Method for reducing foaming of lubricating oils

B - Operations – Transporting – 01 – D

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B01D 19/04 (2006.01) C10M 101/00 (2006.01) C10M 171/00 (2006.01)

Patent

CA 2274707

Foaming of a lube oil comprising a base stock derived from wax isomeration and an additive package is effectively reduced to within specification limits of 50 ml/ml over a temperature range of from at least 24 ~C to 93.5 ~C by adding to the oil an effective amount of an antifoamant exhibiting a spreading coefficient of at least about 2 mN/m. This has been found to be particularly effective in reducing foaming of lube oils containing a mixture of a wax isomerate oil and a petroleum oil fraction. Antifoamants typically used with conventional lube oils containing one or more petroleum fraction base stocks, but which do not exhibit a spreading coefficient of at least 2 mN/m with the wax isomerate containing oil, have been found not to be effective in reducing the foaming of the oil.

L'invention permet de réduire de manière efficace le moussage d'une huile lubrifiante qui comprend une substance de base produite par l'isomérisation de la cire et un ensemble d'additifs, dans les limites prescrites de 50 ml/ml et dans une gamme de températures comprise entre 24 et 93,5 ·C, par adjonction à l'huile d'une quantité utile d'un agent antimousse présentant un coefficient d'étalement d'au moins 2 mN/m. Ce procédé s'avère particulièrement efficace dans le cas d'huiles lubrifiantes qui comprennent un mélange d'une huile isomère de cire et d'une fraction d'huile minérale. S'agissant de la réduction du moussage de l'huile, on a constaté l'inefficacité des agents antimousse qui sont, d'une part, normalement utilisés avec des huiles lubrifiantes classiques qui contiennent une ou plusieurs substances de base d'une fraction pétrolière mais qui, d'autre part, ne présentent pas un coefficient d'étalement d'au moins 2 mN/m lorsqu'ils sont utilisés avec une huile contenant un isomérat de cire.

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