Patent ID: 7667086

Claim:
A process for producing a hydrocarbon fluid composition, the process consisting essentially of: a. contacting a feed comprising at least one C 3 to C 8 olefin and an olefinic recycle stream with a molecular sieve catalyst in a reaction zone under olefin oligomerization conditions such that the recycle to feed weight ratio is from 0.1 to 3.0, the WHSV is at least 0.5 based on the olefin in the feed, and the difference between the highest and lowest temperatures within said reaction zone is 40° F. (22° C.) or less, said contacting producing a oligomerization effluent stream; b. separating said oligomerization effluent stream into at least a hydrocarbon product stream having a first difference in initial boiling point and final boiling point temperatures, and said olefinic recycle stream, wherein the olefinic recycle stream contains no more than 10 wt % of C 10 + non-normal olefins, and the hydrocarbon product stream contains at least 1 wt % and no more than 30 wt % of C 9 non-normal olefins; and c. separating the hydrocarbon product stream into said hydrocarbon fluid composition and at least one remainder separated stream, wherein said hydrocarbon fluid composition has: i. a second difference in initial boiling point and final boiling point temperatures, wherein said second difference is less than said first difference; and ii. an aerobic biodegradability of at least 40% at 28 days.