Abstract:

ZX-200 activated carbon powder was used to absorb the trace phosphorictungsto acid from polytetramethylene ether glycol（PTMEG），and the static adsorption characteristics were investigated. Phosphorictungsto acid showed the fastest diffusion velocity on activated carbon at 60℃. Results of adsorption kinetics and thermodynamics study showed that the adsorption is a spontaneously exothermic physical process，which fits well witha pseudo- second-order rate equation and Freundlich isotherm model. Under 60 ℃ and 6 g/h velocity，the concentration of phosphorictungsto acid in a 4452.0 g solution was reduced from 190.00 µg/g to 1.00 µg/g by 2 g of activated carbon powder in a fixed bed，which illustrated application values in the quality improvement of polytetramethylene ether glycol.