Process for solvent dewaxing waxy bright stock using a combination polydialkylfumarate-vinylacetate copolymer and wax-naphthalene condensate dewaxing aid.

摘要

This invention relates to processes for solvent dewaxing bright stock waxy raffinate oil employing a dewaxing aid which dewaxing aid is a mixture of (a) polydialkylfumarate/ vinyl acetate copolymers and (b) a wax-naphthalene condensate. The dewaxing aid mixture is a mixture of (a) polydialkylfumarate/vinyl acetate copolymer having a number average molecular weight in the range of from about 1,000 to 100,000, preferably, 5,000 or greater, possessing alkyl side chain moieties of from C<Sub>16</Sub>-C<Sub>24</Sub>+ in length (excluding branching) with an average pendent side chain length of predominantly (i.e. >50%) C<Sub>20</Sub>; and (b) a wax-naphthalene condensation product having a number average molecular weight of about 1,000 and greater. The combination (a) plus (b) may be employed in a weight ratio within the range of from about 45/55 to 1/100, preferably about 1/3, and at an aid dose level ranging from about 0.005 to 2.0 wt.%, preferably 0.01 to 0.2 wt.% active ingredient.