Thermal and Catalytic Processes, : 674– 677. Hydroisomerisation of lube oils and medium fractions. Lubricant Base Oil & Wax Processing, : 81– 194. Though modern catalytic aromatic saturation and dewaxing ( Sequeira and Dekker, 1993a Sequeira, A. Finally this dewaxed oil is selectively hydrogenated to remove unwanted sulfur, nitrogen, and oxygen and also for improving color. In order for the pour point to be improved, selective removal of paraffin wax is carried out in a solvent dewaxing unit. 153) next to selectively dearomatize the distillates to yield high viscosity index (VI) oil. Solvent dewaxing & wax deoiling processes. Solvent refining of lubricating base oil stocks. Solvent extraction takes place ( Sequeira and Dekker, 1993c Sequeira, A. Highly viscous distillate is also recovered from the vacuum residue. In a typical lubricating base oil–producing refinery, viscous distillates from intermediate to heavy are available from such a unit. Reduced crude oil (RCO) from the atmospheric distillation unit is further distilled under a vacuum, yielding varieties of distillates like vacuum gas oil and light to heavy viscous distillates. In a refinery, crude petroleum oil is distilled in an atmospheric column to separate fuel gases and distillates.
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