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    • 3. 发明授权
    • Preparation of chlorinated phenoxyalkanoic acids
    • 氯化苯氧烷酸的制备
    • US4515985A
    • 1985-05-07
    • US331457
    • 1981-12-16
    • Gerd HussleinGerhard HamprechtKarl-Heinz KoenigWalter BoehmManfred Gaeng
    • Gerd HussleinGerhard HamprechtKarl-Heinz KoenigWalter BoehmManfred Gaeng
    • C07C59/68C07C51/00C07C51/363C07C51/367C07C67/00C07C59/56
    • C07C51/363C07C51/367
    • 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.degree. to 70.degree. 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.
    • 一种通过使苯氧基乙酸或2-甲基苯氧基乙酸反应制备2,4-二氯或2-甲基-4-氯苯氧基乙酸或α-2,4-二氯或α-甲基-4-氯苯氧基丙酸的方法或 α-苯氧基丙酸或α-2-甲基苯氧基丙酸与氯在水中的反应,其中苯氧基乙酸或苯氧基丙酸从其水溶液中沉淀出来,将氯气送入得到的苯氧基乙酸或2-甲基苯氧基乙酸或α-苯氧基丙酸或α- -2-甲基苯氧基丙酸在30至70℃的水中,其速率不超过其在悬浮液中消耗的速率,直到理论上所需量的氯气的100至110%被吸收 通过悬浮液,从悬浮液中分离出2,4-二氯或2-甲基-4-氯 - 苯氧基乙酸或α-2,4-二氯或α-甲基-4-氯 - 苯氧基丙酸 。