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    STABILIZED HYDROXYLAMINE SOLUTIONS
    92.
    发明专利
    STABILIZED HYDROXYLAMINE SOLUTIONS 未知

    公开(公告)号：CA2239805A1

    公开(公告)日：1997-06-26

    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 containing 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 have 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 CH2 CH2-!-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, CH2COOH, 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 Nhydroxyethylenediamino-triacetic acid and the salts thereof.

    MANUFACTURE OF SODIUM DITHIONITE
    96.
    发明专利
    MANUFACTURE OF SODIUM DITHIONITE 未知

    公开(公告)号：CA1119379A

    公开(公告)日：1982-03-09

    申请号：CA300102

    申请日：1978-03-30

    Applicant: BASF AG

    Inventor： OSTERTAG WERNER ,  WUNSCH GERD ,  KIENER VOLKER ,  HETZEL ECKHARD ,  SCHREINER SIEGFRIED ,  LEUTNER BERND ,  SCHLIMPER HANS-ULRICH ,  VOELKL ERFRIED

    IPC: C01B17/66 ,  C07C51/00 ,  C07C53/06 ,  C07C67/00

    Abstract: In a process for the manufacture of sodium dithionite by reacting sulfur dioxide with sodium formate and aqueous sodium hydroxide solution in the presence of methanol, an aqueous methanolic solution of sodium formate is first produced by reacting carbon monoxide with sodium hydroxide solution in an aqueous medium, containing from 1 to 50% by weight of methanol, based on the amount of water, at from 80 to 120.degree.C under a pressure of from 10 to 40 bars. The resulting aqueous methanolic solution can be reacted directly, in the conventional manner, with sulfur dioxide and aqueous sodium hydroxide solution to give sodium dithionite. The process has the advantage that in the first step the reaction gives, within a short period and at a relatively low temperature, aqueous methanolic solutions of sodium formate, which in the second step can be directly converted to sodium dithionite.

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