RECOVERY OF AMINES BY MEMBRANE TRANSPORT

摘要

The aminic substrates transported and separated by means of liquid membrane technique were aniline, N,N-dimethylaniline, cyclohexylamine, di-n-butylamine, morpholine, o- and p-toludine. Experiments showed that it is possible to discriminate between the aliphatic and aromatic amines of a given mixture. Selectivity is mainly the result of a well-chosen pH gradient. Results suggest that the macrocyclic ligand (18C6, DB18C6, or DCH18C6) associates with the substrate at the source phase-membrane interface, forming an aggregate of relatively low stability, that has a positive effect when transporting aniline, di-n-dibutylamine, and cyclohexylamine. Better transport yield were achieved changing the transport cell design.