Agip Petroli S.p.a.

Eni S.p.a.

Orazio Pianta

Paolo Koch

Marcello Notari

Luigi D'Elia

Luigi D'elia

Massimo Manni

Process for treating filtration panels obtained by the filtration of oils containing sulfonates of earth-alkaline metal, the above filtration being carried out in the presence of filter aids essentially consisting of siliceous material, which comprises: (a) dilution of the filtration panel with a C -C aliphatic hydrocarbon, preferably hexane, and addition of another filter aid, thus obtaining a suspension of the panel and of the filter aid in the aliphatic hydrocarbon; (b) filtration of the suspension of step (a), thus obtaining a solid essentially consisting of filter aid with a minimum content of sulfonate and a turbid C -C hydrocarbon solution (i); (c) centrifugation of the turbid hydrocarbon solution (i), thus obtaining a solid and a purified hydrocarbon solution (ii); (d) treatment of the purified hydrocarbon solution (ii) with means suitable for eliminating the C -C hydrocarbons, thus recovering the sulfonate of earth-alkaline metal.

Process for recovering oil and sulfonates from filtration panel

Oil-soluble additives with dispersant properties inert towards fluoroelastomers are described, prepared by reacting an alkyl or alkenyl disuccinimide with an anhydride of an unsaturated bicarboxylic aliphatic acid or the corresponding acid. The reaction is conducted at a temperature of between 130.degree. and 170.degree. C. The molar ratio of anhydride to disuccinimide is between 1.05 and 1.95

Oil-soluble adducts of disuccinimides and anhydrides of unsaturated

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