FORMATION AND RELEASE OF METHANOL AND HYDROGEN-CHLORIDE FROM DCE RECOVERY BOILER SYSTEMS

The 1990 Amendments to the U.S. Clean Air Act require the regulation o f hazardous air pollutants (HAPs). The combined system of air-blow bla ck liquor oxidation and recovery boilers with direct-contact evaporato rs and wet-bottom precipitators constitutes one of the major sources o f HAP emissions in a pulp and paper mill. This paper summarizes the re sults of laboratory studies and field tests to investigate the formati on, release, and destruction of HAP compounds, particularly methanol a nd hydrogen chloride, in recovery boiler systems with direct-contact e vaporators.