Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
121 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 feed flowing from one reactor of the series to another to contact the catalyst contained therein at reforming conditions, the improvement comprising adding a maximum of about 0.01 percent sulfur, based on the total weight of the catalyst, to the catalyst of a reactor after the freshly prepared catalyst has been regenerated and reactivated about five times, or more, and injecting water into an on-line reactor of the series in concentration ranging from about 0.5 to about 50 wppm, based on feed, to maintain and control the sulfur level of the ctalyst.
Claim 2
Dependent Claim
121 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 feed flowing from one reactor of the series to another to contact the catalyst contained therein at reforming conditions, the improvement comprising adding a maximum of about 0.01 percent sulfur, based on the total weight of the catalyst, to the catalyst of a reactor after the freshly prepared catalyst has been regenerated and reactivated about five times, or more, and injecting water into an on-line reactor of the series in concentration ranging from about 0.5 to about 50 wppm, based on feed, to maintain and control the sulfur level of the ctalyst.
Claim 3
Dependent Claim
29 words
The process of claim 1 wherein the water is injected after about the fifth regeneration/reactivation sequence in concentration ranging from about 1 to about 20 wppm, based on feed.
Claim 4
Dependent Claim
53 words
The process of claim 1 wherein sulfur is added to the catalysts during about the first five catalyst regeneration/reactivation sequences, the sulfur added to the catalyst being progressively reduced between the first catalyst regeneration/reactivation sequence and about the fifth at which time the sulfided catalyst contains a maximum of about 0.01 percent sulfur.
Claim 5
Dependent Claim
31 words
The process of claim 1 wherein the catalysts are platinum catalyts promoted with a hydrogenation-dehydrogenation component, or components, which increase the rate of hydrogenolysis as contrasted with an unpromoted platinum catalyst.
Claim 6
Dependent Claim
13 words
The process of claim 4 wherein the platinum catalyst is promoted with rhenium.
Claim 7
Dependent Claim
137 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 catalyst is a platinum catalyst promoted with a hydrogenation-dehydrogenation component, or components, which increase the rate of hydrogenolysis as contrasted with an unpromoted platinum catalyst, the hydrogen and naphtha feed flows from one reactor of the series to another to contact the catalyst contained therein at reforming conditions, the improvement comprising adding a maximum of about 0.01 percent sulfur to the catalyst of a reactor after about the fifth sequence of regeneration and reactivation of the freshly prepared catalyst, injecting water into an on-line reactor of the series of concentration ranging from about 0.5 to about 50 wppm, based on feed, to maintain and control the sulfur level of the catalyst.
Claim 8
Dependent Claim
137 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 catalyst is a platinum catalyst promoted with a hydrogenation-dehydrogenation component, or components, which increase the rate of hydrogenolysis as contrasted with an unpromoted platinum catalyst, the hydrogen and naphtha feed flows from one reactor of the series to another to contact the catalyst contained therein at reforming conditions, the improvement comprising adding a maximum of about 0.01 percent sulfur to the catalyst of a reactor after about the fifth sequence of regeneration and reactivation of the freshly prepared catalyst, injecting water into an on-line reactor of the series of concentration ranging from about 0.5 to about 50 wppm, based on feed, to maintain and control the sulfur level of the catalyst.
Claim 9
Dependent Claim
13 words
The process of claim 6 wherein the platinum catalyst is promoted with rhenium.
Claim 10
Dependent Claim
31 words
The process of claim 6 wherein a maximum of about 0.001 percent to about 0.005 percent sulfur is added to the catalyst after about the fifth sequence of regeneration and reactivation.
Claim 11
Dependent Claim
36 words
The process of claim 6 wherein the equivalent 0.05 to 0.2 wt. % on catalyst of halide and proportionate amounts of water are injected over short term periods to rapidly remove excess sulfur from the catalyst.