Process for treating heavy residues
Patent
·
OSTI ID:7089693
A process of treating a heavy residue is described which comprises subjecting the residue to distillation to separate it into a light lubricating oil fraction and all the lighter constituents, a viscous wax-containing fraction boiling in the lubricating oil range, and bottoms. The bottoms are passed under pressure together with a light hydrocarbon solvent comprising pentane and hydrocarbons lighter than pentane into a deasphaltizing zone in which an asphalt layer and a deasphaltized bottoms layer in light hydrocarbon solution is obtained. The viscous lubricating oil fraction is mixed with the deasphaltizing bottoms solution. The mixture is chilled and settled in a dewaxing zone to obtain a wax-containing bottom layer and a top layer containing a dewaxed heavy lubricating oil fraction in solution in light hydrocarbon solvent. The bottom layer is removed and the top layer is freed from the light hydrocarbon solvent to obtain a heavy lubricating oil fraction.
- Assignee:
- Standard Oil Development Co.
- Patent Number(s):
- US 1978361
- OSTI ID:
- 7089693
- Country of Publication:
- United States
- Language:
- English
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