FIELD: wood industry. SUBSTANCE: an industrial aqueous solution resulting from treatment of cellulose is passed through a cationite containing carboxyl ionic groups, N-methylmorpholine oxide is eluted from the cationite with an aqueous solution of an organic acid having a pKa value higher than 3.0 and a boiling point lower than 120 C. The desired product is recovered by from the resulting eluate by distillation in the form of a concentrated aqueous solution. EFFECT: more efficient recovery process.
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