Systems and methods for varnish abatement and removal from in-service fluids and components of an industrial lubricated system. The systems and methods may include adding an effective amount of a solubility enhancer to the in-service fluid, and contacting the mixture with a medium having acrylamide or styrenic functionality to remove contaminants from the mixture. Systems may include a medium circuit having a medium pump and a medium component and a solubility enhancer reservoir arranged to dispense solubility enhancer to the reservoir. Methods may include pre-conditioning the in-service fluid before adding solubility enhancer.

A process for the enhancement of the byproducts of a process for the regeneration of exhaust oils is described, wherein said process for the regeneration of exhaust oils which includes at least one of the following steps: a) passing of the oil to be regenerated into one or more centrifuges, b) storage of the oil, before treatment, in suitable containers, c) desiloxanation and d) filtering. The byproducts of one or more of steps a) to d) are treated, gathered and mixed with one another and added to the bitumen coming out as tail of a fractioned distillation step of the above-said regeneration process of exhaust oils. A plant for the carrying out of a process according to any one of the preceding claims is also described, comprising a processing unit for each of the byproducts coming from steps a) to d) and a mixer (6) with stirring (7).

A method for hydrotreating and recycling waste lubricating oil, the method comprising the two steps of slurry bed pre-hydrotreatment and deep hydrotreatment, specifically as follows: mechanical impurities are removed from waste lubricating oil, and then the oil is subjected to flash distillation to separate free water and a portion of light hydrocarbons; a bottom product of the flash distillation column is mixed with hydrogen and a self-sulfurizing oil-soluble transition metal catalyst, and then enters a slurry bed reactor for pre-hydrotreatment; a liquid product obtained by performing separation on a reaction effluent is subjected to hydrocyclone separation and solvent washing to remove solid residue, and then a pre-treated lubricating oil component is obtained; said component is mixed with hydrogen and then enters a hydrofining reactor, an isomerization-dewaxing reactor, and a supplementary refining reactor, connected in series, for hydrotreatment; and the reaction products are separated to obtain high-quality naphtha, diesel oil and a lubricating base oil. The method of the present invention has such advantages as simple processing procedures, a high oil liquid yield, good lubricating oil base oil quality, and can implement full-fraction resource utilization of waste lubricating oil. In addition, the oil-soluble catalyst features simple dispersion, no need for vulcanization, a small catalyst adding amount, high low-temperature hydrogenation activity, is capable of effectively preventing the coking that could occur during a process of preheating the waste lubricating oil, and ensures long-term stable operation of the device.

A processing method includes processing a metal wire rod using an emulsion lubricant that includes an oil and a nonionic surfactant at an oil-to-nonionic surfactant ratio of 1:0.3 to 0.9 (in mass ratio). The method may include purifying the emulsion lubricant after being used for processing the metal wire rod while maintaining the oil-to-nonionic surfactant ratio of 1:0.3 to 0.9 (in mass ratio) and then reusing the purified emulsion lubricant to process the metal wire rod.

The invention relates to an integrated plant for regeneration and recovering waste industrial and engine oils, such as marine oils (MOBILGARD M430 for the main propulsion engines, Devlac MX15W40 for the diesel generators, M-14G2CS for lubricating the stern tube, BARTRAN HV 68 for the blade control system of variable pitch propellers, CASTROL T 68 for lubricating the gas turbine of the main propulsion engine, OMALA 220 for lubricating the gear components), motor vehicle oils, oils for textile machinery, etc., comprising several units, and can also be used across various industries. The technical result of the invention is the improved degree of purification of waste industrial and engine oils and safe operation of the plant. An integrated plant for regeneration and recovering waste industrial and engine oils comprises a module for removing moisture and fuel fractions from the oil to be purified, which module is connected to a module for diagnostics and monitoring of the oil to be purified, a module for controlling the quality of the oil to be purified and a module for applying functional additives to the oil to be purified.

A liquid composition for use in purifying an oil contains a polar polymer, a surface active hydrotrope/solubilizer, and a co-tenside. The polar polymer may be a polyalkylene glycol, such as polyethylene glycol. The hydrotrope/solubilizer may be an anionic sulfonic acid, a phosphate ester-based substance or a non-ionic surfactant from the poly-glycoside family. The co-tenside may be at least one amphoteric co-surfactant, such as sodium caprylimino dipropionate.

A lubricating oil purification system for purifying a stock solution mixed with ammonia water into lubricating oil, the lubricating oil purification system includes: an engine; a lubricating oil purifier configured to separate a stock solution containing the lubricating oil used in the engine into a light liquid which is at least the purified lubricating oil and a heavy liquid containing ammonia; and a water supply unit configured to supply water into a separation chamber during operation of the lubricating oil purifier.

According to an embodiment, a method for producing a recycled lubricating base oil from waste lubricating oil is proposed, the method including a) first pretreating the waste lubricating oil, b) performing distillation to recover a fraction having a specific boiling point from the first pretreated waste lubricating oil, c) second pretreating the fraction recovered in the distillation operation, and d) hydroprocessing the second pretreated fraction in the presence of a catalyst. The recycled lubricating base oil produced by the above method has a viscosity index (VI) equal to or greater than 130. The proposed method makes it possible to produce a high-grade lubricating base oil using only waste lubricating oil as a feed, thereby reducing the cost of raw materials for production of lubricating base oil, and having the advantage of being environmentally friendly.

A method of recycling waste lubricant. The method includes providing a waste lubricant-derived oil fraction, pretreating the waste lubricant-derived oil fraction, and hydrocracking the pretreated waste lubricant-derived oil fraction. The method has economic advantages in that waste lubricant can be recycled into fuel oil and high-grade lube base oil with a relatively high yield compared to a lube base oil manufacturing process utilizing only unconverted oil as a feedstock.

Provided is a method for recycling a cold-rolled oil sludge, including the following steps: mixing methanol with the cold-rolled oil sludge to obtain a mixture, and subjecting the mixture to esterification under supercritical conditions to obtain a solid-liquid mixture; subjecting the solid-liquid mixture to solid-liquid separation to obtain an iron filing and a liquid phase; and subjecting the liquid phase to methanol removal and extraction in sequence to obtain an oil phase product and an aqueous phase product.