Hydrorefined lube oil and process of manufacture

Abstract

Abstract A novel hydrorefined oil of improved stability under severe conditions of use has a viscosity in the range of 150-12,000 SUS at 100*F., contains 10-44 percent gel aromatics and less than 10 p.p.m. (preferably less than 5 p.p.m., more preferably less than 2 p.p.m. of basic nitrogen). Typically, such an oil can contain more than 10 p.p.m. of total nitrogen (e.g., 15-600 p.p.m.) depending on the viscosity of the oil. Preferably the hydrorefined oil is naphthenic or aromatic (by VGC classification). The basic nitrogen in such severely hydrorefined lube oils (typically 15-400 p.p.m.) can be reduced to less than 10 p.p.m. by a process comprising contacting the hydrorefined oil with an acidic adsorbent (such as an adsorbent comprising an acid-activated clay), preferably at 50*-150*F., or by contacting the hydrorefined oils with sufficient quantities of a mineral acid (e.g. 90-120 percent H2SO4) followed by a basic wash finished by adsorbent contact (as with a fuller''s earth bleaching clay).

Inventors

• 👤 I Mills
• 👤 G Dimeler

Bibliographic Details