Water → 2,4,5-Trichlorophenol
Reaction equation
[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[C:5]([Cl:9])=[CH:4][C:3]=1[N+]#N.[OH2:12]>>[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[C:5]([Cl:9])=[CH:4][C:3]=1[OH:12]Participants
3
Procedure
In the fourth stage, the 2,4,5-trichlorobenzenediazonium strong mineral acid salt in solution in water is hydrolytically decomposed at a temperature from the reflux temperature to a temperature of 375° C. At the lower temperatures, the solution is refluxed in the presence of a cupric salt, the 2,4,5-trichlorophenol formed is steam distilled from the reaction and separately recovered. At higher temperatures of 130° C. to 375° C., preferably from 140° C. to 220° C., the aqueous solution is injected into a column packed with a suitable inert material and maintained at the desired temperature, either with or without additional super-heated steam. The 2,4,5-trichlorophenol steam distills from the top of the heated column and the concentrated aqueous strong mineral acid is recovered from the bottom of the column.
Workup
- customis hydrolytically decomposed at a temperature from the reflux temperature to a temperature of 375° C