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US 5,843,384 AGranted
Plant for purifying spent oil
AssigneeInstitut Francais du Petrole
InventorsMarcel Aussillous, Patrick Briot, Pierre-Henri Bigeard, Alain Billon
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AssigneeInstitut Francais du Petrole
InventorsMarcel Aussillous, Patrick Briot, Pierre-Henri Bigeard, Alain Billon
Estimating the term…
The invention concerns a plant for purifying spent oil, including apparatus for 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.
A plant for purifying spent oil, comprising:
A plant for purifying spent oil, comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
By thermal processes: using distillation processes; devices therefor
Working-up used lubricants to recover useful products ; Cleaning: using extraction processes; apparatus therefor
Lubricating compositions
Term ended 17 Oct 2015 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
The present invention concerns a plant for purifying spent oil, i.e., a treatment which is intended to produce at least one base oil which can be used again.
Such oils are mineral hydrocarbon oils in particular, normally from oil sources, usually containing various additives such as rust inhibitors, antioxidants, emulsifiers, viscosity control additives, etc., whose properties are degraded after use for a greater or lesser period in an internal combustion engine as lubricants. They then contain substances such as carbonaceous residues, oxidized, substances, water and unburned hydrocarbons and they must then be drained out.
Spent oil contains a multitude of contaminating elements since nearly all the groups in the periodic classification can be represented, as will be explained below.
The description of the invention will be more easily comprehended using the diagram of the process and plant in FIG. 1.
The spent oil feed(s), H with any suspended particles removed by filtering, for example through a sieve, is introduced into dehydration zone 2.
The dehydration techniques are those used in the majority of oil regeneration systems.
Normally, advantageously after preheating the oil in a specially equipped oven, the unprocessed oil is distilled at low temperature to remove water (generally 2% to 4%).