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    AN IMPROVED PROCESS FOR PREPARATION OF CHLORINATED PHENOXYALKANOIC ACIDS
    22.
    发明专利
    AN IMPROVED PROCESS FOR PREPARATION OF CHLORINATED PHENOXYALKANOIC ACIDS 未知

    公开(公告)号：IN155195B

    公开(公告)日：1985-01-12

    申请号：IN1392CA1981

    申请日：1981-12-07

    Applicant: BASF AG

    Inventor： HUSSLEIN GERD ,  HAMPRECHT GERHARD ,  KOENIG KARL-HEINZ ,  BOEHM WALTER ,  GAENG MANFRED

    IPC: C07C59/68 ,  C07C51/00 ,  C07C51/363 ,  C07C51/367 ,  C07C59/70 ,  C07C67/00 ,  C07C53/00

    Abstract: A process for the preparation of 2,4-dichloro- or 2-methyl-4-chlorophenoxyacetic acid or alpha -2,4-dichloro- or alpha -2-methyl-4-chlorophenoxypropionic acid by reacting phenoxyacetic or 2-methylphenoxyacetic acid or alpha -phenoxypropionic or alpha -2-methylphenoxypropionic acid with chlorine in water, wherein phenoxyacetic acid or phenoxypropionic acid is precipitated from an aqueous solution thereof, chlorine gas is passed into the resulting suspension of phenoxyacetic or 2-methylphenoxyacetic acid or alpha -phenoxypropionic or alpha -2-methylphenoxypropionic acid in water at from 30 DEG to 70 DEG C. at a rate not exceeding the rate at which it is consumed in the suspension, until from 100 to 110% of the theoretically required amount of chlorine gas has been taken up by the suspension, and the 2,4-dichloro- or 2-methyl-4-chloro-phenoxyacetic acid or alpha -2,4-dichloro- or alpha -2-methyl-4-chloro-phenoxypropionic acid is isolated from the suspension.

    CHLORINATED PHENOXYALKANOIC ACIDS
    23.
    发明专利
    CHLORINATED PHENOXYALKANOIC ACIDS 未知

    公开(公告)号：AU539818B2

    公开(公告)日：1984-10-18

    申请号：AU7906681

    申请日：1981-12-30

    Applicant: BASF AG

    Inventor： HUSSLEIN GERD ,  HAMPRECHT GERHARD ,  KOENIG KARL-HEINZ ,  BOEHM WALTER ,  GAENG MANFRED

    IPC: C07C59/68 ,  C07C51/00 ,  C07C51/363 ,  C07C51/367 ,  C07C59/70 ,  C07C67/00

    Abstract: A process for the preparation of 2,4-dichloro- or 2-methyl-4-chlorophenoxyacetic acid or alpha -2,4-dichloro- or alpha -2-methyl-4-chlorophenoxypropionic acid by reacting phenoxyacetic or 2-methylphenoxyacetic acid or alpha -phenoxypropionic or alpha -2-methylphenoxypropionic acid with chlorine in water, wherein phenoxyacetic acid or phenoxypropionic acid is precipitated from an aqueous solution thereof, chlorine gas is passed into the resulting suspension of phenoxyacetic or 2-methylphenoxyacetic acid or alpha -phenoxypropionic or alpha -2-methylphenoxypropionic acid in water at from 30 DEG to 70 DEG C. at a rate not exceeding the rate at which it is consumed in the suspension, until from 100 to 110% of the theoretically required amount of chlorine gas has been taken up by the suspension, and the 2,4-dichloro- or 2-methyl-4-chloro-phenoxyacetic acid or alpha -2,4-dichloro- or alpha -2-methyl-4-chloro-phenoxypropionic acid is isolated from the suspension.

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