EP3404084B1 - Procédé de lavage pour des huiles de rouleau et de dressage - Google Patents

Procédé de lavage pour des huiles de rouleau et de dressage Download PDF

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Publication number
EP3404084B1
EP3404084B1 EP18171973.3A EP18171973A EP3404084B1 EP 3404084 B1 EP3404084 B1 EP 3404084B1 EP 18171973 A EP18171973 A EP 18171973A EP 3404084 B1 EP3404084 B1 EP 3404084B1
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EP
European Patent Office
Prior art keywords
oil
rolling
phase
aluminum
aqueous
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EP18171973.3A
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German (de)
English (en)
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EP3404084C0 (fr
EP3404084A1 (fr
Inventor
Olaf Güssgen
Thomas Graf
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Speira GmbH
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Speira GmbH
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M175/00—Working-up used lubricants to recover useful products ; Cleaning
    • C10M175/005—Working-up used lubricants to recover useful products ; Cleaning using extraction processes; apparatus therefor
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M175/00—Working-up used lubricants to recover useful products ; Cleaning
    • C10M175/02—Working-up used lubricants to recover useful products ; Cleaning mineral-oil based
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/104—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/105—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three carbon atoms only
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/02—Groups 1 or 11
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C10N2040/244—Metal working of specific metals
    • C10N2040/245—Soft metals, e.g. aluminum

Definitions

  • the invention relates to a method for reprocessing oil contaminated with aluminum from rolling/skin-passing processes.
  • Rolling oils and skin-pass oils are cooling lubricants that have a major impact on the cost-effectiveness of production and the quality of the products.
  • the coefficient of friction between the work roll and the rolling stock should be neither too high nor too low.
  • a low coefficient of friction improves lubrication in the roll gap, so that energy consumption, frictional heat and roll wear are reduced.
  • the texture of the skin-pass roll is transferred to the surface of the strip to be rolled and a skin-pass oil is applied beforehand, which leads to a reduction in the forming forces acting in the roll gap of the skin-pass mill stand.
  • the forming forces effective in the roll gap are to be set as precisely as possible in order to maintain the low degrees of forming required during skin-passing just as precisely.
  • both the surfaces of the rolled strips and the surfaces of the work rolls used for their forming are protected.
  • the rolling oils are heavily contaminated by metal abrasion.
  • the impurities are essentially metal abrasion and metal soaps from the rolling stock, for example aluminum and magnesium, as well as metal abrasion from the rollers (e.g. iron and chrome).
  • Comparatively small amounts of rolling oil are used in temper rolling, but these are heavily contaminated with metal abrasion after a short time.
  • the proportion of aluminum in the rolling oil can then be up to 2% by weight and more, based on the mass of the oil.
  • the condition of the rolling oil must be continuously checked during rolling or skin-passing so that the limit concentrations of aluminum for the respective rolling process are not exceeded.
  • high amounts of aluminum in the rolling oil during rolling lead to product quality problems.
  • High levels of metal abrasion in the rolling oil lead to damage to the rolls and the formation of visually conspicuous surface contamination on the rolling stock, such as indentations, dark streaks and holes.
  • the DE 15 45 299 A1 proposes coagulating waste materials from waste oil from motor vehicle engines and transmissions by mixing it with an aqueous alkali metal hydroxide solution with a concentration of 10 to 50% by weight in a proportion of 2 to 15% by weight, based on the mass of the used oil and separating the clarified oil from the coagulation liquid and the suspension of aging products and then processing it using petroleum industry processes, for example refining.
  • the particle sizes are so small and the particle size distribution of the abraded metal is so unfavorable that satisfactory separation from the oil by filtration can hardly be achieved.
  • the U.S. 2,902,439 describes a process for the purification of lubricants from aluminum processing.
  • the lubricant is mixed with an aqueous cleaning solution.
  • This essentially contains sodium aluminate and at least an equal amount by weight of sodium hydroxide. Mixing with the lubricant occurs at a temperature of 120°F (48.9°C) to 210°F (98.9°C).
  • This document also states that only 20 ml of the cleaning solution is sufficient to clean one liter of dirty oil.
  • the U.S. 2,902,439 makes it clear that the treatment of aluminum fines in oil with caustic soda is dangerous because highly explosive hydrogen gas is evolved. Large amounts of caustic soda also produce foam, which is said to be difficult to control.
  • the invention is therefore based on the object of providing a process for the purification and reuse of used rolling oil or skin-pass oil that avoids the aforementioned disadvantages.
  • This problem is solved by a process for recycling oil contaminated with aluminum from rolling or skin-passing processes, in which rolling oil or skin-passing oil contaminated with aluminum is mixed with an aqueous alkali metal hydroxide solution, a phase separation is brought about between the aqueous phase and the oil phase, and then the aqueous phase is the oil phase is separated and the oil phase is freed from residual water and any suspended matter present using a drying agent, the mass ratio of contaminated oil to aqueous alkali metal hydroxide solution being 1 to at least 2.
  • the process according to the invention enables the cleaned oil to be reused as rolling or skin-pass oil.
  • the product oil of the process according to the invention is of high quality. Impurities from thermal treatment of the oil are not present at the time of recycling.
  • the method according to the invention makes it possible to save a great deal of oil in industrial rolling and skin-passing plants.
  • contaminated oils from rolling/skin-passing processes can be cleaned in a discontinuous process without waste-generating filtration and/or thermal separation processes such as distillation or rectification and used again as pure oil.
  • Wastewater that is easy to treat is produced in comparatively small quantities.
  • the aluminum hydroxide obtained can be used in water treatment. Critical waste is avoided.
  • the ecological footprint is significantly lower than in conventional cleaning processes. The same applies to the investment and operating costs.
  • Rolling oils and skin-pass oils within the meaning of the invention are oils and oil-containing liquids intended for rolling and skin-passing.
  • oil for the purposes of the invention includes fatty alcohols, fatty acids, fatty acid esters and kerosene cuts, mineral oils, vegetable oils and synthetic oils and mixtures thereof.
  • the hydrocarbon chains of these compounds can have, for example, 8 to 20, preferably 10 to 18, carbon atoms.
  • the end of the boiling point of the organic chemical compounds mentioned above should be below the lowest annealing temperature of around 320 °C that is customary in the aluminum industry.
  • the kinematic viscosity of the rolling and skin-passing oils at 40° C. is usually below 10 mm 2 /s, preferably below 6 mm 2 /s.
  • Rolling oils and skin-pass oils can also contain standard rolling additives.
  • the oils to be purified as starting material in the process according to the invention have previously been used in skin-passing and rolling of aluminum foils and wires. Compared to when they were first used, these oils are heavily contaminated by metallic abrasion.
  • the impurities contained therein are, for example, aluminum abrasion and other metal abrasion.
  • the proportion of aluminum particles in the contaminated oil can be, for example, 500 to 4000 mg/l. High concentrations of metal abrasion can occur in rolling processes, especially in the Production of very thin strips that greatly affect product quality.
  • the degree of contamination of the oil with metal debris can be determined visually during the rolling or skin-passing process and can also be determined gravimetrically by determining the turbidity or by testing with particle counters and particle size analyzers.
  • the contaminated oil described above is mixed with a dilute aqueous alkali metal hydroxide solution with stirring.
  • the amount of washing liquid is determined by the degree of contamination of the oil with aluminum particles.
  • the mass of the aqueous alkali metal hydroxide solution used is generally at least twice the mass of the contaminated oil.
  • the contaminated oil is introduced into the aqueous alkali metal hydroxide solution.
  • Alkali metal hydroxide solution within the meaning of the invention means a solution of alkaline earth metal hydroxide and/or alkali metal hydroxide.
  • particularly suitable alkali metal hydroxides are sodium hydroxide and potassium hydroxide.
  • the concentration of the alkali metal hydroxide in the aqueous solution is preferably high enough to completely solubilize the aluminum present in the oil.
  • the amount of alkali metal hydroxide that is preferably introduced is such that there is an excess of alkali metal hydroxide compared to the aluminum particles and other metal particles present in the oil.
  • the alkali metal hydroxide solution can contain alkali metal in a concentration of preferably 1 to 9% by weight, particularly preferably 2 to 7% by weight, based on the mass of the solution.
  • the alkali metal hydroxide solution can, for example, have a concentration of 2 to 5% by weight alkali metal hydroxide, based on the mass of the alkali metal hydroxide solution.
  • the volumetric fraction of the aqueous alkali metal hydroxide solution may preferably be greater than 40% v/v based on the volume of rolling oil and aqueous alkali metal hydroxide solution.
  • the aqueous alkali metal hydroxide solution and the contaminated oil are thoroughly mixed.
  • the intensive mixing of the aqueous alkali metal hydroxide solution with the oil washes out the aluminum from the oil phase.
  • Aluminum is thereby converted to aluminum hydroxide and further to aluminate, which are soluble in the alkaline aqueous phase.
  • soaps can also form.
  • the aluminate also remains in solution in the alkaline aqueous phase. Any other metals present also go into solution as hydroxides.
  • a water-soluble polyalkylene glycol can be added to improve the phase separation at the phase interface between the aqueous and oily phases.
  • a polyalkylene glycol is used that is completely soluble in water at 20 °C in any mixing ratio without phase separation.
  • the addition of a polyalkylene glycol for phase separation is particularly useful when the rolling oil contains additives such as acids. These acids can be fatty acids containing from 12 to 16 carbon atoms.
  • the polyalkylene glycol is preferably one of viscosity class 140.
  • the kinematic viscosity of the polyalkylene glycol can be 140 mm 2 /s to 160 mm 2 /s, preferably around 150 mm 2 /s.
  • the kinematic viscosity was determined using a rotational viscometer according to ASTM D-7042.
  • the polyalkylene glycol contains ethylene and propylene units. It can be used in an amount of 1 to 10% by weight, preferably 3 to 6% by weight, based on the mass of alkali metal hydroxide solution and polyalkylene glycol. Surprisingly, it has been shown that water-soluble polyalkylene glycol improves the processing of oils that are present together with acidic additives.
  • the mixing of contaminated oil and aqueous alkali metal hydroxide solution can preferably be carried out in a reactor equipped with a stirrer at room temperature (about 20 °C). There is no heating of the resulting mixture of contaminated oil and aqueous alkali metal hydroxide solution to a temperature of 45 °C or more.
  • the process according to the invention can be carried out at a temperature of 15° C. to 30° C. or even higher. Preferably the process temperature is from 15°C to 25°C.
  • the reactor may preferably be a bottom-conical reactor.
  • Conventional stirrers can be used as the stirrer.
  • an axial stirrer (propeller stirrer) is particularly suitable for enabling intensive mixing of aluminum-containing oil phase and aqueous alkali metal hydroxide phase in the reactor.
  • a tangential stirrer (anchor stirrer) is also conceivable.
  • the reactor is vented. The purpose of venting the reactor is to avoid an increase in hydrogen gas concentration during aluminum scrubbing.
  • the oil is preferably mixed with the aqueous alkali metal hydroxide solution until the oil phase is free of metallic aluminum. However, it is not essential that the oil phase is completely free of metallic aluminum. Intensive mixing of the two phases can take, for example, 30 to 120 minutes, depending on the size of the reactor and the intensity of stirring. A visual inspection is sufficient for this. Before cleaning, the oil is dark and not transparent, after cleaning it is clear and transparent. After cleaning, the oil has a water-clear to yellowish color.
  • the liquid is then left in the reactor until phase separation into an aqueous phase and an oil phase has taken place. Depending on the volume of liquid, this may take 30 to 120 minutes.
  • the aqueous phase with higher density settles in the lower part of the reactor.
  • the lower density, de-aluminum oil floats on top of the aqueous phase.
  • the extent of phase separation or the progress of separation of the two phases can be monitored during the separation process by measuring the electrical Conductivity of the liquid in the reactor or visually.
  • the aqueous phase is separated off. This is done, for example, by allowing the aqueous phase containing aluminate/aluminum hydroxide, which may contain other metal hydroxides, to flow off from the lower part of the reactor.
  • water or an aqueous liquid can be supplied in order to allow the cleaned rolling oil to flow off by the rise in the liquid level in the upper part of the reactor.
  • the oil phase is washed once or twice more with deionized water. During washing, too, the oil is intensively mixed with the water used for washing. A phase separation of the oil phase and the washing water phase is then allowed in turn. Thereafter, the washing water is separated off as before, the aqueous alkaline aluminate-containing phase.
  • the duration of the mixing of the oil and washing water and the duration of the phase separation can be selected in exactly the same way as when washing with and separating off metal hydroxide solution.
  • the purified oil is removed from the reactor.
  • the oil will usually be saturated or nearly saturated with water after the aluminum has been washed away.
  • the proportion of water in the oil can be around 100 ppm.
  • the oil is fed through a filter device.
  • This filter device serves to dry the oil. It also serves to remove any suspended matter still present in the oil.
  • the filter device can contain one or more substances for chemically or physically binding water. Such substances or desiccants include, for example, silica gels, molecular sieves, sodium sulfate, and magnesium sulfate. Sodium sulfate is particularly preferred.
  • the filter device can be designed as a so-called candle filter be filled with the substance for chemically or physically binding water (desiccant). By drying the oil, both water and suspended matter, if any are still present in the oil, are separated from the oil. The oil obtained is essentially anhydrous. This means that the water saturation in the oil is between 20 and 70% of the highest possible water saturation, preferably around 50% or less.
  • the water saturation in the oil can be determined with a capacitive water sensor or by titration according to Karl Fischer.
  • the product oil of the process according to the invention is almost free of metal abrasion. Oil cleanliness can be determined by measuring turbidity.
  • the oil obtained in this way can be reused as pure oil in skin-passing or rolling processes.
  • the aqueous phase containing dissolved aluminum can be neutralized.
  • the neutralization can take place, for example, by adding sulfuric acid.
  • Aluminum hydroxide and, if appropriate, other metal hydroxides are precipitated in the process. During the precipitation of aluminum hydroxide, suspended matter and the remaining oil are trapped, precipitated and separated from the water. After separation of water and solid phase, the water obtained in this way can often be discharged into the sewage system without further treatment, but in accordance with the requirements for direct dischargers.
  • the aluminum can also be washed out of the oil in two reactors connected in parallel in so-called pendulum batch operation, or different process stages of the process according to the invention can be carried out in parallel in both reactors.
  • the process of the invention can be carried out at ambient temperature. No supply of energy in the form of heat is required.
  • the process can be carried out batchwise or continuously.
  • the skin-passing of aluminum sheet in a skin-pass rolling stand 1 takes place with the addition of a skin-pass oil as a cooling lubricant (8 to 10 l/min).
  • a skin-pass oil as a cooling lubricant (8 to 10 l/min).
  • the skin-pass oil is conveyed from a pure oil tank 1 to the skin-pass mill stand 1 .
  • the used skin-passing oil enriched with aluminum is transferred via the line 3 into the accumulation tank 4 for contaminated skin-passing oil.
  • the contaminated oil is fed into the reactor 7 through line 5 .
  • Reactor 7 is equipped with a propeller stirrer 8 and a pressure aerator 9.
  • the enrichment of hydrogen gas in the reactor 7 is to be avoided by the pressurized aerator 9 .
  • dilute alkali metal hydroxide solution is introduced into reactor 7 in about a 10-fold stoichiometric excess, based on aluminum, as 2 to 3% sodium hydroxide solution before contaminated oil is fed into the reactor via line 5 to wash out the aluminum particles.
  • the dilute alkali metal hydroxide solution can also be fed into the reactor 7 via the lines 5 and 6 .
  • Alkali metal hydroxide can be stored in a storage tank 10 as a more concentrated solution.
  • liquid alkali metal hydroxide solution is transferred from storage tank 10 via line 11 into a mixer and brought to the desired concentration there by adding water from source 14 via line 13 .
  • the used rolling oil contaminated with aluminum is intensively mixed with the alkali metal hydroxide solution using the propeller stirrer 8.
  • the metal aluminum is to be largely converted into aluminum hydroxide.
  • a phase separation of the aqueous alkaline phase and the oil phase is then brought about in the reactor 7 .
  • the extent of phase separation is determined by measuring the electrical conductivity. If the phase separation in the reactor is largely complete, the aqueous alkaline phase is drained off at the bottom of the reactor and conducted via line 19 for further treatment 20 such as neutralization.
  • the oil phase is then drained from the reactor 7 and fed to a candle filter 16 via line 15 .
  • the oil is dried in the candle filter 16 . Furthermore, suspended matter is retained in the filter material as it flows through the filter 16 .
  • the oil flowing out of the filter is fed to the clean oil tank 1 via line 17 directed. From there it can be fed back to skin-pass mill 2 for use in a skin-pass process.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Claims (6)

  1. Procédé permettant le retraitement d'huiles contaminées par l'abrasion d'aluminium provenant de processus de laminage/skin-pass, caractérisé en ce que l'huile de laminage ou de skin-pass contaminée par de l'aluminium est mélangée à une solution aqueuse d'hydroxyde de métal alcalin, une séparation entre la phase aqueuse et la phase huileuse est provoquée, puis la phase aqueuse est séparée de la phase huileuse et la phase huileuse est débarrassée de l'eau résiduelle et, éventuellement, des matières en suspension présentes à l'aide d'un agent dessicatif, le rapport massique de l'huile de laminage ou de skin-pass contaminée à la solution aqueuse d'hydroxyde de métal alcalin étant de 1 à au moins 2.
  2. Procédé selon la revendication 1, caractérisé en ce qu'une huile de laminage ou de skin-pass comportant une teneur en aluminium métallique de 0,01 à 5 g/L est utilisée comme huile contaminée.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la solution aqueuse d'hydroxyde de métal alcalin est une solution aqueuse d'hydroxyde de sodium ou une solution aqueuse d'hydroxyde de potassium.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que le traitement de l'huile de laminage ou de skin-pass contaminée par de l'aluminium avec une solution aqueuse d'hydroxyde de métal alcalin est effectué en présence d'un polyalkylène glycol hydrosoluble, l'alkylène étant de l'éthylène et/ou du propylène.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que la séparation de la phase aqueuse et de la phase d'huile de laminage est facilitée par l'ajout d'un polyalkylène glycol totalement soluble dans tout rapport de mélange avec de l'eau à 20 °C sans séparation de phases.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que le mélange de l'huile de laminage ou de skin-pass contaminée par de l'aluminium est effectué dans un réacteur équipé d'un agitateur à température ambiante, et la séparation de la phase aqueuse de la phase huileuse est réalisée de manière à permettre à la phase d'huile de laminage purifiée de s'écouler hors de la partie supérieure du réacteur en alimentant la partie inférieure du réacteur en eau ou en liquide aqueux.
EP18171973.3A 2017-05-17 2018-05-14 Procédé de lavage pour des huiles de rouleau et de dressage Active EP3404084B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17171441.3A EP3404083A1 (fr) 2017-05-17 2017-05-17 Procédé de lavage pour des huiles de rouleau et de dressage

Publications (3)

Publication Number Publication Date
EP3404084A1 EP3404084A1 (fr) 2018-11-21
EP3404084B1 true EP3404084B1 (fr) 2023-08-09
EP3404084C0 EP3404084C0 (fr) 2023-08-09

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EP17171441.3A Withdrawn EP3404083A1 (fr) 2017-05-17 2017-05-17 Procédé de lavage pour des huiles de rouleau et de dressage
EP18171973.3A Active EP3404084B1 (fr) 2017-05-17 2018-05-14 Procédé de lavage pour des huiles de rouleau et de dressage

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EP17171441.3A Withdrawn EP3404083A1 (fr) 2017-05-17 2017-05-17 Procédé de lavage pour des huiles de rouleau et de dressage

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JP (1) JP6762988B2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114522992B (zh) * 2022-03-08 2024-01-02 金龙电缆科技有限公司 一种铝拉丝润滑液循环利用的方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2902439A (en) * 1958-07-03 1959-09-01 Aluminum Co Of America Reclamation of aluminum fabricating lubricants
DE1545299A1 (de) 1965-11-15 1969-06-26 Focsaneanu Dr Ing Otto A Verfahren zur Entfernung wesensfremder und wesenseigener Alterungsprodukte aus legierten und unlegierten Altoelen,wie Motoren- und Getriebeablassoelen,bzw. stark verschmutzter Kohlenwasserstoff-Loesemittel
CH595435A5 (fr) 1975-04-10 1978-02-15 Alusuisse
US4256578A (en) * 1979-11-29 1981-03-17 Amsted Industries Incorporated Waste oil recovery process
GB201506238D0 (en) * 2015-04-13 2015-05-27 3D Eco Oil Ltd A Lubricant

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EP3404084C0 (fr) 2023-08-09
EP3404083A1 (fr) 2018-11-21
JP2019022906A (ja) 2019-02-14
EP3404084A1 (fr) 2018-11-21
JP6762988B2 (ja) 2020-09-30

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