Low energy packed tower and caustic recovery for direct capture of CO2 from air
2009; Elsevier BV; Volume: 1; Issue: 1 Linguagem: Inglês
10.1016/j.egypro.2009.01.201
ISSN1876-6102
AutoresMaryam Mahmoudkhani, Kenton Heidel, João C. Ferreira, David W. Keith, Robert Cherry,
Tópico(s)CO2 Sequestration and Geologic Interactions
ResumoWe 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 0.7 m/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.
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