Steam reforming of polycyclic hydrocarbons
AssigneeTexaco Inc.
InventorsEdwin R. Kerr, Tansukhlal G. Dorawala, Russell R. Reinhard
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Abstract
Polycyclic aromatic hydrocarbons are treated with steam in the presence of catalyst, typically containing oxides of nickel, potassium, chromium, and aluminum, to form aromatic products containing a lesser number of aromatic rings.
Drawings
Claims19
The process for converting a charge polycyclic aromatic hydrocarbon to an aromatic product containing a lesser number of aromatic rings than said charge hydrocarbon which comprises
- passing a mixture of steam and a charge polycyclic aromatic hydrocarbon at 850.degree. F-1500.degree. F and 0-400 psig into contact with an activated supported catalyst containing oxides of (i) a Group VIB metal, (ii) a Group I A metal, and (iii) an after-deposited Group VIII metal, said supported catalyst containing Group VIII metal, expressed as metal oxide, in amount of at least about 0.5 wt % when said Group VIII metal is a noble metal and in amount of at least about 6 wt % when said Group VIII metal is iron, cobalt, or nickel, and at least about 15% by weight of said Group VIII metal, expressed as oxide, being in the form of metal thereby forming an aromatic product containing a lesser number of aromatic rings than said charge hydrocarbon;
- and
- recovering said product.
The process for converting a charge C.sub.9 to C.sub.16 polycyclic aromatic hydrocarbon to an aromatic product containing a Benzene-Toluene-Xylene fraction which comprises
- passing a mixture of steam and charge C.sub.9 to C.sub.16 polycyclic aromatic hydrocarbon at 850.degree. F-1500.degree. F and 0-400 psig into contact with an activated supported catalyst containing oxides of chromium, potassium, and nickel -- said nickel having been deposited on said support after said chromium and potassium - said nickel being present in amount of at least 6 wt % of said catalyst and at least about 15% of the nickel, expressed as oxide, being in the form of nickel metal thereby forming aromatic product containing a BTX fraction;
- and
- recovering said product.
The process for converting a charge C.sub.9 to C.sub.16 polycyclic aromatic hydrocarbon to an aromatic product containing a Benzene-Toluene-Xylene fraction which comprises
- passing a mixture of steam and charge C.sub.9 to C.sub.16 polycyclic aromatic hydrocarbon at 850.degree. F-1500.degree. F and 0-400 psig into contact with an activated supported catalyst containing oxides of chromium, potassium, and nickel -- said nickel having been deposited on said support after said chromium and potassium -- said nickel being present in amount of at least 6 wt % of said catalyst and at least about 15% of the nickel, expressed as oxide, being in the form of nickel metal thereby forming aromatic product containing a BTX fraction;
- maintaining said flow of steam and charge hydrocarbon in contact with said catalyst during a reaction period of 0.5-3 minutes during which period catalyst becomes deactivated;
- thereafter decreasing the flow of hydrocarbon charge during a regeneration period of 0.5-15 minutes during which period the catalyst is regenerated;
- subjecting said catalyst to at least one reaction period and at least one regeneration period;
- and
- recovering said product formed during a reaction period.
Dependencies are inferred from the claim text.