METHOD FOR RECYCLING EXHAUST GASES COMPRISING NOX FROM WASTEWATER STREAMS FROM NITRATING PLANTS

摘要

The invention relates to a method for recycling alkaline process wastewater comprising nitrite from the nitration of aromatic compounds, wherein the alkaline process wastewater is acidified by adding acids, and the exhaust gas comprising nitrogen oxide released from the acidified process wastewater is recycled, comprising the following steps of: a) acidifying the process wastewater by adding acids to a pH value below 5, wherein a precipitating organic phase, an acidic aqueous phase, and a gaseous phase comprising NOx are formed, and b) drawing off the gaseous phase comprising NOx.