Mahmoudkhani, M.Heidel, K.R.Ferreira, J.C.Cherry, R.S.2023-01-262009-02M. Mahmoudkhani, K.R. Heidel, J.C. Ferreira, David Keith, and R.S Cherry. 2009. “Low energy packed tower and caustic recovery for direct capture of CO2 from air.” Energy Procedia, 1, Pp. 1535-1542.1876-6102https://nrs.harvard.edu/URN-3:HUL.INSTREPOS:37374124We used a 6.5 m tall packed tower prototype to study the capturing rate of CO2 from air. The tower was operated at a pressure drop of less than 27 pa in the packing at 0.7m/sec air speed with a counter current flow mode and with NaOH or KOH solution as the absorbent. The tower consumed an average of ~30 kJe per mole CO2. We found that via an intermittent operation with a 5% duty cycle, the fluid pumping work reduced by 90%. A novel process for removing carbonates ions from alkaline solutions based on titanate compounds is compared to the traditional lime cycle for the caustic recovery. The titanate process reduces the high-grade heat requirement by ~50%. The results from experimental data of leaching and precipitation test support process design of the titanate cycle. In this paper, we also present the chemical process design.en-USGeneral MedicineJournal Article2023-01-2610.1016/j.egypro.2009.01.201