CATALYTIC DEWAXING PROCESS

摘要

A process for making a lubricant oil of low pour point and improved oxidation stability by catalytically hydrodewaxing a lube chargestock containing paraffin wax in a vertical column reactor (10) having a series of fixed downflow catalyst beds (12A, B and C) over dewaxing catalyst comprising acid medium pore size zeolite. The treatment is carried out by selectively hydrodewaxing paraffinic wax contained in the liquid petroleum in a first serial catalyst bed (12A) under adiabatic cracking temperature conditions, recovering partially hydrodewaxed liquid petroleum from a bottom portion of the first serial catalyst bed (15A), and redistributing the partially hydrodewaxed liquid petroleum for contact with the catalyst in at least one downstream fixed catalyst bed (12B, 12C). The partially hydrocracked liquid petroleum is further reacted to effect endothermic hydrogen transfer, dewaxing, hydrogenation and cyclization in the presence of hydrogen under adiabatic temperature conditions.