Hydrodealkylation processes
AssigneeChevron Chemical Company
InventorsJohn V. Heyse, Bernard F. Mulaskey, Robert A. Innes, Daniel P. Hagewiesche, William J. Cannella, David C. Kramer
Life of this patent
Estimating the term…
Abstract
Carburization and metal-dusting while hydrodealkylating a hydrodealkylatable hydrocarbon are reduced even in the substantial absence of sulfur.
Claims79
A method for hydrodealkylating a hydrodealkylatable hydrocarbon comprising (i) treating at least a portion of a furnace or heat exchanger in a hydrodealkylation reactor system with a carburization resistant composition, and (ii) contacting said hydrocarbon in the treated reactor system with hydrogen and with hydrocarbon feeds having a sulfur content lower than about 100 ppm.
A method for hydrodealkylating a hydrodealkylatable hydrocarbon comprising (i) treating at least a portion of a furnace or heat exchanger in a hydrodealkylation reactor system with a carburization resistant composition, and (ii) contacting said hydrocarbon in the treated reactor system with hydrogen under hydrodealkylation conditions.
A method for hydrodealkylating a hydrodealkylatable hydrocarbon comprising:
- (i) providing a carburization and abrasion resistant protective layer to a steel portion of a furnace or heat exchanger in a hydrodealkylation reactor system by (a) applying to the steel portion a metal plating, cladding or other coating of a metal effective for forming a carburization resistant protective layer, to a thickness effective to isolate the steel portion from hydrocarbons during operation while avoiding any substantial liquid metal embrittlement, and (b) forming the protective layer, anchored to the steel portion through an intermediate bonding layer comprising carbide;
- (ii) hydrodealkylating a hydrodealkylatable hydrocarbon feed.
A hydrocarbon conversion process conducted with a hydrocarbon feed having a sulfur content lower than about 100 ppm, said process selected from the group consisting of nonoxidative hydrogenation of hydrocarbons to olefins and dienes, oxidative dehydrogenation of hydrocarbons to olefins and dienes, dehydrogenation of ethylbenzene to styrene, conversion of light hydrocarbons to aromatics, transalkylation of toluene to benzene and xylenes, dealkylation of alkylaromatics to aromatics, alkylation of aromatics to alkylaromatics, production of fuels and chemicals from H.sub.2 and CO, steam reforming of hydrocarbons to H.sub.2 and CO, and methanol alkylation of toluene to xylenes, comprising:
- (i) providing a carburization and abrasion resistant protective layer to a steel portion of a furnace or heat exchanger of a reactor system by (a) applying to the steel portion a metal plating, cladding or other coating of a metal effective for forming a carburization resistant protective layer, to a thickness effective to isolate the steel portion from hydrocarbons during operation while avoiding any substantial liquid metal embrittlement, and (b) forming the protective layer, anchored to the steel portion through an intermediate bonding layer comprising carbide;
- (ii) converting hydrocarbons in the reactor system.
Dependencies are inferred from the claim text.