This document discusses packed column absorption and provides examples of calculations related to packed column performance. It contains the following key points: 1. Packed columns are frequently used for absorption and stripping when low pressure drops, corrosion resistance, or low liquid holdup is required. They provide better contact between gases and liquids compared to plate towers. 2. Packed column performance is analyzed using the height equivalent to a theoretical plate (HETP) which accounts for mass transfer efficiency. 3. Example calculations are provided to determine the overall mass transfer coefficient, HETP, minimum liquid flow rate, and number of theoretical plates for a packed column removing acetone from air using water. 4. A second example calculates the