Abstract

The phase equilibria distribution of naphthalene between CO 2 , water, and poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) block copolymer micelle phases is examined experi mentally and predicted semiquantitatively using a molecular thermodynamic model. The predictions treat the poly(propylene oxide) micelle core as a «pseudophase» resembling an ether. The favorable distribution coefficients at pressures as low as 70 bar suggest that CO 2 is appropriate for regenerating block copolymer micelles used for concentration of trace organics in dilute aqueous solutions

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