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    PURIFICATION METHOD AND SYSTEM OF N-METHYLMORPHOLINE N-OXIDE, AND N-METHYLMORPHOLINE N-OXIDE OBTAINED THEREOF
    1.
    发明公开
    PURIFICATION METHOD AND SYSTEM OF N-METHYLMORPHOLINE N-OXIDE, AND N-METHYLMORPHOLINE N-OXIDE OBTAINED THEREOF 审中-公开

    公开(公告)号：US20240317694A1

    公开(公告)日：2024-09-26

    申请号：US18575187

    申请日：2022-06-23

    申请人： B-FCTL CO., LTD.

    发明人： Wanli LU ,  Jie MA

    IPC分类号： C07D295/24 ,  D01F13/02

    CPC分类号： C07D295/24 ,  D01F13/02

    摘要： The invention discloses a purification method and system of N-methylmorpholine N-oxide (NMMO), and a N-methylmorpholine N-oxide obtained thereof. The invention is used for recovering and purifying NMMO in a lyocell fiber coagulation bath. The method comprises: performing flocculation, microfiltration, ultrafiltration and nanofiltration membrane separation process to the lyocell fiber coagulation bath to remove macromolecular impurities such as suspending substance, heavy metal ions, heavy metal complexes, polysaccharides, etc., and then performing cooling crystallization between −20° C. and 78° C. to obtain NMMO hydrate crystals. The NMMO hydrate crystals obtained by the method provided in the invention do not contain PG, PG oxidation products, cellulose breakdown products, and NMMO decomposition products, which are present in the coagulation bath. The NMMO hydrate crystals are added with water to prepare a NMMO aqueous solution with a concentration of 19.8%, and the electrical conductivity is about 14.8 μs/cm.

    PURIFICATION METHOD, SYSTEM AND DETECTION METHOD OF N-METHYLMORPHOLINE N-OXIDE, AND N-METHYLMORPHOLINE N-OXIDE OBTAINED THEREOF
    2.
    发明公开
    PURIFICATION METHOD, SYSTEM AND DETECTION METHOD OF N-METHYLMORPHOLINE N-OXIDE, AND N-METHYLMORPHOLINE N-OXIDE OBTAINED THEREOF 审中-公开

    公开(公告)号：US20240279192A1

    公开(公告)日：2024-08-22

    申请号：US18560771

    申请日：2022-04-24

    申请人： B-FCTL CO., LTD.

    发明人： Wanli LU ,  Jie MA

    IPC分类号： C07D295/24 ,  B01D9/00 ,  D01F2/08 ,  D01F13/00

    CPC分类号： C07D295/24 ,  B01D9/0004 ,  B01D9/0031 ,  B01D9/0036 ,  D01F2/08 ,  D01F13/00 ,  B01D2009/0086

    摘要： The invention discloses a purification method, system and a detection method of N-methylmorpholine N-oxide (NMMO), and a N-methylmorpholine N-oxide obtained thereof. The NMMO is derived from a NMMO crude product prepared by the reaction of N-methylmorpholine with hydrogen peroxide. The mass concentration of NMMO in the NMMO crude product is 50% to 60%. The purification method includes: performing cooling crystallization to the NMMO crude product between −20° C. and 78° C. to obtain crystalline NMMO. The NMMO purification method has a low cost, a high purity of the obtained NMMO product, and almost no generation of exhaust gas, waste water, and solid waste. Different from current NMMO purification process, the purification method of the invention does not require ion-exchange resin, thus completely solved problems of significant amount of wastewater with high concentration of salt and COD and spent ion-exchange resin caused by the regeneration of ion-exchange resin.