Oil for use in printing inks

Abstract

Abstract An improved ink oil is prepared by a process wherein a topped naphthenic or mildly aromatic crude is heated and flash distilled under vacuum in a first distillation step to remove gas oil and lubricating oil fractions and a heavy residuum containing asphaltic and/or high molecular weight naphthenic acid components is obtained, and (a) subjecting said heavy residuum to vacuum distillation in a second distillation step at a pressure lower than that to which the residuum was subjected in said first distillation step; (b) separating from the second distillation step a heavy distillate having an initial ASTM D-1500 color greater than 7.5, SUS viscosity at 100*F. in the range of 810014,000 SUS, a 260 UVA greater than 12.0 (and, typically containing high molecular weight naphthenic acids); (c) catalytically hydrogenating said heavy distillate at a temperature in the range of 500*-775*F., with H2 of 50-100% purity, and from 800-3000 p.s.i. of hydrogen at the reactor inlet (at total pressures from 800-6000 p.s.i.g.) at a fresh feed liquid hourly space velocity (LHSV) of from 0.1-8.0; and (d) recovering hydrogenated oil useful as a printing ink oil and having an initial ASTM D-1500 color no greater than 2.5, a viscosity in the range of 5000-12,000 SUS at 100*F., an API gravity at 60*F. in the range of 15.5-18.5, a refractive index in the range of 1.51-1.53, a 260 UVA less than 10.0, a flash point above 425*F., a pour point greater than 10*F. and which contains at least 40 wt. % gel aromatics.

Inventors

• 👤 I Mills
• 👤 G Dimeler
• 👤 W Atkinson
• 👤 J Hoffman

Bibliographic Details