FIELD: coal tar production. SUBSTANCE: thermolysis tar or composition prepared on its basis is subjected for short-term treatment with air with ozone addition. Treatment conditions: at 60-80 C, for 1 h, ozone content in ozone-air mixture is 0.8-8.0 vol.%. EFFECT: decreased toxicity and carcenogenicity of tar, retained technological properties. 1 tbl
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