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The direct emission without useful processing of the exhaust gas produced from coal chemical industry would pollute the surrounding environment in large extent, especially do bad effect to the social. Therefore the way of gas purification is necessary to be adopted to adsorb or remove the hazardous ingredients in the emission gas. Such as the activated carbon, is an effective product to remove the H2S in the exhaust gas, after the H2S is removed in the desulfurization tower filled with activated carbon desulfurizer, and the qualified treatment through other purification systems then is discharged into the high altitude.