1
Parc Guy, Born Maurice, Rojey Alexandre: Process for regenerating used lubricating oils. Institut Francais du Petrole, Millen Raptes & White, November 11, 1975: US3919075 (30 worldwide citation)

Used lubricating oils containing soluble metal compounds, particularly those recovered from internal combustion engines, gear-boxes and differentials, are regenerated by circulating them along a first face of a membrane permeable to hydrocarbons, preferably an ultra-filtration membrane, and collecti ...


2
Francois Audibert, Maurice Born, Daniel Defives, Xavier Marze: Process for regenerating used lubricating oils. Institut Francais du Petrole des Carburants et Lubrifiants et Entreprise de Recherches et d Activities Petrollieres Elf, Millen Raptes & White, November 9, 1976: US03990963 (22 worldwide citation)

Used lubricating oils are first heated to 200.degree.-500.degree. C, optionally with added steam, and then filtered through a membrane such as an ultra-filtration membrane. The latter has preferably a cut range of from 5,000 to 300,000.


3
Vu Quang Dang, Audibert Francois, Boucher Jean Francois, DeVille Henri: Process for regenerating used lubricating oils. Institut Francais du Petrole des Carburants et Lubrifiants, November 20, 1973: US3773658 (11 worldwide citation)

A process for regenerating used oils comprising contacting the same with a light paraffinic hydrocarbon as solvent, separating from the resulting mixture a solution of clarified oil and a residue, separating a substantial portion of the solvent from the clarified oil in a first flash zone, separatin ...


4
An improved method of separating contamination from lubricating oil. Stream Line Filter Company, Thomas Edward Beacham, January 29, 1936: GB442081-A (1 worldwide citation)

In a process for regenerating used lubricating-oils, such as from internal combustion engines, the used oil is passed through a filter F, Fig. 1, and flows through a pipe p to a still S from which diluent fuel vapours are drawn by a pump through a condenser C and the condensate flows into a receiver ...


5
Process for regenerating used lubricating oils. Inst Francais Du Petrole, May 23, 1973: GB1318150-A

1318150 Regenerating oils INSTITUT FRANCAIS DU PETROLE DES CARBURANTS ET LUBRIFIANTS 8 June 1971 [8 June 1970] 19509/71 Heading C5E Used oils (e.g. lubricating oils) are regenerated by mixing with a light paraffinic solvent, separating into clarified oil/solvent and residue/ solvent fractions, disti ...


6
Method for regeneration of used lubricant oils. Wielezynski L G, December 3, 1975: GB1415920-A

1415920 Regenerating used lubricating oils L G WIELEZYNSKI 17 Oct 1973 [20 Oct 1972] 48275/73 Heading C5E In a process for regenerating used lubricating oils the oil is sprayed in pulses into the top of a first column into which liquid propane is also introduced, removing insoluble residue of the oi ...