PREMIUM SYNTHETIC LUBRICANT BASE STOCK HAVING AT LEAST 95% NON-CYCLIC ISOPARAFFINS.

摘要

A PREMIUM SYNTHETIC LUBRICATING OIL BASE STOCK HAVING A HIGH VI AND LOW POUR POINT IS MADE BY HYDROISOMERIZING A FISCHER- TROPSCH SYNTHESIZED WAXY, PARAFFINIC FEED WAX AND THEN DEWAXING THE HYDROISOMERATE TO FORM A 343 -399°C. (650 -750°F.) + DEWAXATE. THE WAXY FEED HAS AN INITIAL BOILING POINT IN THE RANGE OF ABOUT 343 - 399°C. (650 - 750°F .), FROM WHICH IT CONTINUOUSLY BOILS UP TO AT LEAST 566°C. (1050°F.) AND HAS A T90 - T10 TEMPERATURE DIFFERENCE OF AT LEAST 177°C. (350°F.). THE FEED IS PREFERABLY HYDROISOMERIZED WITHOUT ANY PRETREATMENT, OTHER THAN OPTIONAL FRACTIONATION. THE 343 - 399°C. (650 -750°F.)+ DEWAXATE IS FRACTIONATED INTO TWO OR MORE BASE STOCKS OF DIFFERENT VISCOSITY.