To sterilize a large amt. of a cooling lubricant by bringing it into contact with a filter cake, as a filter medium, comprising a particulate crosslinked polyvinylpyrrolidone/iodine complex.
A contaminated cooling lubricant being supplied at a flow rate of 100-50,000 l/min is mixed under stirring with a suspension contg. 1-30 wt.% particulate crosslinked polyvinylpyrrolidone/iodine complex in an amt. of 0.5200 ml per l of the lubricant. After 1-300 sec, the lubricant is introduced into a filtration apparatus where the complex is deposited as a filter cake with a height of 0.1-100 mm on a filter support having a pore width of 10-100 μm. The lubricant is caused to pass through within a contact time of 10 sec and impurities are thus separated. The complex has an iodine content of 1-22 wt.%, a free iodine content of 0.2-6 ppm, an average particle size of 80-120 μm. and a specific surface area of 0. 8-6 m2/g and is used as a filter medium.
FUSSNEGGER BERNHARD
OECHSLE DIETMAR DR
FEIFEL KLAUS HELMUT DR
ZEILER MARTIN
SCHENK FILTERBAU GMBH
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