Process for reforming at low severities with high-activity, high-yield, tin modified platinum-iridium catalysts
First Claim
1. A process for improving the octane quality of a naphtha comprising a mixture of paraffins, aromatics and naphthenes, which comprises reforming said naphtha feed over a tin modified platinum-iridium catalyst at reforming conditions sufficient to produce predominantly dehydrogenation and ring isomerization reactions, with minimum paraffin dehydrocyclization, and produce a reformate of RON clear octane ranging from about 80 to about 95, said catalyst comprising from about 0.1 percent to about 0.7 percent platinum, from about 0.1 percent to about 0.7 percent iridium, and from about 0.02 percent to about 0.4 percent tin, wherein each of said metals is composited with and uniformly dispersed throughout an inorganic oxide support.
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Abstract
A process for reforming a naphtha feed at low severities with tin modified platinum-iridium catalysts. In particular, both high selectivity, and high activity are manifested by such catalysts in reforming a naphtha feed at low severities in the lead reactor, or reactors, of a series of reactors; i.e., within the dehydrogenation and ring isomerization zone, or zones, of a reforming unit. The lead reactors of the series are charged with a tin-containing platinum-iridium catalyst, and the naphtha feed reformed to produce a low RON clear C5 + liquid reformate. The low octane product of the lead reactors may be transferred to a mogas pool, into blending components, or all or some part of the product further reformed. Preferably, the product is further reformed in a tail reactor, and preferably the tail reactor is charged with a non-tin containing platinum, or platinum-iridium catalyst.
11 Citations
12 Claims
- 1. A process for improving the octane quality of a naphtha comprising a mixture of paraffins, aromatics and naphthenes, which comprises reforming said naphtha feed over a tin modified platinum-iridium catalyst at reforming conditions sufficient to produce predominantly dehydrogenation and ring isomerization reactions, with minimum paraffin dehydrocyclization, and produce a reformate of RON clear octane ranging from about 80 to about 95, said catalyst comprising from about 0.1 percent to about 0.7 percent platinum, from about 0.1 percent to about 0.7 percent iridium, and from about 0.02 percent to about 0.4 percent tin, wherein each of said metals is composited with and uniformly dispersed throughout an inorganic oxide support.
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5. In a process of improving the octane quality of a naphtha comprised of a mixture of paraffins, aromatics and naphthenes in a reforming unit comprised of a plurality of serially connected reactors inclusive of one or more lead reactors and a tail reactor, each of which contains a platinum catalyst, the naphtha flowing in sequence from one reactor of the series to another and contacting the catalyst in the presence of hydrogen, the improvement comprising, providing the lead reactor, or reactors, of the series with a catalyst comprised of from about 0.1 percent to about 0.7 percent platinum, from about 0.1 percent to about 0.7 percent iridium, and from about 0.02 percent to about 0.4 percent tin, based on the total weight of the catalyst, wherein each of said metals is composited with and uniformly dispersed throughout an inorganic oxide support and reforming said naphtha feed over said catalyst at reforming conditions in said one or more lead reactors sufficient to produce predominantly dehydrogenation and ring isomerization reactions, with minimum paraffin dehydrocyclization, and produce a reformate of RON clear ranging from about 80 to about 95.
- 6. The process of claim 6 wherein the catalyst in the lead reactor, or reactors, contains from about 0.1 percent to about 0.5 percent platinum, from about 0.1 percent to about 0.5 percent iridium, and from about 0.05 to about 0.3 percent tin.
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8. The process of claim 8 wherein the catalyst in the tail reactor contains from about 0.1 percent to about 0.5 percent platinum, and from about 0.1 percent to about 0.5 percent iridium.
Specification