COORDINATION SORPTION OF AMINES ON SULPHONIC RESIN IN Cu~(2+) FORM FROM NONAQUEOUS SYSTEM

Some of the natural products are water unsolvable.For such products,it's better that the sorption should be carried out in nonaqueous system.But common sorption resins are not effective in nonaqueous system,the simple reason for which is that the sorption on common resins is mainly based on the hydrophobic interaction between the resins and the adsorbate.So it is practically important to exploit resins which fit the nonaqueous system and study their sorption behavior.In this paper,a serious of coordination sorption resins have been prepared by loading different transition metal ions on the macroporous sulphonic resin,and the sorption of aniline, N -methyl aniline and N,N- dimethyl aniline on sulphonic resin in Cu 2+ form from ethanol,ethyl acetate and hexane has been studied and compared with that from water.The sulphonic resin in Cu 2+ form has the highest sorption capacity from hexane,and has lower sorption capacities from ethanol,ethyl acetate and water sequentially.In all the media,the resin shows the highest sorption affinity for aniline,moderate for N -methylaniline and the lowest for N,N- dimethylaniline.The different sorption affinities for the three anilines are attributed to the different steric hindrance of different anilines coordinating to Cu 2+ on the resin.The sorptive isotherms of the anilines from different media fit the Freundlich equation,and the sorption enthalpies have been calculated.The sorption enthalpies of aniline from water and ethanol are higher, but nearly zero from ethyl acetate and hexane.The difference of sorption enthalpies from different media is attributed to the coordination of water to Cu 2+ on the resin and the different swelling ratio in various media.The sorption rate of the anilines from water is the highest and decreases from ethanol,ethyl acetate and hexane sequentially.The different sorption rates are also attributed to the different swelling ratio in different media.All these conclusions will be useful for applying the coordination resin to the sorptive separation of some water unsolvable natural products.