公开(公告)号：EP0679739B1

公开(公告)日：1998-08-05

申请号：EP95106176.1

申请日：1995-04-25

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Wha Seop Lee ,  Seong Mu Jo ,  Chong Soo Park ,  Yong Keun Hong

IPC: D01F13/02 ,  D01F2/00

CPC classification number: D01F13/02 ,  D01F2/00 ,  Y02P70/627

公开(公告)号：EP0679739A1

公开(公告)日：1995-11-02

申请号：EP95106176.1

申请日：1995-04-25

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Wha Seop Lee ,  Seong Mu Jo ,  Chong Soo Park ,  Yong Keun Hong

IPC: D01F13/02 ,  D01F2/00

CPC classification number: D01F13/02 ,  D01F2/00 ,  Y02P70/627

Abstract: There is disclosed a method for purifying a used aqueous N-methylmorpholine N-oxide solution reclaimed from a spinning aqueous solution, which results from a coagulation solution into which a cellulose dope containing N-methylmorpholine N-oxide is extruded through a spinning die and from a washing solution for the coagulated cellulosic articles in manufacture processes for cellulose fibers or films, comprising adding an oxidant to the used aqueous N-methylmorpholine N-oxide solution to remove impurities therefrom through oxidizing N-methylmorpholine to N-methylmorpholine N-oxide and break down of the chromophores of the impurities.
Utterly distinguished from conventional methods in the principle, the method is very simple and efficient as well as far superior to the conventional methods using ion exchange resin in the decoloration. In addition, it needs not suffer a loss of amine oxide as usual in the ion exchange resin. Further, the oxidant can achieve the decolorization without influence of the concentration of amine oxides. The amine oxide decolorized by the oxidant may be used to prepare the cellulose dope without any more purification. Provided that sequential use of the oxidant and the resin or active carbon, there are brought about much higher efficiency as well as much purer aqueous amine oxide solution.

Abstract translation: 公开了一种纯化从纺丝水溶液中回收的N-甲基吗啉N-氧化物水溶液的方法，该溶液是由含有N-甲基吗啉N-氧化物的纤维素掺杂物通过纺丝模头和 在纤维素纤维或薄膜的制造方法中用于凝固的纤维素制品的洗涤溶液，包括向所用的N-甲基吗啉N-氧化物水溶液中加入氧化剂以通过将N-甲基吗啉氧化成N-甲基吗啉N-氧化物从而除去杂质，并使断裂 下降的发色团的杂质。 在原理上与传统方法不同，该方法非常简单有效，远远优于使用离子交换树脂在脱色中的常规方法。 此外，离子交换树脂中不需要像往常一样损失氧化胺。 此外，氧化剂可以实现脱色而不影响氧化胺的浓度。 氧化剂脱色的氧化胺可用于制备纤维素原液，无需任何进一步的纯化。 只要顺序使用氧化剂和树脂或活性炭，就能产生更高的效率以及更纯净的氧化胺水溶液。