Abstract: A combination of succinic anhydride amine derivatives and tetra propenyl succinic acid derivative rust inhibitors has been found to be synergistically effective in reducing the formation of rust in lubricating oils.

Abstract: N-methyl pyrrolidone solvent (hereinafter NMP) used to extract aromatic components from lubricating oil distillates is purified by contacting the solvent with activated alumina.

Abstract: Used oils, especially used lubricating oils which are normally considered waste and are discarded or burned, are reclaimed for reuse by a re-refining procedure involving the steps of:(a) heat soaking the used oil;(b) distilling the heat soaked oil;(c) passing the distillate through a guard bed of activated material;(d) hydrotreating the guard bed treated distillate under standard hydrotreating conditions.If the used oil to be re-refined contains a quantity of water and/or fuel fraction which the practioner considers sufficiently large to be detrimental, the used oil may be subjected to a dewatering/defueling step prior to being heat soaked.

Abstract: It has been discovered that (a) poly di alkyl fumarate/vinyl acetate copolymers in combination with (B) poly alkyl (meth-) acrylate polymers are effective dewaxing aids for the solvent dewaxing of bright stocks. The poly di alkyl fumarate/vinyl acetate copolymer component of the combination dewaxing aid used in the process of the present invention has a number average molecular weight of about 1000 to 100,000 and possesses alkyl side chain moieties of from C.sub.16 -C.sub.24.sup.+ in length (excluding branching) with a pendent side chain length of predominantly (>50%) C.sub.20. The polyalkyl (meth-) acrylate is the polymeric ester of aliphatic alcohols having groups 10 to 20 carbons in length, excluding branching (pendent side chain length predominantly (>50%) C.sub.14 and lower) and acrylic or (meth-) acrylic acid (preferably methacrylic acid) and possesses a number average molecular weight of at least 5,000.

Abstract: 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) poly di alkyl fumarate/vinyl acetate copolymers and (b) a wax-naphthalene condensate. The dewaxing aid mixture is a mixture of (a) poly di alkyl fumarate/vinyl acetate copolymer having a number average molecular weight of about 1,000 to 100,000, preferably 5,000 or greater, possessing alkyl side chain moieties of from C.sub.16 -C.sub.24+ in length (excluding branching) with an average pendent side chain length of predominantly (>50%) C.sub.20 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 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.

Abstract: Transformer oil feedstocks are produced by double solvent extracting a raw, untreated, light distillate fraction from a waxy crude oil to produce a second, wax-containing extract. The second extract oil is hydrotreated to mildly crack same, reduce the sulfur content and improve the viscosity oxidation and color stability thereof. This hydrotreated oil is then distilled to produce a transformer oil feedstock of relatively low wax content as a heart cut fraction having a 5 to 95 LV% boiling range between about 595.degree. to 750.degree. F. The transformer oil feedstock may then be dewaxed using any well known method such as solvent or catalytic dewaxing to obtain a low pour point transformer oil.

Abstract: A very low pour point transformer oil is produced by a process wherein a narrow cut distillate of a paraffinic crude from conventional crude oil atmospheric or vacuum towers is first solvent extracted to remove aromatics and polar components, followed by immiscible solvent dewaxing whereby two liquid and one solid phases form a wax-containing slurry which is filtered to produce a wax cake which contains a high viscosity index oil and a filtrate which contains a very low pour point transformer oil.