反应详情

温度

100 °C

300 g of 3-(chlorosulfonyl)benzoic acid containing 38.8% of water (corresponding to 183.6 g (0.83 mol) of 100% chlorosulfonylbenzoic acid) are admixed with 100 g of water and heated to 100° C. for 1 hour. Then 500 g of toluene are added dropwise over 1 hour and a total of 164 ml of water distilled off azeotropically with toluene. The reaction mixture is cooled and the precipitated product filtered off with suction. After drying at 100° C./100 torr (13.16 kPa) 163.5 g of 3-sulfobenzoic acid are obtained, the purity determined by titration being 98.2%; this corresponds to a yield of 95.4%.

1. distillationa total of 164 ml of water distilled off azeotropically with toluene
2. temperatureThe reaction mixture is cooled
3. filtrationthe precipitated product filtered off with suction
4. dry with materialAfter drying at 100° C./100 torr (13.16 kPa) 163.5 g of 3-sulfobenzoic acid
5. customare obtained