Treatment And Resources Reuse Of The Wastewater Of Phenol Extraction From Coal Tar

It is aimed to guide the treatment and resource reuse of wastewater of phenol extraction from coal tar by studying adsorption behavior, adsorption thermodynamics and adsorption kinetics of the three kinds of resin to phenol and m-crenol, macroporous resin of ND-99 resin made in our nation, SP-825 resin produced in United States, XAD-16 resin made in Japan, and results show that: at the same temperature, adsorption capacities rendering ND-99>SP-825>XAD-16 trend to be the same kind of adsorbate; Freundlich isotherm equation can be a very good explanation of adsorption behaviors of phenol and m-cresol on ND-99, SP-825 and XAD-16 resin at 298K, 308K, and 318K; in the study temperature range, the adsorption enthalpies are negative, indicating that adsorptions of phenol and m-cresol on three kinds of resin are exothermic reaction; the adsorption free energy changes are all negative, indicating that adsorptions of phenol and m-cresol on three kinds of resin are spontaneous, the adsorption free energy change of ND-99 resin is larger than SP-825 and XAD-16 resin; the entropy change of the resins are negative, because freedom degrees of molecular movement of adsorbates are limited from three-dimensional space in solution to two-dimensional surface of adsorbents, the lower degree of movement disorder will lead to entropy reduction; adsorption kinetics of phenol and m-cresol on ND-99, SP-825 and XAD-16 resin at 298K, 308K, and 318K conform to the first-level dynamic equation; time for reaching adsorption equilibrium rendering XAD-16