Brief introduction of process technology of group II base oil

The hydrogenation unit of group II lubricant base oil is combined by reaction section, hydrogen compression and fractionation section.

Based on the lubricant isodewaxing technology, the hydrocracking tail oil is processed by high pressure isodewaxing and hydrorefining processes and turned into group III lubricant base oil fraction which appears water-whited and contains quite low content of aromatic hydrocarbons, sulfur and nitrogen.

The quality of lubricant products can meet SINOPEC protocol index and specifications ofAPIIII( 4CST, 6CST and 8CST ) and API II+ (2CST)lubricant base oil.

The technical proposal of reaction section is adopted processes of mixing hydrogen with feedstock before heating furnace.And hydrogenation- isodewaxing and hydrorefining reactors are installed in cascade mode.

The technical proposal of separation section is adopted by process of cold high pressure separation.