Title:
METHOD FOR RECLAIMING USED LUBRICATING OIL
Document Type and Number:
Japanese Patent JP3131916
Kind Code:
B2
Abstract:
PURPOSE: To obtain a reclaimed oil having a low ash content by dispersing a specific phosphoric (phosphorous) acid compound in a used lubricating oil to contact them under sufficient reaction conditions, adding activated clay, etc., and filtering the dispersion.
CONSTITUTION: A phosphoric acid compound and/or a phosphorous acid compound both represented by the formula (wherein R1 and R2 may be the same or different and each is a 6-18C aryl or alkylaryl, and R3 is H or OH) is dissolved in a used lubricating oil in an amount of 0.8-6wt.%. The solution is heated at 60°C or higher, preferably 80-160°C, for 10min to 24hr to contact the acid compound with the sludge, soot, etc. The resulting precipitate is filtered off. At least one adsorbent selected from activated clay, diatomaceous earth, and active carbon is added to the resulting oil in an amount of 1-20wt.% based on the oil. The mixture is heated at 40-160°C for 10min to 24hr. The precipitated or suspended matter is removed with a suitable filter selected from, e.g. 50- to 400-mesh screens. It is desirable that the treated oil be hydrogenated. The ash content of the reclaimed oil is about 0.2% or lower.
Inventors:
Shinya Nakatani
Yoshihiro Matsudaira
Yumi Hazumi
Yoshihiro Matsudaira
Yumi Hazumi
Application Number:
JP36118192A
Publication Date:
February 05, 2001
Filing Date:
December 29, 1992
Export Citation:
Assignee:
Cosmo Research Institute Co., Ltd.
Cosmo Oil Co., Ltd.
Cosmo Oil Co., Ltd.
International Classes:
C10M175/02; C10N60/02; (IPC1-7): C10M175/02
Domestic Patent References:
| JP1275692A | ||||
| JP1271487A |
Attorney, Agent or Firm:
Kubota Chikashi (1 person outside)
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