화학공학소재연구정보센터
Separation Science and Technology, Vol.42, No.1, 153-170, 2007
Adsorptive separation and recovery of chlorinated phenols
Adsorption as a process for the removal and recovery of chlorinated phenols (dichlorophenols, trichlorophenol, and 2,4-dichlorophenoxyaxceticacid) from aqueous solutions has been studied. Equilibrium adsorption studies of these compounds were carried out individually using three different commercially available polymeric resins; Amberlite XAD-4, Amberlite XAD-7, and INDION 1014 MN-2 (IMN-2) having a different surface area and polarity to compare their equilibrium loading capacities. As IMN-2 gave the highest capacity, it was used for further investigation involving column breakthrough studies. A combined approach of solubility and steric hindrance is used to compare the adsorption capacity of isomers. The effect of presence of salts (NaCl and Na2SO4) on the adsorption capacity of 2,3-DCP and 2,4-DCP (only on IMN-2) was also studied. A Langmuir adsorption isotherm was found to correlate the equilibrium data. Column studies were also carried out to investigate the breakthrough behavior at a flow rate of 0.16 bed volume/min. LUB values were calculated to find out the column efficiency. 15-30 bed volumes of methanol accomplished the regeneration of the loaded bed.