After oxidation of the pollutants in the pharmaceutical industry, it can be necessary to eliminate any halogenated compounds from the inorganic residues by means of absorption and/or a catalytic reactor is required to separate nitrous oxides into nitrogen and oxygen. Here, Dürr optimizes energy management within exhaust air purification systems. If liquid solvent residues are available, they are used in order to save on primary energy.
Conditions: Normally small air flows with sometimes high peak concentrations, very often halogenated hydrocarbons as Methylenechloride. Other solvents that may be present in this process are Acetone, Isopropanole and many others.
Abatement System Recommendation: Dürr recommends the Ecopure® VAR Direct Fired Thermal Oxidizer. In specific conditions, the addition of a waste heat steam boiler and scrubber would be beneficial. In many instances though, the Ecopure® RTO Regenerative Thermal Oxidizerfabricated with corrosion resistant materials is effective if exhaust gas is diluted with fresh air below 25 % of the lower explosion limit before the RTO inlet.
Conditions: Normally about 3,000 to 6,000 Nm³/h per dryer.
Abatement System Recommendation: Dürr’s recommendation is the Ecopure® RTO Regenerative Thermal Oxidizer or Ecopure® RL rotary Regenerative Thermal Oxidizer after dilution of the exhaust air with fresh air below 25 % of the lower explosion limit.
Conditions: Normally, small air flows around 5,000 Nm³/h and medium concentrations around 8 g/Nm³ of Acetone, Isopropanole, or sometimes, but very seldom, Methylenechloride.
Abatement System Recommendation: Dürr can provide an Ecopure® TAR Recuperative oxidizer, Ecopure® RTO Regenerative Thermal Oxidizer or Ecopure® RL rotary Regenerative Thermal Oxidizer. if Methylenechloride is part of the process stream for API production, then a Ecopure VAR Direct Fired Thermal Oxidizer or Ecopure® RTO Regenerative Thermal Oxidizer is more applicable.