| abstract |
To purify aqueous solutions of N-methylmorpholine N-oxide, in particular spinning bath solutions, the invention provides that the solutions are brought into contact with adsorbents and then subjected to filtration. The adsorbent employed is preferably alumina, silica or carbon. The adsorbents preferably have a particle size < 0.15 mm. The presence of adsorbents facilitates the filtration of the substances causing turbidity and, in addition to decolorisation, effects the removal of metal salts. |