The reverse osmosis separations of two piperidinooxy radicals from aqueous solutions were studied at operating pressures of 1724 to 6895 kPag. Both radicals are stable during the reverse osmosis experiment and positively separated by using cellulose acetate membranes. The liquid chromatography data indicates that piperidinooxy radicals are weakly adsorbed to cellulose acetate polymer, while their electrolyte analogues are rejected, and undissociated piperidine solute (also a structural analogue of the radicals) is strongly adsorbed.
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Chan et al. (1983) studied this question.
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