Loading patent…
AssigneeExxon Research & Engineering Co.
InventorsRobert J. Wittenbrink, Daniel F. Ryan, Paul J. Berlowitz, Jacob J. Habeeb
Estimating the term…
A wide-cut lubricant base stock is made by hydroisomerizing and then catalytically dewaxing a waxy Fischer-Tropsch synthesized hydrocarbon fraction feed and comprises the entire dewaxate having an initial boiling point in the 650-75O° F.+ range. Formulated lubricating oils made by admixing the base stock with a commercial automotive additive package meet all specifications, including low temperature properties, for multigrade internal combustion engine crankcase oils. The waxy feed has an initial boiling point in the 650-750° F. range and continuously boils to an end point of at least 1050° F.+. Lower boiling hydrocarbons produced by the process are separated from the base stock by simple flash distillation. The base stock comprises the entire dewaxate having an initial boiling point in the 650-750° F. range.
An isoparaffinic lubricant base stock obtained by (i) hydroisomerizing a paraffinic, Fischer-Tropsch synthesized, waxy hydrocarbon feed having an initial boiling point in the range of 650-750° F., which continuously boils to an end boiling point of at least 1050° F., to form a hydroisomerate having an initial boiling point in said 650-750° F. range, (ii) catalytically dewaxing said hydroisomerate to reduce its pour point and form a dewaxate comprising said base stock having an initial boiling point in said 650-750° F. range, and which continuously boils up to its end boiling point, which is the end boiling point of said dewaxate, and which contains hydrocarbons boiling below said 650-750° F. range, and (iii) removing said lower boiling hydrocarbons from said dewaxate to form said base stock.
A wide-cut, isoparaffinic lubricant base stock is obtained by (i) hydroisomerizing a paraffinic, Fischer-Tropsch synthesized, waxy hydrocarbon feed having an initial boiling point in the range of 650-750° F., which continuously boils to an end boiling point of at least 1050° F. and has a T90-T10 temperature spread of at least 350° F., by reacting said feed with hydrogen in the presence of a hydroisomerization catalyst comprising Group VIII and Group VIB metal catalytic components on a support comprising silica-alumina having a silica content of less than 50 wt. %, to form a hydroisomerate having an initial boiling point in said 650-750° F. range, (ii) catalytically dewaxing said hydroisomerate to reduce its pour point and form a dewaxate comprising a base stock fraction having an initial boiling point in said 650-750° F. range and which continuously boils up to its end boiling point, which is the end boiling point of said dewaxate, said dewaxate also containing hydrocarbons boiling below said 650-750° F. range, and (iii) removing said lower boiling material from said dewaxate to form said base stock which has a VI of at least 120 and a pour point no higher than −10° C.
Dependencies are inferred from the claim text.