Mineral-oil base oil, lubricating oil composition, internal combustion engine, and lubricating method for internal combustion engine
a technology of lubricating oil and base oil, which is applied in the direction of additives, lubricant compositions, base materials, etc., can solve the problem that the temperature of engine oil cannot be easily increased, and achieve the effects of low-temperature viscosity characteristics, and low-temperature fuel consumption and low-temperature engine start-up performan
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production example 1 (
Production of Bottom Oil)
[0282]In a process of producing a typical feedstock oil, after naphtha and light kerosene were separated and removed by hydrocracking an oil containing a heavy fuel oil obtained by distilling a crude oil under reduced pressure by a vacuum distillation apparatus, the remaining bottom fraction was taken out. The bottom fraction was used as a “bottom oil” in the following production.
[0283]For the bottom oil, the content of the oil component=75 mass %, the content of the sulfur component=82 ppm by mass, the content of the nitrogen component=2 ppm by mass, the kinematic viscosity at 100° C.=4.1 mm2 / s, and the viscosity index=134.
production example 2 (
Production of Solvent Dewaxed Oil and Slack Wax)
[0284]The bottom oil obtained as described above was solvent dewaxed in a low temperature range of −35° C. to −30° C. using a mixed solvent of methyl ethyl ketone and toluene to separate a wax and obtain a “solvent dewaxed oil.” Then, the separated wax was referred to as a “slack wax.”
[0285]For the solvent dewaxed oil, the content of the oil component=100 mass %, the content of the sulfur component=70 ppm by mass, the content of the nitrogen component=2 ppm by mass, the kinematic viscosity at 100° C.=4.1 mm2 / s, and the viscosity index=121.
[0286]In addition, for the slack wax, the content of the oil component=15 mass %, the content of the sulfur component=12 ppm by mass, the content of the nitrogen component=less than 1 ppm by mass, the kinematic viscosity at 100° C.=4.2 mm2 / s, and the viscosity index=169.
example 1 (
Production of Mineral Base Oil (1))
[0287]The solvent dewaxed oil obtained in Preparation Example 2 was used as a feedstock oil (i).
[0288]The feedstock oil (i) was subjected to hydrogenation process under the conditions of a hydrogen partial pressure of 20 MPa, a reaction temperature of 280 to 320° C., and an LHSV of 1.0 hr−1 by using a nickel-tungsten-based catalyst.
[0289]The hydrogenated product oil was distilled under reduced pressure to recover a fraction having a kinematic viscosity within a range of 4.2 to 4.4 mm2 / s at 100° C., thereby obtaining a mineral base oil (1).
[0290]For the mineral base oil (1), the aromatic content (% CA)=0.0, the naphthene content (% CN)=26.5, the content of the sulfur component=less than 100 ppm by mass, and the weight average molecular weight=150 to 450.
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