Olefin oligomerization with surface modified zeolite catalyst
AssigneeMobil Oil Corporation
InventorsMinas R. Apelian, James R. Boulton, Anthony S. Fung
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Abstract
A method for producing substantially linear hydrocarbons by oligomerizing a lower olefin at elevated temperature and pressure which comprises contacting the lower olefin under oligomerization/polymerization conditions with constrained intermediate pore siliceous acidic zeolite, e.g., ZSM-22, -23 or -35, having Bronsted acid activity; wherein the zeolite has acidic pore activity and wherein the zeolite surface is rendered substantially inactive for acidic reactions. The zeolite surface can be inactivated by contact with dicarboxylic acid, e.g., oxalic acid. The olefin oligomers may be used as alkylating agents to prepare biodegradable alkylbenzenes and alkylphenylsulfonates.
Claims20
A method for producing substantially linear hydrocarbons by oligomerizing/polymerizing a lower olefin at elevated temperature and pressure which comprises
- contacting the lower olefin under oligomerization/polymerization conditions with a catalyst comprising a siliceous acidic zeolite having Bronsted acid activity, capable of sorbing 10 to 40 mg 3-methylpentane at 90.degree. C., 90 torr, per g dry zeolite when in the hydrogen form, wherein said zeolite has acidic pore activity and wherein the zeolite surface is rendered substantially inactive for acidic reactions by having been contacted with dicarboxylic acid under conditions sufficient to effect a reduction of at least 20% in surface acidity of the zeolite as determined by tri-tertiarybutylbenzene conversion without substantially reducing the overall activity of the zeolite as indicated by alpha value.
A method for producing substantially linear hydrocarbons by oligomerizing/polymerizing a lower olefin at elevated temperature and pressure which comprises
- contacting the lower olefin under oligomerization/polymerization conditions with acidic aluminosilicate ZSM-23 zeolite having Bronsted acid activity;
- wherein said zeolite has acidic pore activity and wherein the zeolite surface is rendered substantially inactive for acidic reactions by contacting with oxalic acid under conditions sufficient to effect a reduction of at least in surface acidity of the zeolite as determined by tri-tertiarybutylbenzene conversion.
A multi-stage method for producing high viscosity index lubricating oils from lower olefin feed which comprises
- contacting the lower olefins in a primary reaction zone under conditions of elevated temperature and pressure with a siliceous acidic ZSM-23 zeolite having Bronsted acid activity;
- wherein said zeolite has acidic pore activity and wherein the zeolite surface is rendered substantially inactive for acidic reactions by contacting with oxalic acid under conditions sufficient to effect a reduction of at least 20% in surface acidity of the zeolite as determined by tri-tertiarybutylbenzene conversion, to produce substantially linear C.sub.10 .sup.+ intermediate olefins;
- and
- contacting at least a portion of the primary stage effluent in a secondary reaction zone with an acid catalyst to effectively polymerize the C.sub.10 .sup.+ hydrocarbons.
Dependencies are inferred from the claim text.