Process for oligomer production and saturation
AssigneeUop LLC
InventorsLaurence O. Stine, Brian S. Muldoon, Steven C. Gimre, Robert R. Frame
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Abstract
A process for the production of C.sub.8 alkene isomers by the oligomerization of light olefins to heavier olefins is improved by the addition of heavy paraffins to the oligomerization zone. The recycle of the heavy paraffins improves the selectivity of the oligomerization for C.sub.8 olefin isomers that have a high octane number when saturated and reduces catalyst fouling. The saturated octane number of the resulting C.sub.8 isomers is particularly improved when the oligomerization zone is operated at reduced temperature conditions.
Claims23
An oligomerization process for the production of oligomers having high saturated octane numbers, said process comprising:
- a) passing an oligomerization zone feed comprising C.sub.3 and/or C.sub.4 olefins to an oligomerization zone and contacting the oligomerization zone feed at oligomerization conditions with an oligomerization catalyst;
- b) passing a heavy saturate stream comprising paraffins having a carbon number of at least 8 into contact with said feed and said catalyst;
- c) recovering an oligomerization effluent stream comprising said paraffins and C.sub.8 isoolefin products.
An oligomerization process for the production of oligomers having high saturated octane numbers, said process comprising:
- a) passing an oligomerization zone feed comprising C.sub.3 and/or C.sub.4 olefins to an oligomerization zone and contacting the oligomerization zone feed at oligomerization conditions;
- b) passing a heavy saturate stream comprising paraffins having a carbon number of at least 7 into contact with said feed and said catalyst to the oligomerization zone to maintain at least a portion of the combined heavy saturate stream and feed in liquid phase conditions in the oligomerization zone;
- c) recovering an oligomerization effluent stream comprising said paraffins and C.sub.8 isoolefin products.
An oligomerization process for the production of oligomers having high saturated octane numbers, said process comprising:
- a) passing an oligomerization zone feed comprising C.sub.3 and/or C.sub.4 olefins to an oligomerization zone and contacting the oligomerization zone feed at oligomerization conditions with an oligomerization catalyst having a Hammett acidity function of less than about -6.0;
- b) passing a heavy saturate stream comprising paraffins having a carbon number of at least 7 into contact with said feed and said catalyst;
- c) recovering an oligomerization effluent stream comprising said paraffins and C.sub.8 isoolefin products.
A process for the production of high octane C.sub.8 isomers by the oligomerization of an isobutene containing feed stream, said process comprising:
- a) passing an oligomerization zone feed comprising C.sub.4 olefins and a paraffin recycle stream comprising paraffins having at least eight carbon atoms to an oligomerization zone and into contact with an oligomerization catalyst at oligomerization conditions including a temperature of 200 to 500 F..degree., a pressure of 100 to 1000 psig, and an LHSV of 0.5 to 5;
- b) recovering an oligomerization effluent stream comprising said paraffin stream and C.sub.8 isoolefins;
- c) passing said oligomerization effluent stream to a separation zone and separating said effluent stream into a lighter fraction comprising C.sub.8 isoolefins and a heavier fraction comprising paraffins having at least 8 carbon atoms;
- d) rejecting at least portion of said heavy fraction;
- and,
- e) passing at least a portion of said heavy fraction to said oligomerization zone as said paraffin recycle stream.
Dependencies are inferred from the claim text.