反应详情

温度

200 °C

225.5 g (2.3 mol) of 100% strength sulphuric acid were added to 257.0 g (2.76 mol) of aniline in 460 ml of ortho oil. The suspension obtained was heated at 200° C. for 2.5 hours in a 1.3 1 enamel autoclave. After cooling, the mixture was filtered off with suction and the filter residue was dried. The 475.6 g of solid contained 80.7% of p-sulphanilic acid in addition to unchanged anilinium hydrogensulphate, based on the excess sulphuric acid employed. Aniline-2,4-disulphonic acid was not formed.

1. customThe suspension obtained
2. temperatureAfter cooling
3. filtrationthe mixture was filtered off with suction
4. customthe filter residue was dried
5. additionin addition to unchanged anilinium hydrogensulphate