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    METHOD FOR PRODUCING AN AQUEOUS SOLUTION OF FREE HYDROXYLAMINE
    2.
    发明专利
    METHOD FOR PRODUCING AN AQUEOUS SOLUTION OF FREE HYDROXYLAMINE 未知

    公开(公告)号：CA2299475C

    公开(公告)日：2008-12-02

    申请号：CA2299475

    申请日：1998-08-04

    Applicant: BASF AG

    Inventor： SCHNEIDER HANS-MICHAEL ,  STROFER ECKHARD ,  SCHELLING HEINER ,  WATZENBERGER OTTO ,  MAUER PETER

    IPC: C01B21/14

    Abstract: The invention relates to a method for producing an aqueous solution of free hydroxy-lamine 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.

    STABILIZED HYDROXYLAMINE SOLUTIONS
    3.
    发明专利
    STABILIZED HYDROXYLAMINE SOLUTIONS 未知

    公开(公告)号：CA2239805C

    公开(公告)日：2006-12-19

    申请号：CA2239805

    申请日：1996-12-20

    Applicant: BASF AG

    Inventor： LEUTNER BERND ,  SCHNEIDER HANS-MICHAEL

    IPC: C01B21/14 ,  C07C20060101 ,  C07C215/00 ,  C07D521/00

    Abstract: The present invention relates to stabilised hydroxylamine solutions containi ng as stabilizer at least one compound of general formula (I) R1R2N -A-NR3R4 or salts thereof. In said formula (I): A stands for alkylene, alkenylene, alkinylene, cycloalkylene, cycloalkenylene, arylene, o-, m- or p-xylylene, or a five- or six-member saturated or unsaturated heterocycle with a nitrogen atom, the groups in question can hav e 1, 2 or 3 substituents selected independently of one another from among alkyl, alkoxy or hydroxyl, or stands for the group -X-[-NR-B-]-n- wherein B and X stand for -CH2CH2- or - CH2CH2CH2-, n stands for a number between 10 and 50,000, R stands for H, alkyl, an ethylene or propylene group substituted with OH, NH2, NHCOR5 or COOH, CSSH, CH2CN or CH2PO3H2 or represents a bridge with a nitrogen atom of another polyethyleneimine or polypropyleneimine chain, said bridge being formed by - [- NR-B-]-o- or CH2 CHOH CH2-[-O CH2CH2-]-p-CH2 CHOH CH2-, o and p independently of one another standing for 1-15, R5 stands for H, C1-C18 alkyl or CHR6COR6, R6 standing for a C12-C18 alkyl group, R1, R2, R3, R4 independently of one another stand for H, CH2COO H, CH2PO3H2, alkyl, acyl, CH2CH2OH, CH2CH2NH2 or (a) in which R7 stands for OH, SH, NH2, CN, COOH, alkyl or alkoxy. Excepted from the disclosure are ethylenediamino-tetraacetic acid and N-hydroxyethylenediamino-triacetic acid and the salts thereof.

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