Session 24. Oral Presentation for: Amine based liquid capture technology for direct air capture of CO2 – an overview on technology development

Presented on 29 May 2025: Session 24 The large-scale deployment of direct air capture (DAC) technologies is essential to meet the global target of limiting temperature increase to below 2°C. Amine-based liquid capture technology, as the leading method for point-source CO2 capture, holds promise as a low-cost and scalable solution for DAC. We previously reported that the cost of this technology could approach US$100/tCO2, using a non-volatile absorbent, inexpensive cooling towers as gas–liquid contactors, and scaling up to capture 1 million tonnes of CO2 per year. To further reduce CO2 capture costs, we developed a second-generation DAC system, named the mist contactor. This system atomises the absorption liquid into fine droplets, increasing the contact area between the liquid and air. The resulting lower liquid-to-gas ratio, reduced gas-side pressure drops, and potentially higher capture rates are expected to reduce CO2 capture costs even further. We developed an optimised process design and model as a baseline for the design and construction of a pilot-scale system capable of capturing approximately 100 tonnes of CO2 per year. For DAC to contribute to achieving net-zero emissions, the CO2 captured must be either stored underground or utilised. Integrating DAC with downstream processes can further reduce costs by sharing infrastructure between capture, storage, and utilisation. A preliminary assessment of the integration between DAC and downstream processes, such as CO2 compression and fuel production, has been conducted and will be presented. To access the Oral Presentation click the link below. To read the full paper click here