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    • 1. 发明授权
    • Method for forming cellulose
    • 纤维素成型方法
    • US06921820B2
    • 2005-07-26
    • US10247623
    • 2002-09-20
    • Kunio AraiTadafumi AjiriHideo HattoriMitsuru Sasaki
    • Kunio AraiTadafumi AjiriHideo HattoriMitsuru Sasaki
    • C08B15/02C08B15/08C08B13/00D21C1/00
    • C08B15/08Y02P20/544Y10T428/249921
    • A method for forming II-type cellulose, which comprises introducing together a slurry having water and a I-type cellulose dispersed therein and water in the state of high temperature and high pressure to a tubular reactor (28) contacting the I-type cellulose with a hot water in a supercritical state or subcritical state for a predetermined time in the tubular reactor (28), to thereby cleave a part of the hydrogen bonds in the I-type cellulose and dissolve the I-type cellulose into the water in a supercritical state or subcritical state, cooling a cellulose solution discharged from the tubular reactor (28) in a cooler (30) to room temperature or lower, followed by allowing to stand, to thereby precipitate crystals of II-type cellulose having a molecular weight lower than that of the I-type cellulose, and separating the resultant II-type cellulose from a solvent. The method allows the preparation of pure II-type cellulose by the use of a simple process.
    • 一种形成II型纤维素的方法,其包括将具有水分和I型纤维素分散在其中的高温高压状态的水引入与I型纤维素接触的管状反应器(28)和 在管状反应器(28)中处于超临界状态或亚临界状态的预定时间的热水,从而切割I型纤维素中的一部分氢键,并将I型纤维素溶解在超临界水中 状态或亚临界状态,将冷却器(30)中从管式反应器(28)排出的纤维素溶液冷却至室温以下,然后静置,使析出的分子量低于 I型纤维素,并将所得II型纤维素与溶剂分离。 该方法允许通过简单的方法制备纯的II型纤维素。