Abstract: An electric discharge machine fluid has been discovered. The fluid comprises a naphthene oil and 0.15 to 0.50 wt % 1,6-hexamethylene bis(3,5-ditertiarybutyl-4-hydroxycinnamate). The fluid was found to increase the breakdown voltage of the fluid and to stabilize oxidative deterioration.

Abstract: In a solvent refining process a naphthenic lubricating oil feedstock is solvent extracted to yield a primary aromatics-lean raffinate and a primary aromatics-rich extract. Polynuclear aromatic content of primary raffinate is controlled by manipulating extraction temperature and solvent dosage. Primary extract is separated (settled) to form a secondary raffinate and a secondary extract. Secondary raffinate is recycled to solvent extraction. The refractive index of secondary raffinate is controlled by manipulating settling temperature and antisolvent dosage. The refractive index of secondary raffinate is maintained at or below the refractive index of feedstock. An improved yield of primary raffinate of a specified polynuclear aromatic content is achieved.

Abstract: An improvement has been found in a process for producing Bright Stock from petroleum residuum by propane deasphalting and solvent refining. The extract of solvent refining is cooled to yield an aromatics-lean secondary raffinate which is recycled to propane deasphalting. An improved yield of Bright Stock is achieved over recycling extract to propane deasphalting.

Abstract: In a solvent refining process a lubricating oil stock is solvent extracted to yield a primary aromatics-lean raffinate and a primary aromatics-rich extract. Aromatics content of primary raffinate is controlled by manipulating extraction temperature and solvent dosage. Primary extract is separated (settled) to form a secondary raffinate and a secondary extract. The aromatics content of secondary extract is controlled by manipulating settling temperature.

Abstract: The control system and method of the present invention controls a solvent refining unit which treats charge oil with a solvent in a refining tower to yield raffinate and extract-mix, strippers separate the solvent from the raffinate and from the extract-mix to provide refined waxy oil and extract oil, respectively. The solvent is returned to the tower and the refined waxy oil is subsequently dewaxed to provide refined oil. The present invention includes a device which senses the flow rate of the charge oil and provides a corresponding charge oil flow rate signal. The flow rate of the charge oil is controlled in accordance with the charge oil flow rate signal and a control signal. The temperature of the extract oil is sensed and a corresponding temperature signal provided. The temperature signal is used in controlling the temperature of the extract oil in cooperation with a second control signal.

Abstract: In an improved urea dewaxing process a urea/alcohol slurry chilled to 60.degree. F. to 65.degree. F. is added to a naphthenic distillate chilled to 60.degree. F. to 65.degree. F. to produce a refrigerator oil with improved low temperature properties.

Abstract: A used lubricating oil is reclaimed by vacuum distillation. The bottoms is vacuum pyrolyzed with limestone to form a virtually insoluble coked mass containing insoluble metal carbonates and free metal. This solid coked residuum is suitable for landfilling.

Abstract: An improved process for solvent refining lubricating oil base stocks from petroleum fractions containing both aromatic and non-aromatic constituents utilizing N-methyl-2-pyrrolidone as a selective solvent for aromatic hydrocarbons wherein the refined oil fraction and the extract fraction are freed of final traces of solvent by stripping with gaseous ammonia.The process has several advantages over conventional processes including a savings in energy required for the solvent refining process, and reduced corrosion of the process equipment.

Abstract: A transformer oil processing sequence is disclosed. The process comprises contacting a naphthenic based oil with an oxygen-containing gas in the presence of a permanganate under mild oxidation conditions of temperature and pressure and caustic washing the resultant product. The caustic washed product is then subjected to two pass hydrogenation to provide a transformer oil having superior Doble oxidation resistance values.

Abstract: A transformer oil processing sequence is disclosed. The process comprises contacting a naphthenic based oil with an oxygen-containing gas in the presence of a free radical initiating catalyst under mild oxidation conditions of temperature and pressure, fractionally distilling the resultant product and then hydrogenating the oil.

Abstract: A refrigeration oil processing sequence is disclosed which produces a superior oil without the use of sulfuric acid treating and the resultant sludge problems. The process comprises contacting a naphthenic based oil with an oxygen-containing gas in the presence of a permanganate under mild oxidation conditions of temperature and pressure followed by adsorbent fractionation.

Abstract: A transformer oil processing sequence is disclosed which produces a superior oil without the use of large doses of sulfuric acid and the resultant sludge problems. The process comprises contacting a naphthenic based oil with an oxygen-containing gas in the presence of a catalytic amount of sulfuric acid under mild conditions of temperature and pressure and caustic washing the resultant product. The caustic washed product is then hydrogenated.

Abstract: Disclosed are lubricant compositions containing adducts of an amine with a phosphate ester of the formula: ##STR1## wherein R is hydrogen or alkyl having up to 25 carbon atoms in the chain, R' is hydrogen or alkyl having up to 7 carbon atoms except only one of R and R' can be hydrogen or octyl.

Abstract: The transformer oils of improved resistivity are prepared by adding an effective quantity of a carbonyl containing compound particularly an aldehyde or ketone to a conventional transformer oil.

Abstract: On-line sensors sense the kinematic viscosity, the infrared absorption, at a predetermined wavelength, and the sulfur content of crude oil and corresponding signals are provided to a computer circuit. The computer circuit solves the equation M%BP={C.sub.1 --C.sub.2 [1n(IRxC.sub.3)]--C.sub.4 S+C.sub.5 [1n(IRxC.sub.3)]S }1nKV, where M%BP is a particular percent boiling point property of crude oil, IR is the infrared absorption of the crude oil, S is the sulfur content of the crude oil, KV is the kinematic viscosity of the crude oil, and C.sub.1 through C.sub.5 are constants.

Abstract: On-line sensors sense the kinematic viscosity, the infrared absorption, at a predetermined wavelength, the ultraviolet absorption of a predetermined wavelength, and the sulfur content of crude oil and corresponding signals are provided to a computer circuit. The computer circuit solves the equation:M%BP={--C.sub.1 +C.sub.2 [ln(IRxC.sub.3)]+C.sub.4 [lnUV]--C.sub.5 S--C.sub.6 [ln(IRxC.sub.3)](lnUV)+C.sub.7 [ln(IRxC.sub.3)]S}lnKVwhere M%BP is a particular percent boiling point property of crude oil, IR is the infrared absorption of the crude oil, S is the sulfur content of the crude oil, KV is the kinematic viscosity of the crude oil, UV is the ultraviolet absorption of the crude oil and C.sub.1 through C.sub.7 are constants.

Abstract: The 50% boiling point, the gravity and the viscosity of waxy oil are sensed by sensors which provide corresponding signals. A computing circuit connected to the sensors provides a signal corresponding to the wax content of the waxy oil in accordance with the signals from the sensors and equations hereinafter disclosed.

Abstract: Disclosed are lubricant compositions containing adducts of an amine with a phosphate ester of the formula: ##EQU1## wherein R is hydrogen or alkyl having up to 25 carbon atoms in the chain, R' is hydrogen or alkyl having up to 7 carbon atoms except only one of R and R' can be hydrogen or octyl.

Abstract: A system measures and records the API gravity the viscosity and the sulfur content of waxy lubricating oil and provides corresponding signals. A computing circuit develops a signal corresponding to the wax content in accordance with the sensed parameter signals and an equation hereinafter disclosed. The wax content signal is recorded.