摘要 |
<p>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.</p> |
申请人 |
LENZING AG, LENZING, AT |
发明人 |
ASTEGGER, STEFAN, DR., A-4840 VOECKLABRUCK, AT;FIRGO, HEINRICH, DR., A-4840 VOECKLABRUCK, AT;WOLSCHNER, BERND DR., A-4840 VOECKLABRUCK, AT;MAENNER, JOHANN, 4852 WEYREGG/ATTERSEE, AT;WEINZIERL, KARINDR., 4850 TIMELKAM, AT;ZINKELI, STEFAN ING., 4844 REGAU, AT;EICHINGER, DIETER DR., 4840 VOECKLABRUCK, AT |