Patent ID: 7956227

Claim:
A process comprising: (1) separating a hydrocarbon stream in a separation zone to provide a separated product comprising olefins; (2) contacting said olefins with at least one guard bed to provide pretreated olefins, wherein said guard beds contain a compound selected from the group consisting of a 3 Angstrom molecular sieve, silica gel and a 13X sieve, (3) contacting said pretreated olefins with a catalyst comprising a zeolite in an oligomerization zone under oligomerization reaction conditions to form an oligomerization product; and (4) recovering said oligomerization product; wherein the reid vapor pressure of the hydrocarbon stream is higher than the reid vapor pressure of the oligomerization product and a feed comprising 10 wt% 1-butene and 1 wt% isobutene in isopentane would have greater than 99% conversion at 55 hours with a selectivity to C 8 of 35.91 wt% wherein said zeolite is treated with a compound comprising a metal selected from the group consisting of tin prior to said contacting with said olefins in step (3).