Mineral oils: processes and products – Refining – Purifying used oil
Patent
1980-03-04
1982-06-22
Gantz, Delbert E.
Mineral oils: processes and products
Refining
Purifying used oil
208181, 208188, C10M 1100, C10G 3304
Patent
active
043361293
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a method for treating a water-containing waste oil, and more particularly to a method for treating a water-containing waste oil comprising oil, water and sludge contents and forming a water-in-oil emulsion, by admixing therewith a certain specific solvent.
BACKGROUND ART
At a coal tar plant, coal tar distillation gives distillates such as carbolic oil, naphthalene oil, wash oil and anthracene oil. When subjected to phenols(or acid)-extraction or base-extraction treatment or when used for recovery of light oil from coke over gas, such distillates are in contact with water and thereby yield a water-containing waste oil. Further, coal tar contains water in itself, and therefore, a waste oil likewise forms during its storage in a tank or at the time of its distillation. Furthermore, similar waste oils result from the washing of the tanks for various distillate oils.
Oil originated from coal tar have greater hydrophilic property than oils originated from petroleum, and accordingly they tend to form a water-in-oil emulsion. Depending on their origins, water-containing waste oils differ more or less from each other in their characteristics. However, they normally contain not only oil and water but also solid substance, i.e. sludge, and they form an extremely stable emulsion comprising these three components.
Water-containing waste oils collected from coal tar plants have a relatively uniform composition and they normally contain 10 to 40% by weight of oil, 1 to 5% by weight of sludge and the rest being water. The sludge contains inorganic substances mainly comprising iron compounds, resinous matters comprising aromatic condensed ring compounds, coke powder, coal powder, etc., and is swelled in a water-containing waste oil about ten times of the volume of its dried state. The oil fraction contains mainly benzene homologues as light distillates, naphthalenes as medium distillates and tricyclic aromatic compounds such as anthracenes as heavy distillates. The specific gravity of the oil fraction is relatively close to that of water and it varies depending upon the composition of the particular oil. The specific gravity becomes smaller than water as the proportion of light distillates increases or as the temperature rises.
Further, various petroleum-based water-containing waste oils are known such as rolling oil wastes, lubricating oil wastes, or wash oil wastes which result from the rolling or tube making operations at ironworks, or from the washing of a coke oven gas with a petroleum-type absorption oil, or from machine tool works; crude oil wastes, heavy oil wastes, residual oils from tanks, sludge oils resulting from washing of crude oil tanks or heavy oil tanks, or the production line of lubricating oils at petroleum refineries and petrochemical factories; lubricating oil wastes, automobile engine oil wastes, cutting oil wastes, anti-corrosive oil wastes from automobile industries, machine making factories and ship yards. Depending upon their origins, these petroleum-based water-containing waste oils differ more or less in their characteristics. However, they normally contain not only oil and water but also sludge as solid constituent, and they also contain additives such as emulsifiers. Thus, they form an extremely stable emulsion. For instance, waste oils derived from the rolling operation at a metal working plant, or from the washing operation of coke oven gas or from the machine tool works, are in a form of a water-in-oil emulsion (hereinafter referred to as W/O emulsion) comprising mixed oil which contains as principal constituent a petroleum-based oil such as a rolling oil, lubricating oil, machine oil or wash oil, water and fine solid particles such as iron oxides or carbon particles. Likewise, waste oils or sludge oils derived from the washing operation of the crude oil or heavy oil tanks at a petroleum refinery, or waste oils derived from the machine making factories or the like, are water-containing waste oils in a form of W/O emulsion.
These water-containin
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Okazaki Hiroshi
Soeda Mahito
Yoshimura Tokuo
Yushima Takeharu
Chaudhuri Olik
Gantz Delbert E.
Hueschen Gordon W.
Nippon Steel Chemical Co. Ltd.
Shinnikka Environmental Engineering Co., Ltd.
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