefin-containing intermediate stream;
- and,
- (b) converting the olefin-containing intermediate stream from the olefin-forming zone without separation of hydrogen to yield aromatics in an aromatization zone maintained at aromatization conditions comprising a temperature of from about 260 to 560° C., pressure of from about 100 kPa to 4 MPa and liquid hourly space velocity of from about 0.5 to 40 hr−1 with a solid acid aromatization catalyst comprising at least one platinum-group metal component and recovering the aromatics-rich product.
A process combination for selectively upgrading a naphtha feedstock to obtain an aromatics-rich product having an increased octane number comprising the stews of:
- (a) contacting the naphtha feedstock in an olefin-forming zone with a nonacidic, non-zeolitic olefin-forming catalyst, comprising at least one platinum-group metal component and a support consisting essentially of a metal-oxide solid solution, at olefin-forming conditions comprising a temperature of from about 350 to 650° C., pressure of from about 100 kPa to 4 MPa and liquid hourly space velocity of from about 0.1 to 100 hr−1 to dehydrogenate paraffins without substantial dehydrocyclization and produce an olefin-containing intermediate stream;
- and,
- (b) converting the olefin-containing intermediate stream from the olefin-forming zone without separation of hydrogen to yield aromatics in an aromatization zone maintained at aromatization conditions comprising a temperature of from about 260 to 560° C., pressure of from about 100 kPa to 4 MPa and liquid hourly space velocity of from about 0.5 to 40 hr−1 with a solid acid aromatization catalyst comprising at least one platinum-group metal component and recovering the aromatics-rich product.
Dependencies are inferred from the claim text.