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    JPS591255B2 -
    5.
    发明专利
    JPS591255B2 - 失效

    公开(公告)号：JPS591255B2

    公开(公告)日：1984-01-11

    申请号：JP4264176

    申请日：1976-04-16

    Applicant: Bayer Ag

    Inventor： HAINTSU URURITSUHI BURANKU ,  FURIIDORITSUHI DEYURUHORUTSU ,  GUIDO SUKIPUKA

    IPC: C07C205/05 ,  C07C67/00 ,  C07C201/00 ,  C07C201/16

    CPC classification number: C07C201/16 ,  C07C205/06

    Abstract: 1496996 Preparing 1,5- and 1,8-dinitronaphthalenes BAYER AG 14 April 1976 [19 April 1975] 15272/76 Heading C2C The invention comprises a process for isolating 1,5- and 1,8-dinitronaphthalenes from a mixture of dinitronaphthalenes which contains at least said 1,5- and 1,8-isomers in which the mixture is treated first with a more polar solvent for dinitronaphthalenes to dissolve all the isomers except the 1,5-dinitronaphthalene which is recovered, the solution of isomers is then treated, after removal of the solvent therefrom, at elevated temperature with a less polar aromatic solvent for dinitronaphthalenes so as to dissolve all materials other than 1,8-dinitronaphthalene which is thus recovered, the more polar solvent being employed in an amount of 1À2 to 20 times the weight of 1,8-isomer in the mixture and the less polar solvent in an amount of 1 to 20 times the weight of said 1,8-isomer.

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