A test for two kinds of high concentrative wastewater produced by benz sulfonic mythylate products was performed. The results show that the wastewater from benz-sulfonic chlorizate was treated by lime slurry neutralization and vacuum evaporation process, while the CODCr
removal rate is 98.9% with influent CODCr
14,800 mg/L and effluent CODCr
161 mg/L;the wastewater from esterification was treated by caustic neutralization, vacuum evaporation, evaporating and fine-distilling methylalcohol process, while the CODCr
removal rate is 98.6% with influent CODCr
109,000 mg/L and effluent CODCr
1,529 mg/L;83.2 t/a methylalcohol and 139 t/a benz-sulfonic natrium can be recovered from drained wastewater with a production scope of 400 t/a benz-sulfonic methylate, and in the mean time,308.7 t/a CODCr
can be reduced.