3.
    发明专利
    未知

    公开(公告)号:DE19733681A1

    公开(公告)日:1999-02-11

    申请号:DE19733681

    申请日:1997-08-04

    Applicant: BASF AG

    Abstract: The invention relates to a method for producing an aqueous solution of free hydroxylamine by treating a hydroxylammonium salt with ammonia in the counter-current in a stripping column. As a result, hydroxylamine is released and at the same time, the solution obtained is separated into an aqueous hydroxylamine solution and a salt fraction by distillation. The inventive method is simple and mild, and can be carried out on a large scale. The risk of decomposition is minimal due to the low thermal burden, the low concentration of hydroxylamine and the short residence time involved in the process.

    4.
    发明专利
    未知

    公开(公告)号:DE19725851A1

    公开(公告)日:1998-12-24

    申请号:DE19725851

    申请日:1997-06-18

    Applicant: BASF AG

    Abstract: The invention relates to a method for the production of highly pure aqueous solution from free hydroxylamine, wherein the diluted aqueous hydroxylamine solution is concentrated in a column, the vapor containing hydroxylamine is removed from the bottom of the column via a side-stream and highly pure hydroxylamine is obtained through condensation of the vapors. The inventive method is simple and mild, can be used in large-scale production and yields "electronic grade" hydroxylamine.

    8.
    发明专利
    未知

    公开(公告)号:DE19545095A1

    公开(公告)日:1997-06-05

    申请号:DE19545095

    申请日:1995-12-04

    Applicant: BASF AG

    Abstract: The invention relates to a process for the preparation of styrene by dehydrogenating a mixture of ethyl benzol and at least one xylol isomer in the gas phase in the presence of a regeneratable, oxygen-carrying, metallic-oxide catalyst (redox catalyst), with a reducible active ingredient preferably consisting of at least one metallic oxide from the group of oxides of the elements Bi, Ce, Co, Cr, Cu, Fe, In, Mn, Mo, Nb, Ni, Sb, Sn, Pb and V, the xylol being at least partially oxidised.

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