US4613423A
Expired / Lapsed
US
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Catalytic reforming process
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1985-05-02
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Granted: 1986-09-23
•
Expires: 2005-05-02
Abstract
Abstract A process wherein, in a series of reforming zones, or reactors, each of which contains a bed, or beds of catalyst, the catalyst in the leading reforming zone, or zones, is constituted of supported platinum or supported platinum and rhenium, and the catalyst in the rearward reforming zone, or zones of the series, is constituted of platinum, rhenium, and iridium. The amount of (rhenium+iridium) relative to the platinum in the last reforming zone, or zones is present in weight ratio of at least about 1.5:1 and more preferably ranges from about 1.5:1 to about 10:1. The beds of catalyst are contacted with a hydrocarbon or naphtha feed, and hydrogen, at reforming conditions to produce a hydrocarbon, or naphtha product of improved octane, and the product is withdrawn.
Inventors
- 👤 George A. Swan
- 👤 William C. Baird, Jr.
- 👤 Robert G. Corry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:16
CPC Classifications
C; C10; C10G; C10G59/00; C10G59/02
Claims Analysis
Total Claims: 60
Claim 1
Independent Claim
115 words
In a process for improving the octane quality of a naphtha 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 or platinum-rhenium catalyst, the naphtha flowing in sequence from one reactor of the series to another and contacting the catalyst at reforming conditions in the presence of hydrogen, the improvement comprising, providing the tail reactor with a platinum-rhenium catalyst to which iridium has been added in amount sufficient to increase the C 5 + liquid yield vis-a-vis a similar process utilizing in the tail reactor a platinum-rhenium catalyst to which no iridium has been added.
Claim 2
Dependent Claim
115 words
In a process for improving the octane quality of a naphtha 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 or platinum-rhenium catalyst, the naphtha flowing in sequence from one reactor of the series to another and contacting the catalyst at reforming conditions in the presence of hydrogen, the improvement comprising, providing the tail reactor with a platinum-rhenium catalyst to which iridium has been added in amount sufficient to increase the C 5 + liquid yield vis-a-vis a similar process utilizing in the tail reactor a platinum-rhenium catalyst to which no iridium has been added.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the weight ratio of (Re+Ir):Pt in the tail reactor is 1.5:1, or greater.
Claim 4
Dependent Claim
22 words
The process of claim 1 wherein the weight ratio of (Re+Ir):Pt in the tail reactor ranges from about 1.5:1 to about 10:1.
Claim 5
Dependent Claim
16 words
The process of claim 3 wherein the (Re+Ir):Pt ratio ranges from about 2:1 to about 5:1.
Claim 6
Dependent Claim
30 words
The process of claim 3 wherein the iridium is added to the catalyst of the tail reactor in concentration providing a weight ratio of iridium:rhenium no greater than about 1:1.
Claim 7
Dependent Claim
18 words
The process of claim 5 wherein the weight ratio of iridium:rhenium ranges from about 1:5 to about 1:1.
Claim 8
Dependent Claim
22 words
The process of claim 3 wherein the catalyst of the tail reactor contains from about 0.01 to about 3 weight percent platinum.
Claim 9
Dependent Claim
22 words
The process of claim 7 wherein the catalyst of the tail reactor contains from about 0.05 to about 1 weight percent platinum.
Claim 10
Dependent Claim
22 words
The process of claim 3 wherein the catalyst of the tail reactor contains from about 0.1 to about 3 weight percent rhenium.
Claim 11
Dependent Claim
22 words
The process of claim 9 wherein the catalyst of the tail reactor contains from about 0.05 to about 1 weight percent rhenium.
Claim 12
Dependent Claim
22 words
The process of claim 3 wherein the catalyst of the tail reactor contains from about 0.1 to about 3 weight percent iridium.
Claim 13
Dependent Claim
24 words
The process of claim 11 wherein the catalyst of the tail reactor contains from about 0.05 weight percent to about 1 weight percent iridium.
Claim 14
Dependent Claim
41 words
The process of claim 1 wherein the catalyst of the tail reactor contains from about 0.05 to about 1 weight percent iridium, and sufficient platinum and rhenium to provide a weight ratio of (Re+Ir):Pt ranging from about 1.5:1 to about 10:1.
Claim 15
Dependent Claim
22 words
The process of claim 1 wherein the catalyst of the tail reactor contains from about 0.1 to about 3 weight percent halogen.
Claim 16
Dependent Claim
22 words
The process of claim 14 wherein the catalyst of the tail reactor contains from about 1 to about 1.5 weight percent halogen.
Claim 17
Dependent Claim
22 words
The process of claim 1 wherein the catalyst of the tail reactor is sulfided, and contains to about 0.2 weight percent sulfur.
Claim 18
Dependent Claim
25 words
The process of claim 15 wherein the catalyst of the tail reactor is sulfided, and contains from about 0.05 to about 0.15 weight percent sulfur.
Claim 19
Dependent Claim
124 words
In a process for reforming, with hydrogen, a naphtha feed in a reforming unit having at least one catalyst-containing on stream reactor through which the hydrogen and naphtha are heated and flowed to contact the catalyst at reforming conditions, the improvement comprising concentrating within the most rearward reaction zone of the said reforming unit up to about 30 percent, based on the total weight of on-oil catalyst in said reforming unit, of a rhenium and iridium promoted platinum catalyst, the weight ratio of (rhenium+iridium):platinum being at least about 1.5:1, and concentrating within the most forward reaction zone of said reforming unit a platinum catalyst, or rhenium promoted platinum catalyst which contains rhenium in concentration providing a weight ratio of rhenium:platinum up to about 1.2:1.
Claim 20
Dependent Claim
124 words
In a process for reforming, with hydrogen, a naphtha feed in a reforming unit having at least one catalyst-containing on stream reactor through which the hydrogen and naphtha are heated and flowed to contact the catalyst at reforming conditions, the improvement comprising concentrating within the most rearward reaction zone of the said reforming unit up to about 30 percent, based on the total weight of on-oil catalyst in said reforming unit, of a rhenium and iridium promoted platinum catalyst, the weight ratio of (rhenium+iridium):platinum being at least about 1.5:1, and concentrating within the most forward reaction zone of said reforming unit a platinum catalyst, or rhenium promoted platinum catalyst which contains rhenium in concentration providing a weight ratio of rhenium:platinum up to about 1.2:1.
Claim 21
Dependent Claim
24 words
The process of claim 18 wherein the weight ratio of (Re+Ir):Pt in the most rearward reaction zone ranges from about 1.5:1 to about 10:1.
Claim 22
Dependent Claim
24 words
The process of claim 19 wherein the weight ratio of (Re+Ir):Pt in the most rearward reaction zone ranges from about 2:1 to about 5:1.
Claim 23
Dependent Claim
29 words
The process of claim 18 wherein the most rearward reaction zone of said reforming unit contains up to about 50 percent of said rhenium and iridium promoted platinum catalyst.
Claim 24
Dependent Claim
29 words
The process of claim 18 wherein the most rearward reaction zone of said reforming unit contains up to about 85 percent of said rhenium and iridium promoted platinum catalyst.
Claim 25
Dependent Claim
18 words
The process of claim 18 wherein the forward reaction zone of said reforming unit contains a platinum-rhenium catalyst.
Claim 26
Dependent Claim
36 words
The process of claim 18 wherein the iridium is added to the catalyst of the most rearward reaction zone of the reforming unit in concentration providing a weight ratio of iridium:rhenium no greater than about 1:1.
Claim 27
Dependent Claim
18 words
The process of claim 24 wherein the weight ratio of iridium:rhenium ranges from about 1:5 to about 1:1.
Claim 28
Dependent Claim
28 words
The process of claim 18 wherein the catalyst of the most rearward reaction zone of the reforming unit contains from about 0.01 to about 3 weight percent platinum.
Claim 29
Dependent Claim
28 words
The process of claim 26 wherein the catalyst of the most rearward reaction zone of the reforming unit contains from about 0.05 to about 1 weight percent platinum.
Claim 30
Dependent Claim
28 words
The process of claim 18 wherein the catalyst of the most rearward reaction zone of the reforming unit contains from about 0.1 to about 3 weight percent rhenium.
Claim 31
Dependent Claim
28 words
The process of claim 28 wherein the catalyst of the most rearward reaction zone of the reforming unit contains from about 0.05 to about 1 weight percent rhenium.
Claim 32
Dependent Claim
28 words
The process of claim 18 wherein the catalyst of the most rearward reaction zone of the reforming unit contains from about 0.1 to about 3 weight percent iridium.
Claim 33
Dependent Claim
30 words
The process of claim 30 wherein the catalyst of the most rearward reaction zone of the reforming unit contains from about 0.05 weight percent to about 1 weight percent iridium.
Claim 34
Dependent Claim
47 words
The process of claim 31 wherein the catalyst of the most rearward reaction zone of the reforming unit contains from about 0.05 to about 1 weight percent iridium, and sufficient platinum and rhenium to provide a weight ratio of (Re+Ir):Pt ranging from about 1:5 to about 10:1.
Claim 35
Dependent Claim
28 words
The process of claim 18 wherein the catalyst of the most rearward reaction zone of the reforming unit contains from about 0.1 to about 3 weight percent halogen.
Claim 36
Dependent Claim
28 words
The process of claim 23 wherein the catalyst of the most rearward reaction zone of the reforming unit contains from about 1 to about 1.5 weight percent halogen.
Claim 37
Dependent Claim
28 words
The process of claim 18 wherein the catalyst of the most rearward reaction zone of the reforming unit is sulfided, and contains to about 0.2 weight percent sulfur.
Claim 38
Dependent Claim
31 words
The process of claim 35 wherein the catalyst of the most rearward reaction zone of the reforming unit is sulfided, and contains from about 0.05 to about 0.15 weight percent sulfur.
Claim 39
Dependent Claim
130 words
In a process for reforming, with hydrogen, a naphtha feed in a reforming unit which contains a plurality of catalyst-containing on-stream reactors connected in series, the hydrogen and naphtha being heated and flowed from one reactor to another to contact the catalyst contained therein at reforming conditions, the improvement comprising concentrating within the most rearward reactors of the series from about 30 percent to about 85 percent, based on the total weight of catalyst in all of the reactors of the unit, of a rhenium and iridium promoted platinum catalyst, the weight ratio of (rhenium+iridium):platinum being at least about 1.5:1, and concentrating within the remaining reactor space a platinum catalyst, or rhenium promoted platinum catalyst which contains rhenium in concentration providing a weight ratio of rhenium:platinum up to about 1.2:1.
Claim 40
Dependent Claim
130 words
In a process for reforming, with hydrogen, a naphtha feed in a reforming unit which contains a plurality of catalyst-containing on-stream reactors connected in series, the hydrogen and naphtha being heated and flowed from one reactor to another to contact the catalyst contained therein at reforming conditions, the improvement comprising concentrating within the most rearward reactors of the series from about 30 percent to about 85 percent, based on the total weight of catalyst in all of the reactors of the unit, of a rhenium and iridium promoted platinum catalyst, the weight ratio of (rhenium+iridium):platinum being at least about 1.5:1, and concentrating within the remaining reactor space a platinum catalyst, or rhenium promoted platinum catalyst which contains rhenium in concentration providing a weight ratio of rhenium:platinum up to about 1.2:1.
Claim 41
Dependent Claim
26 words
The process of claim 37 wherein the weight ratio of (Re+Ir):Pt in the most rearward reactors of the series ranges from about 1.5:1 to about 10:1.
Claim 42
Dependent Claim
26 words
The process of claim 38 wherein the weight ratio of (Re+Ir):Pt in the most rearward reactor of the series ranges from about 2:1 to about 5:1.
Claim 43
Dependent Claim
18 words
The process of claim 37 wherein the forward reaction space of said reforming unit contains a platinum-rhenium catalyst.
Claim 44
Dependent Claim
35 words
The process of claim 37 wherein the iridium is added to the catalyst of the most rearward reactors of the reforming unit in concentration providing a weight ratio of iridium:rhenium no greater than about 1:1.
Claim 45
Dependent Claim
18 words
The process of claim 41 wherein the weight ratio of iridium:rhenium ranges from about 1:5 to about 1:1.
Claim 46
Dependent Claim
27 words
The process of claim 37 wherein the catalyst of the most rearward reactors of the reforming unit contains from about 0.01 to about 3 weight percent platinum.
Claim 47
Dependent Claim
27 words
The process of claim 43 wherein the catalyst of the most rearward reactors of the reforming unit contains from about 0.05 to about 1 weight percent platinum.
Claim 48
Dependent Claim
27 words
The process of claim 37 wherein the catalyst of the most rearward reactors of the reforming unit contains from about 0.1 to about 3 weight percent rhenium.
Claim 49
Dependent Claim
27 words
The process of claim 45 wherein the catalyst of the most rearward reactors of the reforming unit contains from about 0.05 to about 1 weight percent rhenium.
Claim 50
Dependent Claim
27 words
The process of claim 37 wherein the catalyst of the most rearward reactors of the reforming unit contains from about 0.1 to about 3 weight percent iridium.
Claim 51
Dependent Claim
29 words
The process of claim 47 wherein the catalyst of the most rearward reactors of the reforming unit contains from about 0.05 weight percent to about 1 weight percent iridium.
Claim 52
Dependent Claim
46 words
The process of claim 48 wherein the catalyst of the most rearward reactors of the reforming unit contains from about 0.05 to about 1 weight percent iridium, and sufficient platinum and rhenium to provide a weight ratio of (Re+Ir):Pt ranging from about 1:5 to about 10:1.
Claim 53
Dependent Claim
138 words
In a process for reforming, with hydrogen, a naphtha feed in a reforming unit having at least one catalyst-containing on stream reactor through which the hydrogen and naphtha are heated and flowed to contact the catalyst at reforming conditions through a naphthene dehydrogenation zone, naphthenes and C 8 + paraffins isomerization and conversion zones, and C 6 -C 7 paraffin dehydrocyclization zones, the improvement comprising concentrating within the naphthenes and C 8 + paraffins isomerization and conversion zones and said C 6 -C 7 paraffin dehydrocyclization zones of the reactor a rhenium and iridium promoted platinum catalyst, the weight ratio of (rhenium+iridium):platinum being at least about 1.5:1, and concentrating within the naphthene dehydrogenation zone of the reactor a rhenium promoted platinum catalyst which contains rhenium in concentration providing a weight ratio of rhenium:platinum of up to about 1.2:1.
Claim 54
Dependent Claim
138 words
In a process for reforming, with hydrogen, a naphtha feed in a reforming unit having at least one catalyst-containing on stream reactor through which the hydrogen and naphtha are heated and flowed to contact the catalyst at reforming conditions through a naphthene dehydrogenation zone, naphthenes and C 8 + paraffins isomerization and conversion zones, and C 6 -C 7 paraffin dehydrocyclization zones, the improvement comprising concentrating within the naphthenes and C 8 + paraffins isomerization and conversion zones and said C 6 -C 7 paraffin dehydrocyclization zones of the reactor a rhenium and iridium promoted platinum catalyst, the weight ratio of (rhenium+iridium):platinum being at least about 1.5:1, and concentrating within the naphthene dehydrogenation zone of the reactor a rhenium promoted platinum catalyst which contains rhenium in concentration providing a weight ratio of rhenium:platinum of up to about 1.2:1.
Claim 55
Dependent Claim
42 words
The process of claim 50 wherein the weight ratio of (Re+Ir):Pt in the naphthenes and C 8 + paraffins isomerization and conversion zones and said C 6 -C 7 paraffin dehydrocyclization zones of the reactor ranges from about 1.5:1 to about 10:1.
Claim 56
Dependent Claim
42 words
The process of claim 51 wherein the weight ratio of (Re+Ir):Pt in the naphthenes and C 8 + paraffins isomerization and conversion zones and said C 6 -C 7 paraffin dehydrocyclization zones of the reactor ranges from about 2:1 to about 5:1.
Claim 57
Dependent Claim
154 words
In a process for reforming, with hydrogen, a naphtha feed in a reforming unit which contains a plurality of catalyst-containing on-stream reactors connected in series, the hydrogen and naphtha being heated and flowed from one reactor to another to contact the catalyst contained therein at reforming conditions through a series of naphthene dehydrogenation, naphthenes and C 8 + paraffins isomerization and conversion zones and C 6 -C 7 paraffin dehydrocyclization zones, the improvement comprising concentrating within the naphthenes and C 8 + paraffins isomerization and conversion zones and C 6 -C 7 paraffin dehydrocyclization zones within the series of reactors a rhenium and iridium promoted platinum catalyst which contains rhenium in concentration providing a weight ratio of (rhenium+iridium):platinum of at least about 1.5:1, and concentrating within the naphthene dehydrogenation zone of the series a rhenium promoted platinum catalyst which contains rhenium in concentration providing a weight ratio of rhenium:platinum of up to about 1.2:1.
Claim 58
Dependent Claim
154 words
In a process for reforming, with hydrogen, a naphtha feed in a reforming unit which contains a plurality of catalyst-containing on-stream reactors connected in series, the hydrogen and naphtha being heated and flowed from one reactor to another to contact the catalyst contained therein at reforming conditions through a series of naphthene dehydrogenation, naphthenes and C 8 + paraffins isomerization and conversion zones and C 6 -C 7 paraffin dehydrocyclization zones, the improvement comprising concentrating within the naphthenes and C 8 + paraffins isomerization and conversion zones and C 6 -C 7 paraffin dehydrocyclization zones within the series of reactors a rhenium and iridium promoted platinum catalyst which contains rhenium in concentration providing a weight ratio of (rhenium+iridium):platinum of at least about 1.5:1, and concentrating within the naphthene dehydrogenation zone of the series a rhenium promoted platinum catalyst which contains rhenium in concentration providing a weight ratio of rhenium:platinum of up to about 1.2:1.
Claim 59
Dependent Claim
43 words
The process of claim 53 wherein the weight ratio of (Re+Ir):Pt in the naphthenes and C 8 + paraffins isomerization and conversion zones and C 6 -C 7 paraffin dehydrocyclization zones of the series of reactors ranges from about 1.5:1 to about 10:1.
Claim 60
Dependent Claim
43 words
The process of claim 54 wherein the weight ratio of (Re+Ir):Pt in the naphthenes and C 8 + paraffins isomerization and conversion zones and C 6 -C 7 paraffin dehydrocyclization zones of the series of reactors ranges from about 2:1 to about 5:1.
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