Absorptive Concentration

During absorptive concentration air loaded with the volatile organic compounds (VOC) is introduced to a cleaning liquid and taken by it. During multiple absorber steps the air is cleaned to a desired limit value and the liquid is loaded to a maximum with the VOC. The liquid is released from the VOC in a desorption column and can be reused again for cleaning of the air. During the regeneration (desorption) the cleaning is liquid heated and got into contact with a small air stream. The VOC moves from the liquid to the air and enrich it. By this procedure a high concentration of VOC in the desorption air can be achieved.

Advantages:

• Higher concentration compared to alternative methods
• Resistant against dirt, dust and adhesive substances
• Spatial and temporal separation of absorption and desorption is possible

Applications and limitations:

• Recommended at high volumes with low VOC concentration, > 100,000 m³/h, < 250 mg/m³
• Boiling point VOC > 80 °C
• Waste air has to be free of acids and oxidants