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US 5,759,385 AGranted
Process and plant for purifying spent oil
AssigneeInstitut Francais du Petrole
InventorsMarcel Aussillous, Patrick Briot, Pierre-Henri Bigeard, Alain Billon
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Abstract
The invention concerns a process and plant for purifying spent oil, comprising dehydration, preferably by atmospheric distillation, directly followed by vacuum distillation producing a residue and at least one distilled oil fraction. The vacuum residue directly undergoes solvent extraction and the clarified oil obtained and the distilled oil fraction(s) undergo finishing hydrotreatment.
Claims17
A process for purifying spent oil, comprising the successive steps of:
- (a) subjecting spent oil to dehydration to obtain a dehydrated spent oil;
- (b) directly vacuum distilling said dehydrated spent oil to produce a residue and at least one distilled oil fraction with optional cooling of said residue thereafter;
- (c) directly subjecting said residue to solvent extraction to obtain an extraction residue and a fraction containing clarified oil and solvent and optionally separating the solvent from said fraction and recycling the solvent to the extraction;
- (d) stabilizing said at least one distilled oil fraction and the clarified oil by hydrotreatment;
- and
- (e) optionally mixing the extraction residue with a viscosity reducing agent.
3 more elements
Dependencies are inferred from the claim text.