Lummus Crest, Inc.

Gary L Hamilton

Andrei Rhoe

Donald P Satchell, Jr

George D Suciu

Joseph A Pisani

In the solvent refining of a residual oil, a mixture of refined oil and refining solvent, and a mixture of pitch impurities and refining solvent are introduced into separate zones of a combination tower operated at a pressure of no greater than 100 psig to recover refining solvent from each of the mixtures. The combination tower is preferably A modified crude distillation tower from a preexisting crude unit, whereby idle crude units may be converted to solvent refining.

Solvent refining of residues

Solvent refining of a residual oil is accomplished with a refining solvent containing methanol and propanol, preferably isopropanol. The solvent produces high yields of a high quality refined oil, as well as a pumpable pitch fraction.

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Little Silver, NJ, United States of America

Gary L Hamilton