Exxon Research and Engineering Company

Cedric L Briens

Bruce M Sankey

Patrick C Ewener

This invention relates to solvent dewaxing processes for dewaxing waxy hydrocarbon oil distillates employing a dewaxing aid which dewaxing aid is a mixture of (a) a poly-dialkylfumarate/vinyl acetate copolymer and (b) a wax-naphthalene condensation product. Component (a) has pendent alkyl side chain groups of from 16 to 30 carbon atoms in length (excluding branching) with an average pendent side chain carbon length of predominantly (&gt;50%) C.sub.22. Component (a) has a number average molecular weight of from about 1,000 to 100,000 preferably greater than about 5,000. Component (b) has a number average molecular weight of at least about 1,000. The combination (a) and (b) may be employed in a weight ratio (A)/(B) within the range from about 1/10 to 20/1 preferably about 1/3 to 6/1 most preferably about 3/1 and at an aid dose level ranging from about 0.005 to 2.0 wt. % preferably 0.01 to 0.2 wt. % active ingredient.

Solvent dewaxing waxy hydrocarbon distillate oils using a combination

This invention relates to solvent dewaxing processes, for dewaxing waxy hydrocarbon oils using a dewaxing aid, which dewaxing aid comprises a mixture of (A) polyalkyl arcylate having alkyl group side chain length of from 10-26 carbons (excluding branching) and (B) an n-alkyl methacrylate polymer having alkyl group side chain length of from 10-20 carbons (excluding branching). Component (A) typically has a number average molecular weight of from 3,000 to 500,000 while component (B) typically has a number average molecular weight of from 5,000 to 200,000. The combination (A) plus (B) may be employed in a weight ratio within the range from about 1/100 to 100/1, preferably about 1/6 to 2/1 and at an aid does level ranging from about 0.01 wt % to 1 wt %, preferably 0.02 to 0.2 wt % active ingredient.

Solvent dewaxing waxy hydrocarbon distillates using a combination poly

This invention relates to processes for solvent dewaxing waxy hydrocarbon oil distillates employing a dewaxing aid which dewaxing aid is a mixture of (a) poly(meth-)acrylate polymers and (b) polydialkylfumarate/vinyl acetate copolymers. The dewaxing aid mixture is selected from the group of mixtures consisting of a mixture of (a) poly(meth-)acrylate polymer which is an ester of a C.sub.10 to C.sub.22 aliphatic alcohol with acrylic or methacrylic acid and has a number average molecular weight greater than about 5,000 and (b) polydialkylfumarate/vinyl acetate copolymer wherein the pendent alkyl side chain group contains from 16-30 carbon atoms but is primarily i.e. &gt;50% C.sub.22 (preferably behenyl), and the component (B) has a number average molecular weight of about 1,000 to 100,000, preferably about 5,000 to 50,000. The combination (a) plus (b) may be employed in a weight ratio within the range of from about 100/1 to 1/100, preferably about 8/1 to 1/4, more preferably about 8/1 to 1/1 most preferably about 3/1 a/b, and at an aid dose level ranging from about 0.01 to 1 wt. %, preferably between about 0.02 to 0.2 wt. % active ingredient. The solvent dewaxing of bright stocks can also be benefitted by using as a dewaxing aid a combination consisting of component B recited above and a component A which is a polymethacrylate copolymer having an average pendent carbon side chain length of predominantly i.e. &gt;50% C.sub.16 and higher.

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Richmond, Canada

Cedric L Briens