A study was made of the effect of the conditions of oxidation of microcrystalline wax and subsequent separation of the oxidate on the yield and quality of the products. It is shown that a change in the oxidation rate has no effect on the yield of a solid fraction with a penetration index of 11-12 (at 250 degree C) that can be extracted at minus 15 degree C. An increase in the separation temperature to 0 degree C or a change in the methylethylketone 1 toluene ratio from 70:30 to 30:70 at a separation temperature of minus 15 plus minus 15 degree C leads to a decrease in the yield of a solid oxidized product with a penetration index of 9 (at 25 degree C) from 65 to 50%.