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    Continuous purification of adiponitrile
    2.
    发明授权
    Continuous purification of adiponitrile 失效
    连续纯化ADIPONITRILE

    公开(公告)号：US3839408A

    公开(公告)日：1974-10-01

    申请号：US29263472

    申请日：1972-09-27

    Applicant: BASF AG

    Inventor： AREND W ,  EISFELD K ,  HAUG P ,  WEGERICH A ,  HIMMELHAN E ,  SCHOLZ H

    IPC: C07C255/04 ,  C07C20060101 ,  C07C67/00 ,  C07C253/00 ,  C07C253/34 ,  C07C121/26

    CPC classification number: C07C255/00

    Abstract: 1. A PROCESS FOR THE CONTINUOUS PURIFICATION OF ADIPONITRILE BY CONTINUOUSLY PASSING THE ADIPONITRILE TO BE PURIFIED THROUGH A CRYSTALLIZING ZONE WITH COOLING THEREOF SO THAT A SUSPENSION OF FINELY DIVIDED SOLID ADIPONITRILE IN MOLTEN ADIPONITRILE IS FORMED SEPARATING THE SOLID ADIPONITRILE FROM THE MOLTEN ADIPONITRILE, WASHING THE SOLID DINTRILE WITH LIQUID ADIPONITRILE AND RECOVERING PURE ADIPONITRILE CRYSTALS, AND RETURNING THE SEPARATED ADIPONITRILE MOTHER LIQUID TO THE CRYSTALLIZING ZONE WHEREIN THE COOLING OF THE ADIPONITRILE TO BE PURIFIED IS CARRIED OUT INDIRECTLY BY EVAPORATING LIQUID AMMONIA WHICH IS PASSED THROUGH A COOLING JACKET OF SAID CRYSTALLIZATION ZONE, THE AMOUNT BY WEIGHT OF LIQUID AMMONIA PASSED THROUGH THE COOLING JACKET PER UNIT TIME BEING ONE TO FIVE TIMES THE AMOUNT OF AMMMONIA, AS HEAT OF EVAPORATION THEREOF, NECESSARY TO ABABSORB THE HEAT EVOLVED BY THE CRYSTALLIZATION OF ADIPONITRILE IN SAID ZONE, AND THE MOTHER LIQUOR OBTAINED AFTER SEPARATION OF THE SOLID DINITRILE OBTAINED IS SEPARATED INTO TWO UNEQUAL PORTIONS OF 55-90% AND 1045% BY WEIGHT OF THE TOTAL MOTHER LIQUOR OF WHICH THE LARGER PORTION IS RETURNED IMMEDIATELY TO THE CRYSTALLIZATION ZONE AND THE SMALLLER PORTION IS DISTILLED BEFORE IT IS RETURNED TO THE CRYSTALLIZATION ZONE.

    5.
    发明专利
    未知

    公开(公告)号：DK27382A

    公开(公告)日：1982-07-25

    申请号：DK27382

    申请日：1982-01-22

    Applicant: BASF AG

    Inventor： SCHOLZ H

    IPC: C07D263/44 ,  C07D

    6.
    发明专利
    未知

    公开(公告)号：SE304261B

    公开(公告)日：1968-09-23

    申请号：SE992664

    申请日：1964-08-17

    Applicant: BASF AG

    Inventor： EISFELD K ,  WEGERICH A ,  HAUG P ,  SCHOLZ H

    IPC: C07C255/04 ,  B01D9/02 ,  C07C20060101 ,  C07C67/00 ,  C07C253/00 ,  C07C121/26

    Abstract: Adiponitrile is purified by cooling the liquid or heating the solid so as to produce a suspension of adiponitrile crystals in liquid adiponitrile at a temperature of below 2.0 DEG C., separating the crystals, e.g. on a filter press, vacuum filter, pressure filter or in a centrifuge, washing the crystals, e.g. with pure liquid adiponitrile or with water or an organic liquid, and returning the separated liquid adiponitrile, with or without the wash liquid, to the first or another crystallization zone. The wash liquid may be pure adiponitrile obtained by partly melting the separated solid adiponitrile, e.g. while still in the separation apparatus.

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