Hydrodealkylation processes
AssigneeChevron Chemical Company
InventorsJohn V. Heyse, Bernard F. Mulaskey, Robert A. Innes, Daniel P. Hagewiesche, William J. Cannella, David C. Kramer
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Abstract
Carburization and metal-dusting while hydrodealkylating a hydrodealkylatable hydrocarbon are reduced even in the substantial absence of added sulfur.
Claims68
A method for hydrodealkylating a hydrodealkylatable hydrocarbon comprising (i) treating at least a portion of a hydrodealkylation reactor system with a carburization resistant composition, and (ii) contacting said hydrocarbon in said treated reactor system with hydrogen under low sulfur hydrodealkylation conditions of 100 ppm or less.
A method for hydrodealkylating a hydrodealkylatable hydrocarbon comprising:
- (i) providing a carburization and abrasion resistant protective layer to a steel portion of 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 wherein the sulfur levels in the reactor system do not exceed 100 ppm.
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 dehydrogenation 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 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 carbide-rich bonding layer comprising carbide;
- (ii) converting hydrocarbons in the reactor system.
Dependencies are inferred from the claim text.