Water → Sulfanilic acid

Participants

Reaction Conditions

Reaction Steps

651.7 g (7.0 mol) of aniline in 1400 ml of o-dichlorobenzene were introduced into a 4 enamel stirring autoclave and 686.7 g (7.0 mol) of 100% sulphuric acid were added with stirring. The autoclave was then closed and the reaction mixture was heated to 200° C. with stirring. After 21/2 hours reaction time, the reaction mixture was cooled, poured into 1000 ml of water with stirring and neutralized with sodium hydroxide solution. Two liquid phases were obtained. After replenishing the aniline to the abovementioned value, the organic phase was added to a further batch. Pure p-sulphanilic acid was obtained from the aqueous phase by acidification using sulphuric acid. The yield amounted to 64.2%.

Provenance & Evidence