Document Type and Number:
Japanese Patent JPS4836205
Kind Code:
A
Abstract:
Used non-aqueous metalworking lubricant, such as, cold rolling oil, is reconditioned by contacting it with sufficient strong base in the form of particulate or dissolved alkanol-soluble alkali metal hydroxyde and monohydric alkanol to reduce the total acid number of the oil to less than about 0.12 mg. KOH per gram of oil and preferably less than about 0.08 mg. KOH per gram of oil. At about 0.025 mg. KOH per gram of oil to zero total acid number the oil becomes a light golden color. On filtering or centrifuging the oil to remove precipitate formed during the strong base treatment, the oil is clarified and the ash content is reduced. If the oil already contains alkanol, only the strong base need be added as by suspending pellets of strong base in the oil in a cloth bag or wire screen enclosure or by circulating the coil through a charge of the particulate strong base. The reduced total acid number is maintained by steadily or periodically contacting the oil with strong base in the presence of monohydric alkanol.
Application Number:
JP8968072A
Publication Date:
May 28, 1973
Filing Date:
September 08, 1972
Export Citation:
International Classes:
C10M175/00; B21B45/02; C10G19/00; C10G19/073; C10G29/22; C10M175/04; C10N40/24; (IPC1-7): C10H11/00
Domestic Patent References:
| JPS4920725A | 1974-02-23 |