Catalytic reforming process with multiple zones
AssigneeUop LLC
InventorBryan K. Glover
Life of this patent
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Abstract
A hydrocarbon feedstock is catalytically reformed in a sequence comprising a first bifunctional-catalyst reforming zone, a zeolitic-reforming zone containing a catalyst comprising a platinum-group metal and a nonacidic zeolite, and a terminal bifunctional catalyst reforming zone. The first and terminal bifunctional catalysts preferably comprise a lanthanide-series metal component. The process combination permits higher severity, higher aromatics yields and/or increased throughput relative to the known art, and is particularly useful in connection with moving-bed reforming facilities with continuous catalyst regeneration.
Claims20
A process for the catalytic reforming of hydrocarbons comprising contacting a hydrocarbon feedstock in a catalyst system which comprises at least three sequential catalyst zones to obtain a reformate, comprising the steps of:
- (a) contacting the feedstock with a first bifunctional catalyst comprising a platinum-group metal component, a lanthanide-series metal component, a refractory inorganic oxide, and a halogen component in an first reforming zone at first reforming conditions to obtain a first effluent;
- (b) contacting the first effluent with a zeolitic reforming catalyst comprising a non-acidic zeolite, an alkali metal component and a platinum-group metal component in a zeolitic-reforming zone at second reforming conditions to obtain an aromatized effluent;
- and,
- (c) contacting the aromatized effluent with a terminal bifunctional reforming catalyst comprising a platinum-group metal component, a lanthanide-series metal component, a refractory inorganic oxide, and a halogen component in a terminal reforming zone at terminal reforming conditions to obtain an aromatics-rich product.
A process for the catalytic reforming of hydrocarbons comprising contacting a hydrocarbon feedstock in a catalyst system which comprises at least three sequential catalyst zones to obtain a reformate, comprising the steps of:
- (a) contacting the feedstock with a first bifunctional catalyst comprising a platinum-group metal component, a lanthanide-metal component, a refractory inorganic oxide, and a halogen component in an first reforming zone at first reforming conditions comprising a pressure of from about 100 kPa to 1 MPa, liquid hourly space velocity of from about 0.2 to 20 hr.sup.-1, mole ratio of hydrogen to C.sub.5 + hydrocarbons of about 0.1 to 10, and temperature of from about 400.degree. to 560.degree. C. to obtain a first effluent;
- (b) contacting the first effluent with a zeolitic reforming catalyst comprising a non-acidic zeolite, an alkali metal component and a platinum-group metal component in a zeolitic-reforming zone at second reforming conditions comprising a pressure of from about 100 kPa to 6 MPa, a liquid hourly space velocity of from about 1 to 40 hr.sup.-1 and a temperature of from about 260.degree. to 560.degree. C. to obtain an aromatized effluent;
- and,
- (c) contacting the aromatized effluent with a terminal bifunctional reforming catalyst comprising a platinum-group metal component, a metal promoter, a refractory inorganic oxide, and a halogen component in a terminal reforming zone at terminal reforming conditions comprising a pressure of from about 100 kPa to 1 MPa, liquid hourly space velocity of from about 0.2 to 10 hr.sup.-1, mole ratio of hydrogen to C.sub.5 + hydrocarbons of about 0.1 to 10, and temperature of from about 400.degree. to 560.degree. C. to obtain an aromatics-rich product.
Dependencies are inferred from the claim text.