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    PROCESS FOR THE PRODUCTION OF A NANOCELLULOSE MATERIAL
    2.
    发明公开
    PROCESS FOR THE PRODUCTION OF A NANOCELLULOSE MATERIAL 审中-公开

    公开(公告)号：EP3409691A1

    公开(公告)日：2018-12-05

    申请号：EP17173805.7

    申请日：2017-05-31

    申请人： SAPPI Biochemtech B.V.

    发明人： ENGLISH, Robert ,  HEATON, John

    IPC分类号： C08B1/00 ,  C08B15/02 ,  D21C9/00 ,  D21H11/18

    CPC分类号： D21H11/18 ,  C08B1/00 ,  C08B15/02 ,  D21C9/002 ,  D21C9/004 ,  D21C9/005 ,  D21C9/007

    摘要： A process for the production of a non-derivatized nanocellulose material from a cellulosic fibrous material, comprising the steps of providing a suspension of cellulosic fibrous material in a continuous phase of a non-aqueous process liquid comprising a swelling agent and a processing solvent; allowing the cellulosic fibrous material to swell such as to form a suspension of swollen cellulosic fibrous material in a continuous phase of non-aqueous process liquid; optionally refining said suspension of swollen cellulosic fibrous material in a continuous phase of non-aqueous process liquid to increase the fineness of the swollen cellulosic fibrous material; removing the swelling agent from the rocess liquid such as to form a suspension of cellulosic fibrous material in a continuous phase of processing solvent; subjecting the swollen and optionally refined cellulosic fibrous material to high-shear comminution such as to release of the non-derivatized nanocellulose material from the swollen and optionally refined cellulosic fibrous material and such as to form a dispersion of non-derivatized nanocellulose material in a continuous phase of a processing solvent; contacting the dispersion of non-derivatized nanocellulose material in a continuous phase of a processing solvent with a supercritical fluid such as to remove the processing solvent and isolate the non-derivatized nanocellulose material, wherein the supercritical fluid is preferably supercritical carbon dioxide or ammonia; characterized in that the swelling agent is a low-transition-temperature mixture (LTTM) and in particular a deep eutectic solvent and said low-transition-temperature mixture and in particular said deep eutectic solvent is soluble in the processing solvent and wherein the processing solvent is non-solubilizing for the cellulosic fibrous material and the non-derivatized nanocellulose material.