Patent ID: 6692644
Filing Date: 2004-02-17
Classification: C07C,C07G,C10M

Abstract:
A process for treating filtration panels obtained by the filtration of oils containing sulfonates of earth-alkaline metal, wherein said filtration is performed in the presence of one or more siliceous filter aids, and said process comprises:(a) diluting the filtration panel with a C4-C8 aliphatic hydrocarbon and adding an additional siliceous filter aid, thus obtaining a suspension of the panel and the filter aids in the aliphatic hydrocarbon; (b) filtering the suspension of (a), thus obtaining a solid essentially consisting of the filter aids with a minimum content of sulfonate and a turbid C4-C8 hydrocarbon solution (i); (c) centrifuging the turbid hydrocarbon solution (i), thus obtaining a solid and a purified hydrocarbon solution (ii); (d) treating the purified hydrocarbon solution (ii) with a means for eliminating the C4-C8 hydrocarbons, thus recovering the sulfonate of earth-alkaline metal.