The adsorption of heterocyclic amines, such as morpholine, pyridine, picolines, quinoline, and isoquinoline from dilute aqueous streams, with or without electrolytes and a t different pH, on activated carbons and polymeric adsorbent (XAD-4, Rohm and Haas), was successfully accomplished using fixed bed systems. A mathematical model, based on external mass transfer and pore diffusion, is used for forecasting theoretical breakthrough profiles, which have been compared with experimental results and "by-best fit" comparison effective pore diffusion coefficient, has been found out for each adsorbate-adsorbent system. The loaded adsorbents were regenerated with an organic solvent (e.g., methanol) efficiently. The amines can be recovered by distillation from the eluted solution.

2015Morpholine was extracted from dilute aqueous waste streams by two-phase reaction of morpholine and benzoyl chloride, dissolved in toluene. Solvent extraction with organic acids such as lauric acid and poly(acrylic acid) was also considered for the recovery of morpholine from dilute aqueous streams. The recovery of morpholine can be combined with the making of a saleable compound. Poly(acry1ic) acid worked well a t the 1000 ppm level, and it was possible to bring down the morpholine content from 1000 t o 3 ppm. P r a d i p K. Pahari, M a n M o h a n S h a r m a *

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