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US 9,540,575 B2Granted
Method for dewaxing mineral oil compositions
AssigneeEvonik Oil Additives GmbH
InventorsRene Koschabek, Torsten Stoehr, Markus Weber, Andre Unglert, Wolfgang Tschepat
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Abstract
The present invention relates to a lubricant composition for a process for reducing the paraffin content of mineral oil compositions, by providing a mineral oil composition with a dewaxing aid, cooling to form a paraffin precipitate and at least partly removing the paraffin precipitate formed. The dewaxing aid used is a copolymer mixture comprising at least three copolymers, the copolymers differing in the composition of the repeat units.
Claims11
A process for reducing a paraffin content of a mineral oil composition, the process comprising:
- adding a dewaxing aid to a mineral oil composition to obtain a mixture,
- cooling the mixture to form a paraffin precipitate, and
- at least partly removing the paraffin precipitate,
- wherein
- the dewaxing aid is a copolymer mixture comprising at least four copolymers,
- the copolymers of the copolymer mixture differ in composition of repeat units,
- and have repeat units derived from one or more alkyl methacrylates having 16 to 18 carbon atoms, and repeat units derived from one or more alkyl acrylates having 19 to carbon atoms,
- wherein the copolymer mixture is obtained by copolymerization of a monomer mixture consisting of at least one alkyl acrylate and at least one alkyl methacrylate in one polymerization step.
5 more elements
Dependencies are inferred from the claim text.