公开(公告)号：HU188736B

公开(公告)日：1986-05-28

申请号：HU398781

申请日：1981-12-29

Applicant: BASF AG

Inventor： HUSSLEIN GERD ,  HAMPRECHT GERHARD ,  KOENIG KARL-HEINZ ,  BOEHM WALTER ,  GENG 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.