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US 5,211,837 AGranted
Catalytic reforming process with sulfur preclusion
AssigneeUop LLC
InventorsMichael B. Russ, Roger L. Peer, Joseph Zmich, Chi-Chu D. Low
Life of this patent
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Abstract
A hydrocarbon feedstock is catalytically reformed to effect dehydrocyclization of paraffins in a process combination comprising a first reforming zone and a sulfur-removal zone utilizing 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 the stability of the extremely sulfur-sensitive catalyst utilized in the second reforming zone.
Claims18
A process for the catalytic reforming of a hydrocarbon feedstock containing small amounts of sulfur compounds, 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 atmosphere, 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 alumine to convert sulfur compounds in the hydrocarbon feedstock to hydrogen sulfide and produce a halogen-free first effluent;
- (b) contacting the first effluent 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 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 sulfur sorbent comprising a manganese component to remove hydrogen sulfide and produce a halogen-free second effluent containing less than about 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. .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 second reforming catalyst comprising a non-acidic L-zeolite, an alkali-metal component 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 containing small amounts of sulfur compounds, 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 in the presence of free hydrogen 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 to convert essentially all of the sulfur compounds in the hydrocarbon feedstock to hydrogen sulfide and produce a halogen-free first effluent;
- (b) contacting the first effluent 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 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 solid sulfur sorbent consisting essentially of one or more manganese oxides to remove hydrogen sulfide and produce a halogen-free second effluent containing less than 20 ppb 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 second reforming catalyst comprising a non-acidic L-zeolite, an alkali-metal component and a platinum-group metal component to produce a halogen-free aromatics-rich effluent.
1 more element
Dependencies are inferred from the claim text.