AN ANALYTICAL DTA STUDY OF SOME BINARY PHENOL SYSTEMS

A comprehensive DTA study of some 40 different binary phenol systems i nvolving the 'in situ' formation of the p-nitrobenzoylchloride, p-phen ylazobenzoylchloride or 3,5-dinitrobenzoylchloride derivatives, has re vealed that for most of these systems, well-resolved endotherms appear in the DTA profiles corresponding to the melting points of the consti tuent phenols and of the respective derivatives. Thus this procedure i s of sufficient versatility for the identification of phenols in a bin ary mixture. The general method involves adding the chosen acid chlori de to the solid-state binary phenol mixture and obtaining the correspo nding DTA profile, which is subsequently compared with those in a bank for phenols, binary phenol mixtures and binary phenol derivative mixt ures. The method offers rapid identification of phenols in the solid s tate.