FIELD: mineral oils. SUBSTANCE: worked out mineral oils, in particular, exhausted vacuum oil is regenerated by keeping heated oil in contact with 5-20 wt % of silica gel for 3-4 h followed by vacuum filtration carried out in three step: through metal gauze, nutsch filter, and nickel metal- ceramic filter. Silica gel is purified to meet sanitary code by way of calcining it at 350-450 C and subsequent carbonate opening with removing harmful impurities. EFFECT: improved quality of regenerated product. 2 cl
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