Process for isolating an alkali metal 2,4-dichlorophenoxide and 2,4-dichlorophenol in a mixture of chlorophenols
The process for isolating an alkali metal 2,4-dichlorophenoxide and 2,4-dichlorophenol in a mixture of chlorophenols in an interaction of the mixture of chlorophenols and of an aqueous alkali solution in the presence of an aromatic hydrocarbon having a boiling temperature of 80-150 DEG C or of a mix...
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Zusammenfassung: | The process for isolating an alkali metal 2,4-dichlorophenoxide and 2,4-dichlorophenol in a mixture of chlorophenols in an interaction of the mixture of chlorophenols and of an aqueous alkali solution in the presence of an aromatic hydrocarbon having a boiling temperature of 80-150 DEG C or of a mixture of the latter and an aliphatic alcohol. The process is carried out at a ratio by weight between the mixture of chlorophenols and the aromatic hydrocarbon of 1:1-3 respectively or between the mixture of chlorophenols, aromatic hydrocarbon and aliphatic alcohol of 1:1-3:0.05-0.2 respectively until a mixture of alkali metal chlorophenoxides is formed, which mixture is subjected to azeotropic drying and which is then cooled with subsequent isolation of the alkali metal 2,4-dichlorophenoxide in the form of a precipitate, which is treated if necessary with an inorganic acid until 2,4-dichlorophenol has formed.
LE PROCEDE D'ISOLEMENT D'UN 2,4-DICHLOROPHENOLATE DE METAL ALCALIN ET DU 2,4-DICHLOROPHENOL DANS UN MELANGE DE CHLOROPHENOLS EN UNE INTERACTION DU MELANGE DE CHLOROPHENOLS ET D'UNE SOLUTION AQUEUSE D'ALCALI EN PRESENCE D'UN HYDROCARBURE AROMATIQUE AYANT UNE TEMPERATURE D'EBULLITION DE 80-150C OU D'UN MELANGE DE CELUI-CI ET D'UN ALCOOL ALIPHATIQUE.ON REALISE LE PROCESSUS A UN RAPPORT EN POIDS ENTRE LE MELANGE DE CHLOROPHENOLS ET L'HYDROCARBURE AROMATIQUE DE 1:1-3 RESPECTIVEMENT OU ENTRE LE MELANGE DE CHLOROPHENOLS, L'HYDROCARBURE AROMATIQUE ET L'ALCOOL ALIPHATIQUE DE 1:1-3:0,05-0,2 RESPECTIVEMENT JUSQU'A LA FORMATION D'UN MELANGE DE CHLOROPHENOLATES DE METAL ALCALIN, QU'ON SOUMET A UN SECHAGE AZEOTROPIQUE PUISQUE L'ON REFROIDIT AVEC ISOLEMENT SUBSEQUENT DU 2,4-DICHLOROPHENOLATE DE METAL ALCALIN SOUS FORME DE PRECIPITE, QU'ON TRAITE AU BESOIN PAR UN ACIDE MINERAL JUSQU'A FORMATION DU 2,4-DICHLOROPHENOL. |
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