Kinetic Research On Adsorption Of VOCs By Activated Semi-coke

Volatile Organic Compounds (VOCs) is another kind of contamination like particle. They do great harm to environment, growth of animals and vegetation and human health. The main sources of VOCs are exhaust gas emited by chemical factories, organic solvents discharged by industries like paper making, mining, metal plating and spinning and so on. Hence, how to prevent and eliminate the pollution of VOCs becomes an attracting project in the field of chemical engineering and environmental reservation.At present, activated carbon (fibre) adsorption is widely applied in VOCs treatment in China. But the disadvantages of this technology are low adsorption capacity, high cost and causing second pollution. Semi-coke can be a good substitute as an adsorbent to eliminate VOCs because it is cheap and also has developed microspore structures. Semi-coke has been used in SO₂ and NOx removal in the flue gas since the mid-80s.In this paper, experiments were taken to investigate the kinetic adsorption of typical multicomponent VOCs (toluene, ethyl acetate and benzene) on sorbent which was made by semi-coke.The research results show that single component adsorption equilibrium is good fit with Langmuir equation. For multicomponent adsorption, because of competition and interferene of components, the high adsorption capacity displaces the adsorbed components (Toluene displaces ethyl acetate and benzene, and ethyl acetate displaces benzene), and thus the breakthrough curves of components changed. In this paper, E-L equation and IAST were used to predict and analyze the capacity of multicomponent adsorption and compare the theoretical results with the data of the experiments. The total capacity calculated by E-L equation or IAST is good fit with the conclusions of experiments. But the capacity of single component adsorption calculated by E-L equation has about 20% deviation. As a compare, the deviation of IAST is lower, about 10%. Among the results of toluene, ethyl acetate and benzene calculated by E-L equation or IAST, ethyl acetate has the least error.