The tar carbonization was studied in the temperature range of 350-500 degrees C. Gaseous products formed during the tar carbonization at 450 degrees C were analyzed for the concentration of sulfur-containing compounds. H2S and COS were observed in the reaction products. An increase of the carbonization temperature from 450 to 550 degrees C led to the decrease of the coke yield due to deeper cracking of the tar components. The temperature increases also resulted in the decrease of the sulfur concentration in the coke from 1.28 % to 1.18 %. The efficiency of the carbonization process and the properties of the obtained coke were further improved by placing three different catalysts Ni-Mo/Sibunit, Cu/Sibunit and Ni/Sibunit in different zones of the autoclave where the tar carbonization was performed. In zone 1 the tar was subjected to hydrocracking and desulfurization over the 8%Ni-2,5%Mo/Sibunit catalyst. In zone 2 sulfur was trapped by the Cu/Sibunit catalyst in the form of copper sulfide. In zone 3 coke was formed over the Ni/Sibunit catalyst predominantly from gases formed by the tar cracking. Such organization of the carbonization process increased the coke yield to 45 wt.%. The three-zone catalyst arrangement during the tar carbonization also resulted in a substantial decrease of the sulfur concentration in gaseous products, which led to lower sulfur concentration in the solid reaction products in zone 3.