Process for recovering oil and sulfonates from filtration panel
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United States of America Patent
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-
Feb 17, 2004
Grant Date -
May 29, 2003
app pub date -
Apr 23, 2002
filing date -
Dec 17, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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.sub.4 -C.sub.8 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.sub.4 -C.sub.8 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.sub.4 -C.sub.8 hydrocarbons, thus recovering the sulfonate of earth-alkaline metal.
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