PRODUCTION OF OIL FRACTIONS WITH HIGH VISCOSITY INDEX BY DEEP HYDROGENATION OF THE PETROLEUM RAW MATERIAL (POLUCHENIE MASLYANYKH FRAKTSII S VYSOKIM INDEKSOM VYAZKOSTI PUTEM GLUBOKOGO GIDRIROVANIYA NEFTYANOGO SYRYA),
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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The effect of deep hydrogenation on two types of crude the straight distillation fraction and the gas oil fraction of the catalytic cracking was studied in an effort to obtain lubricants with the viscosity of 4 and 8 centistoke at 50C. A commercial sulfide-nickel-tungsten catalyzer 3076 was used in all the experiments. High aromatic gas oil fractions were hydrogenated in two stages to lower the reaction heat. Paraffin was removed from the fractions by selective solvents. Optimal deparaffinization conditions were as follows solvent--methyl-ketone and toluene 6040 by vol the solvent-crude ratio--51 by weight cooling temperature--minus 64-66C. The output of the lube oils at 50C and -40C from the straight distillation crude was higher than that from gas oil. The hydrogenation of narrow fractions resulted in an increased production of oils of similar qualities. Best quality lube oils with viscosity 4 centistoke at 50C were obtained by hydrogenation of crudes with boiling points 300-350C at negative temperatures and under less stable conditions, while the processing of crudes with higher boiling points required more stable hydrogenation conditions for the same results.
- Industrial Chemistry and Chemical Processing
- Lubricants and Hydraulic Fluids