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- Nachgewiesen in: USPTO Patent Applications
- Sprachen: English
- Document Number: 20150315493
- Publication Date: November 5, 2015
- Appl. No: 14/564879
- Application Filed: December 09, 2014
- Assignees: AXENS (Rueil Malmaison Cedex, FR)
- Claim: 1. Process for the production of technical white oils meeting the specification according to the standard 21 CFR178.3620(b) from waste oils originating from industrial use or use in engines comprising the following sequence of stages: a dehydration stage making it possible to eliminate the water, the light hydrocarbons and the light additives, a stage of vacuum distillation (or vacuum fractionation, or vacuum distillation in a thin-film evaporator), a demetallization stage, a first deep hydrotreatment stage taking place in the presence of a supported nickel- and molybdenum-based, or nickel- and tungsten-based catalyst, under the following operating conditions: temperature comprised between 250° C. and 450° C., preferably comprised between 280° C. and 400° C., and more preferably comprised between 300° C. and 380° C., a pressure comprised between 15.5 MPa and 25 MPa, preferably comprised between 15.8 MPa and 23 MPa and more preferably comprised between 16 MPa and 21 MPa. LHSV comprised between 0.1 and 10 h−1, preferably comprised between 0.1 and 5 h−1 and more preferably comprised between 0.2 and 3 h−1. flow rate of hydrogen comprised between 100 normal litres/litre of feedstock and 3000 normal litres/litre of feedstock, preferably comprised between 500 normal litres/litre of feedstock and 2000 normal litres/litres of feedstock, a second stage of hydrotreatment essentially consisting of a hydrogenation of the aromatic hydrocarbons contained in the effluent from the first stage of hydrotreatment in the presence of a catalyst based on noble metals selected from the list: Pt, Pd, Ru, Rh, said noble metal or metals being deposited on any type of support for example silica, alumina, silica-alumina, zirconium, titanium oxide or a mixture thereof in any proportions, and the operating conditions being as follows: Pressure comprised between 5 and 25 MPa, preferably comprised between 8 and 20 MPa, LHSV comprised between 0.1 and 10 h-1, preferably comprised between 0.2 and 3h-l, and Temperature comprised between 150 and 450° C., preferably between 200 and 400° C.
- Claim: 2. Process for the production of technical white oils according to claim 1, in which the dehydration stage comprises preheating the oil, either in an exchanger, or in a specially equipped oven at a temperature comprised between 50° C. and 200° C., preferably between 80° C. and 150° C.
- Claim: 3. Process for the production of technical white oils according to claim 1, in which the dehydration stage is coupled with a distillation such that the temperature of said distillation is maintained below 250° C., and preferably between 100° C. and 200° C., even more preferably between 120° C. and 150° C.
- Claim: 4. Process for the production of technical white oils according to claim 1, in which the demetallization stage is carried out at a temperature comprised between 200° C. and 400° C. and a pressure comprised between 0.5 MPa and 30 MPa with an LHSV comprised between 0.1 and 10 h−1.
- Claim: 5. Process for the production of technical white oils according to claim 1, in which the demetallization stage uses a catalyst comprising at least one oxide or sulphide of a group VIIIB metal, preferably nickel or cobalt, and/or at least one oxide or sulphide of a group VIB metal, preferably chromium, molybdenum or tungsten.
- Claim: 6. Process for the production of technical white oils according to claim 1, in which the catalyst used in the demetallization stage comprises several group VIIIB metals, with a group VIIIB metal content comprised between 1 wt % and 10 wt % and a group VIB metal content comprised between 1 wt % and 30 wt % and preferably comprised between 2 wt % and 15 wt %.
- Claim: 7. Process for the production of technical white oils according to claim 1, in which the stage of deep hydrotreatment uses a catalyst comprising nickel, molybdenum and an alumina-based support.
- Claim: 8. Process for the production of technical white oils according to claim 1, in which the demetallization and deep hydrotreatment stages are carried out under the same temperature, pressure and LHSV conditions.
- Claim: 9. Process for the production of medicinal or edible white oils according to claim 1, in which the second stage of hydrotreatment uses a catalyst based on noble metals selected from the sub-list Pt or Pd, and preferably being restricted to Pt, said noble metal or metals being deposited on any type of support, preferably silica, alumina or silica-alumina, and very preferably alumina.
- Current International Class: 10
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