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Low energy packed tower and caustic recovery for direct capture of CO2 from air

Maryam Mahmoudkhani (Institutionen för energi och miljö, Värmeteknik och maskinlära) ; David W Keith ; Kenton H. Heidel ; Julian C Ferreira ; Robert S. Cherry
Energy Procedia (1876-6102). Vol. 1 (2009), 1, p. 1535-1542.
[Artikel, refereegranskad vetenskaplig]

We 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.

Nyckelord: air capture; packed tower; direct causticization; titanate; leaching; precipitation

Denna post skapades 2009-07-21. Senast ändrad 2013-10-29.
CPL Pubid: 95629


Institutioner (Chalmers)

Institutionen för energi och miljö, Värmeteknik och maskinlära (2005-2014)


Kemiska processer

Chalmers infrastruktur