Patent ID: 11873263
Assignee: EXXONMOBIL CHEMICAL PATENTS INC.
Field: Organic fine chemistry (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A process for oligomerizing propylene to form a Cn, olefin, wherein the process comprises:
contacting a feed stream comprising X wt % propylene, Y wt % an alkane diluent, and Z wt % a recycle fraction with a solid phosphoric acid oligomerization catalyst under effective oligomerization conditions in an oligomerization reactor to produce an oligomerization effluent; and
fractionating the oligomerization effluent to obtain a product fraction and the recycle fraction, the product fraction comprising the Cn, olefin and the recycle fraction comprising a Cn-3 olefin;
wherein the recycle fraction comprises at least 80 wt % of the Cn-3 olefin, based on the weight of the recycle fraction;
wherein X+Y+Z=100 and X is from 25 to 60, Y is from 5 to 50, and Z is from 20 to 70; and
wherein the process comprises:
at least one period T1 during which n is 9 and X, Y and Z remain constant; and
at least one period T2 during which n is 12 and X, Y, and Z remain constant, wherein at least two of X, Y and Z during period T2 differ by at least 5 from X, Y and Z during period T1.