United States Patent   Patent Number: 4,914,254
Pelrine  Date of Patent: Apr. 3,1990
 FIXED BED PROCESS FOR HIGH VISCOSITY INDEX LUBRICANT
 Inventor: Bruce P. Pelrine, Trenton, N.J.
 Assignee: Mobil Oil Corporation, New York, N.Y.
 Appl. No.: 282,769
 Filed: Dec. 12,1988
 Int..O* C07C 2/02
 U.S. CI 585/530; 585/10
 Field of Search 585/10, 530
 References Cited
U.S. PATENT DOCUMENTS
2,825,721 3/1958 Hoqam et al 585/530
4,827,064 5/1989 Wu 585/10
4,827,073 5/1989 Wu 585/530
Primary Examiner— Curtis R. Davis
Attorney, Agent, or Firm—Alexander J. McKillop;
Charles J. Speciale; Malcolm D. Keen
A process is disclosed to produce liquid oligomers from alpha-olefins feedstock, such as 1-decene, wherein said oligomers have branch ratios below 0.19 and have higher viscosity indices than oligomers with higher branch ratios. The olefins can be oligomerized over a supported and reduced metal oxide catalyst from Group VIB of the Periodic Table to give oligomers suitable for lubricant application. A preferred catalyst is lower valence state chromium on silica support. Surprisingly, it has been found that in the oligomerization of the alphaolefins in a fixed bed reactor containing extruded catalyst the viscosity of the lubricant produced can be selectively controlled by carrying out the oligomerization at essentially constant oligomerization temperature while varying the olefin feedstock weight hourly space velocity (WHSV), based on catalyst, in correspondence with the preferred product viscosity.
11 Claims, 3 Drawing Sheets