METHOD FOR REPROCESSING WASTEWATER FROM NITROBENZENE PRODUCTION

摘要

The present invention relates to a method for reprocessing alkaline wastewater produced during the cleaning of crude nitrobenzene obtained by the nitration of benzene, wherein (i) the alkaline wastewater is heated to a temperature of 150°C to 500°C at a pressure greater than atmospheric pressure with oxygen exclusion; (ii) the wastewater obtained in (i) is mixed with a base; (iii) the wastewater obtained in (ii) is further purified by stripping with a stripping gas, and the impurity-laden flow of stripping gas is cooled to a temperature of 10°C to 60°C.