N-Methylmorpholine-N-oxide ring cleavage registration by ESR under heating conditions of the Lyocell process.

A Konkin, F Wendler, F Meister, H-K Roth, A Aganov, O Ambacher

Index: Spectrochim. Acta. A. Mol. Biomol. Spectrosc. 69(3) , 1053-5, (2008)

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Abstract

Thermal cleavage processes of N-methylmorpholine-N-oxide monohydrate (NMMO) were observed in pure NMMO as well as in cellulose/NMMO solutions by ESR at temperatures of the industrial Lyocell process ( approximately 370K). Generated radicals were attributed to the alkylnitroxyl type radicals -CH(2)-NO-CH(3) in NMMO and additional (and dominated) -CH(2)-NO-CH(2)- in cellulose/NMMO solutions. Formation of both radical types formed due to NMMO ring scission is suggested.