C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/514.7
C07C 59/70 (2006.01) C07C 51/363 (2006.01) C07C 51/367 (2006.01)
Patent
CA 1182473
Abstract of the Disclosure: A process for the prepara- tion of 2,4-dichloro- or 2-methyl-4-chlorophenoxyacetic acid or .alpha.-2,4-dichloro- or .alpha.-2-methy1-4-chlorophenoxypro- pionic acid by reacting phenoxyacetic or 2-methylphenoxy- acetic acid or .alpha.-phenoxypropionic or .alpha.-2-methylphenoxy- propionic acid with chlorine in water, wherein phenoxy- acetic acid or phenoxypropionic acid is precipitated from an aqueous solution thereof, chlorine gas is passed into the resulting suspension of phenoxy- acetic or 2-methylphenoxyacetic acid or .alpha.-phenoxypro- pionic or .alpha.-2-methylphenoxypropionic acid in water at from 30 to 70°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.
391845
Boehm Walter
Gaeng Manfred
Hamprecht Gerhard
Husslein Gerd
Koenig Karl-Heinz
Basf Aktiengesellschaft
Robic Robic & Associes/associates
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