C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
362/39
C02F 1/42 (2006.01) B01J 41/04 (2006.01) D01F 13/02 (2006.01)
Patent
CA 2027513
ABSTRACT OF THE DISCLOSURE: There is disclosed a process for purifying aqueous solutions of N-methyl-morpholine N-oxide (NMMO), such as spinning bath solutions incurred in the production of cellulose products, in which process the solutions to be purified are contacted with an anion exchanger and the purified solutions are separated from the anion exchanger. The process is carried out in one step and the anion exchanger, as functional groups, exclusively contains quaternary tetraalkylammonium groups of the formulae Image or Image wherein X? represents the anion of an inorganic or organic acid. After this, the anion exchanger is regenerated with an aqueous acidic solution.
Astegger Stephan
Eichinger Dieter
Korger Dietmar
Manner Johann
Weinzierl Karin
Fetherstonhaugh & Co.
Lenzing Aktiengesellschaft
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