Forming solutions of cellulose in aqueous teritary amine oxide
    1.
    发明授权
    Forming solutions of cellulose in aqueous teritary amine oxide 失效
    纤维素在水性氧化胺水溶液中的形成溶液

    公开(公告)号:US5888288A

    公开(公告)日:1999-03-30

    申请号:US875437

    申请日:1997-11-10

    CPC分类号: D01D1/02 C08B1/003 D01F2/00

    摘要: A method is described for forming a solution of cellulose in a tertiary amine oxide (such as N-methylmorpholine N-oxide) and a non-solvent for cellulose (such as water). The method involves the preparation of a mixture containing excess non-solvent, and removing the excess by heating the mixture to a temperature in excess of the boiling point of the non-solvent at a predetermined sub-atmospheric pressure, and feeding the heated mixture into the introduction zone of a mixing chamber at the predetermined sub-atmospheric pressure, so as to cause flash evaporation of some of the excess non-solvent. The mixture in the mixing chamber is then agitated by a rotor and transported through the mixing chamber whilst further evaporation of the non-solvent occurs. The cellulose solution thus formed is extracted from the mixing chamber, and the evaporated non-solvent withdrawn in cocurrent mode from the same end of the mixing chamber. Apparatus for carrying out the method is also described.

    摘要翻译: PCT No.PCT / GB96 / 00029 Sec。 371 1997年12月23日第 102(e)日期1997年12月23日PCT 1996年1月9日PCT PCT。 出版物WO96 / 21678 日本1996年7月18日描述了在叔胺氧化物(如N-甲基吗啉N-氧化物)和纤维素(如水)的非溶剂中形成纤维素溶液的方法。 该方法包括制备含有过量非溶剂的混合物,并通过在预定的低于大气压的压力下将混合物加热至超过非溶剂沸点的温度,并将加热的混合物加入 在预定的低于大气压的混合室的引入区,以使一些过量的非溶剂闪蒸。 然后将混合室中的混合物用转子搅拌并通过混合室运送,同时发生非溶剂的进一步蒸发。 由此形成的纤维素溶液从混合室中抽出,蒸发的非溶剂从混合室的同一端以并流模式排出。 还描述了用于执行该方法的装置。