Patent ID: 7728093
Filing Date: 2010-06-01
Classification: C08F,C08L,C10G

Abstract:
1. A method for solvent deparaffinization of paraffinic mineral oil distillates, comprising: adding a dewaxing additive and a solvent to said paraffinic mineral oil distillates, to obtain a solvent-paraffinic mineral oil mixture; stirring until a clear solution results; cooling the solution to below −20° C. at a defined rate, thereby forming paraffin crystals which form a filter cake which is porous and permeable to the solution; and separating said paraffin crystals from said solution by filtration; increasing a filtration volume per filtration time compared to the filtration volume per filtration time using no dewaxing additive; and obtaining deparaffinized mineral oil distillates; wherein said dewaxing additive comprises a copolymer of the following free-radically polymerizable monomers of Formulae A and B: wherein R R R or R or R or R or R wherein R R optionally further customary dewaxing additives.