SOLVENT DEWAXING WAXY BRIGHT STOCK USING A COMBINATION POLYDIALKYLFUMARATE-VINYL ACETATE COPOLYMER AND WAX-NAPHTHALENE CONDENSATE DEWAXING AID

摘要

ABSTRACT OF THE DISCLOSUREThis invention relates to processes forsolvent dewaxing bright stock waxy raffinate oilemploying a dewaxing aid which dewaxing aid is a mix-ture of (a) poly di alkyl fumarate/vinyl acetate co-polymers and (b) a wax-naphthalene condensate. Thedewaxing aid mixture is a mixture of (a) poly di alkylfumarate/vinyl acetate copolymer having a number aver-age molecular weight of about 1,000 to 100,000, pre-ferably 5,000 or greater, possessing alkyl side chainmoieties of from C16-C24+ in length (excludingbranching) with an average pendent side chain lengthof predominantly (50%) C20 and the olefinic radicalof which has from 2 to 30 carbon atoms, preferably 2carbons; and (b) a wax-naphthalene condensation pro-duct having a number average molecular weight of about1,000 and greater. The combination (a) plus (b) may beemployed in a weight ratio within the range from about45/55 to 1/100, preferably about 1/3, and at an aiddose level ranging from about 0.005 to 2.0 wt%, pre-ferably 0.01 to 0.2 wt% active ingredient.