Water → p-Toluenesulfonic acid

Participants

Reaction Steps

Into a four-necked flask provided with a stirrer, a thermometer, a constant water receiver with a reflux condenser and a nitrogen gas inlet was charged a mixture of 190.0 parts of p-toluene sulfonic acid monohydrate and 266.0 parts of xylene. The temperature was raised while blowing nitrogen gas and then the stirring was continued at 140° C. for 2 hours to remove 18 parts of water. After the reaction mass was cooled in air, the nitrogen gas inlet was replaced with a dropping funnel and 250.0 parts of Kardula E10 was added dropwise through the dropping funnel for 30 minutes while stirring at room temperature. After the completion of the dropwise addition, the stirring was continued at room temperature for 4 hours, and the reaction was stopped at an acid value of involatile matter of not more than 1 to obtain an ester solution of p-toluene sulfonic acid esterified with equimole of Kardula E10 and having an effective component concentration (aromatic sulfonic acid) of 25%.

Provenance & Evidence