Olefin oligomerization with surface modified zeolite
AssigneeMobil Oil Corporation
InventorsNancy M. Page, Lewis B. Young
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Abstract
A process 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 siliceous acidic ZSM-23 zeolite 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 neutralized by a bulky pyridine compound having an effective cross-section larger than the zeolite pore. The preferred deactivating agent is 2,4,6-collidine, which may be applied to the zeolite as a pretreatment or added with olefin feed in a continuous process.
Claims7
A process for producing substantially linear hydrocarbons by oligomerizing a lower olefin at elevated temperature and pressure which comprises
- contacting the lower olefin under polymerization conditions with 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, said zeolite surface being neutralized by contacting HZSM-23 with 2,4,6-collidine.
A multi-stage process 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 ZSM-23 zeolite catalyst having Bronsted acid activity;
- wherein said zeolite has acidic pore activity and wherein the zeolite surface is rendered substantially inactive for acidic reactions, said zeolite surface being neutralized by contacting HZSM-23 with 2,4,6-collidine, thereby producing substantially linear C.sub.10.sup.+ 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.