| 摘要 |
Disclosed herein is a process for the removal of an oil in an aqueous liquid wherein after cleaning a workpiece having oil thereon with an aqueous solution of a detergent, the oil contained in the aqueous solution is removed from the aqueous solution. The oil-containing aqueous solution is heated to a predetermined temperature, at which the detergent component does not evaporate, to unite droplets of the oil with each other, thereby making the size of the oil droplets greater, and the oil droplets which have grown greater in size are then separated and removed from the aqueous solution. According to this process, an oil emulsified in the aqueous detergent solution can be separated and removed from the aqueous solution with ease to keep the detergency of the detergent over a long period of time.
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