see, in particular, continuously avparaffinera liquid kolveteblandningar or mineral oils by adduktbildning of n - paraffin with urea

摘要

Mineral oils containing small amounts (less than 2 weight percent) of normal paraffins may be urea dewaxed to produce refrigerator oils having Freon cloud or flock points of at least minus 55 DEG C. by utilizing large excesses of the amount of crystalline urea theoretically required for complete conversion of the n-paraffins into solid adduct and conducting the adduct formation under conditions of vigorous agitation.