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US 5,507,939 AGranted
Catalytic reforming process with sulfur preclusion
AssigneeUop LLC
InventorsMichael B. Russ, Frank R. Whitsura, Roger L. Peer, Joseph Zmich, Chi-Chu D. Low
Life of this patent
Estimating the term…
Abstract
A hydrocarbon feedstock is catalytically reformed to effect dehydrocyclization of paraffins in a process combination comprising a first reforming zone, a sulfur-removal zone containing a mixed reforming catalyst and sulfur sorbent comprising a manganese component to preclude sulfur from the feed to a second reforming zone. The process combination shows substantial benefits over prior art processes in achieving reforming-catalyst stability.
Claims20
A process for the catalytic reforming of a hydrocarbon feedstock comprising a combination of:
- (a) contacting a combined feed comprising the hydrocarbon feedstock and free hydrogen in the absence of added halogen in a first reforming zone at first reforming conditions comprising a pressure of from atmospheric to 20 atmospheres, a temperature of from 260.degree. to 560.degree. C., a liquid hourly space velocity of from about 1 to 40 hr.sup.-1, and a hydrogen to hydrocarbon ratio of from about 0.1 to 10 moles of hydrogen per mole of hydrocarbon with a first reforming catalyst comprising platinum and alumina to convert sulfur compounds in the hydrocarbon feedstock to hydrogen sulfide and produce a first effluent;
- (b) contacting the first effluent in the absence of added halogen in a sulfur-removal zone at sulfur-removal conditions comprising a pressure of from atmospheric to 20 atmospheres, a temperature of from 260.degree. to 560.degree. C., a liquid hourly space velocity of from about 5 to 200 hr.sup.-1, and a hydrogen to hydrocarbon ratio of from about 0.1 to 10 moles of hydrogen per mole of hydrocarbon with a physical mixture of a second reforming catalyst containing a platinum-group metal component and a solid sulfur sorbent comprising a manganese component to remove hydrogen sulfide and produce a halogen-free second effluent containing less than 20 parts per billion sulfur;
- and,
- (c) contacting the second effluent in a second reforming zone in the presence of free hydrogen and in the absence of added halogen at second reforming conditions comprising a pressure of from atmospheric to 20 atmospheres, a temperature of from 425.degree. to 560.degree. C., a liquid hourly space velocity of from about 1 to 10 hr.sup.-1, and a hydrogen to hydrocarbon ratio of from about 0.1 to 10 moles of hydrogen per mole of hydrocarbon with a dehydrocyclization catalyst comprising a non-acidic L-zeolite and a platinum-group metal component to produce a halogen-free aromatics-rich effluent.
1 more element
A process for the catalytic reforming of a hydrocarbon feedstock comprising a combination of:
- (a) contacting a combined feed comprising the hydrocarbon feedstock and free hydrogen in the absence of added halogen in a first reforming zone at first reforming conditions comprising a pressure of from atmospheric to 20 atmospheres, a temperature of from 260.degree. to 560.degree. C., a liquid hourly space velocity of from about 1 to 40 hr.sup.-1, and a hydrogen to hydrocarbon ratio of from about 0.1 to 10 moles of hydrogen per mole of hydrocarbon with a first reforming catalyst comprising platinum and alumina to convert sulfur compounds in the hydrocarbon feedstock to hydrogen sulfide and produce a first effluent;
- (b) contacting the first effluent in the absence of added halogen in a sulfur-removal zone at sulfur-removal conditions comprising a pressure of from atmospheric to 20 atmospheres, a temperature of from 260.degree. to 560.degree. C., a liquid hourly space velocity of from about 5 to 200 hr.sup.-1, and a hydrogen to hydrocarbon ratio of from about 0.1 to 10 moles of hydrogen per mole of hydrocarbon with a physical mixture of a dehydrocyclization catalyst comprising a non-acidic L-zeolite and a platinum-group metal component and a solid sulfur sorbent comprising a manganese component to remove hydrogen sulfide and produce a halogen-free second effluent containing less than 20 parts per billion sulfur;
- and,
- (c) contacting the second effluent in a second reforming zone in the presence of free hydrogen and in the absence of added halogen at second reforming conditions comprising a pressure of from atmospheric to 20 atmospheres, a temperature of from 425.degree. to 560.degree. C., a liquid hourly space velocity of from about 1 to 10 hr.sup.-1, and a hydrogen to hydrocarbon ratio of from about 0.1 to 10 moles of hydrogen per mole of hydrocarbon with the dehydrooyclization catalyst comprising a non-acidic L-zeolite and a platinum group metal component to produce a halogen-free aromatics-rich effluent.
1 more element
A process for the catalytic reforming of a hydrocarbon feedstock comprising a combination of:
- (a) contacting a combined feed comprising the hydrocarbon feedstock and free hydrogen in the absence of added halogen in a first reforming zone at first reforming conditions comprising a pressure of from atmospheric to 20 atmospheres, a temperature of from 260.degree. to 560.degree. C., a liquid hourly space velocity of from about 1 to 40 hr.sup.-1, and a hydrogen to hydrocarbon ratio of from about 0.1 to 10 moles of hydrogen per mole of hydrocarbon with a first reforming catalyst comprising platinum and alumina to convert sulfur compounds in the hydrocarbon feedstock to hydrogen sulfide and produce a first effluent;
- (b) contacting the first effluent in the absence of added halogen in a sulfur-removal zone at sulfur-removal conditions comprising a pressure of from atmospheric to 20 atmospheres, a temperature of from 260.degree. to 560.degree. C., a liquid hourly space velocity of from about 5 to 200 hr.sup.-1, and a hydrogen to hydrocarbon ratio of from about 0.1 to 10 moles of hydrogen per mole of hydrocarbon with a physical mixture of a dehydrocyclization catalyst comprising a non-acidic L-zeolite and a platinum-group metal component and a solid sulfur sorbent comprising a manganese component to remove hydrogen sulfide and produce a halogen-free second effluent containing less than 20 parts per billion sulfur;
- (c) contacting the second effluent in a second reforming zone in the presence of free hydrogen and in the absence of added halogen at second reforming conditions comprising a pressure of from atmospheric to 20 atmospheres, a temperature of from 425.degree. to 560.degree. C., a liquid hourly space velocity of from about 1 to 10 hr.sup.-1, and a hydrogen to hydrocarbon ratio of from about 0.1 to 10 moles of hydrogen per mole of hydrocarbon with the dehydrocyclization catalyst comprising potassium-form L-zeolite and a platinum group metal component to produce a halogen-free aromatics-enriched effluent;
- and,
- (d) repeating the sequential contact of the effluent from step (c) in one or more stages of a (b) sulfur-removal zone and a (c) second reforming zone to produce a halogen-free aromatics-rich effluent.
2 more elements
A process for the catalytic reforming of a contaminated feedstock comprising a combination of:
- (a) contacting the contaminated feedstock in a sorbent pretreating step with a nickel sorbent at a pressure of from atmospheric to 50 atmospheres, a temperature of from about 70.degree. to 200.degree. C., and a liquid hourly space velocity of from about 2 to 50 hr.sup.-1 to produce a low-sulfur hydrocarbon feedstock;
- (b) contacting a combined feed comprising the hydrocarbon feedstock and free hydrogen in a first reforming zone at first reforming conditions comprising a pressure of from atmospheric to 20 atmospheres, a temperature of from 260.degree. to 560.degree. C., a liquid hourly space velocity of from about 1 to 40 hr.sup.-1, and a hydrogen to hydrocarbon ratio of from about 0.1 to 10 moles of hydrogen per mole of hydrocarbon with a first reforming catalyst comprising platinum and alumina to convert sulfur compounds in the hydrocarbon feedstock to hydrogen sulfide and produce a first effluent;
- (c) contacting the first effluent in the absence of added halogen in a sulfur-removal zone at sulfur-removal conditions comprising a pressure of from atmospheric to 20 atmospheres, a temperature of from 260.degree. to 560.degree. C., a liquid hourly space velocity of from about 5 to 200 hr.sup.-1, and a hydrogen to hydrocarbon ratio of from about 0.1 to 10 moles of hydrogen per mole of hydrocarbon with a physical mixture of a dehydrocyclization catalyst comprising a non-acidic L-zeolite and a platinum-group metal component and a solid sulfur sorbent comprising a manganese component to remove hydrogen sulfide and produce a halogen-free second effluent containing less than 20 parts per billion sulfur;
- and,
- (d) contacting the second effluent in a second reforming zone in the presence of free hydrogen and in the absence of added halogen at second reforming conditions comprising a pressure of from atmospheric to 20 atmospheres, a temperature of from 425.degree. to 560.degree. C., a liquid hourly space velocity of from about 1 to 10 hr.sup.-1, and a hydrogen to hydrocarbon ratio of from about 0.1 to 10 moles of hydrogen per mole of hydrocarbon with a dehydrocyclization catalyst comprising potassium-form L-zeolite and a platinum group metal component to produce a halogen-free aromatics-rich effluent.
2 more elements
Dependencies are inferred from the claim text.