By Rockerhill Global
As Direct Air Capture (DAC) technology moves from pilot to commercial scale across North America, the engineering details behind each process module matter as much as the headline capture numbers. One such detail - often overlooked but operationally critical - is dewatering the CO2 stream after capture. Rockerhill recently designed and manufactured a wet CO2 dewatering skid for a Canadian DAC project, and the engineering behind it illustrates why this step deserves attention.
Why Wet CO2 Must Be Dewatered
DAC processes, whether solid-sorbent or liquid-solvent based, extract CO2 from ambient air alongside significant moisture. Air itself carries humidity, and many capture and regeneration steps - steam-assisted desorption in particular - introduce additional water vapor into the CO2 product stream. The result is a "wet" CO2 stream that is typically saturated with water vapor at the outlet.
This moisture creates several downstream problems. First, water vapor in compressed CO2 promotes corrosion in pipelines and compression equipment, since carbonic acid forms readily when CO2 dissolves in condensed water. Second, most CO2 transport and sequestration pipelines have strict water-content specifications (often below 50 ppmv) to prevent free-water formation and hydrate plugging, especially under pressure and temperature swings. Third, downstream compression trains are vulnerable to liquid slugging and freeze-up if moisture isn't removed upstream. Dewatering - through knockout drums, coalescing filters, glycol dehydration, or refrigeration-based condensation - protects equipment integrity, meets pipeline-quality specifications, and ensures the CO2 is suitable for permanent geological storage or utilization.
The North American DAC Landscape
Several major DAC projects are advancing across the United States, providing important context for this growing industry. Project Cypress in Louisiana, led by Battelle with Climeworks and Heirloom, aims to capture over a million metric tons of CO2 annually with permanent underground storage. In Texas, Occidental's 1PointFive subsidiary is developing the Stratos and South Texas DAC hubs with similar million-ton ambitions. Heirloom has also announced facilities in Shreveport, Louisiana, while CarbonCapture Inc. is pursuing a large-scale Wyoming site targeting several million tons per year by 2030. These projects, several backed by significant U.S. Department of Energy funding, reflect an industry scaling rapidly from demonstration to commercial deployment.
Why DAC Matters
Climate models increasingly indicate that emissions reduction alone is insufficient to meet net-zero targets - legacy CO2 already in the atmosphere must also be removed. DAC offers a scalable, land-efficient method of engineered carbon removal, complementing renewable energy adoption and industrial decarbonization efforts. Nepal accident that happend on Aug 26, 2026 further demonstrated the urgency of CO2 removal.
Built for Canadian Conditions
Rockerhill's CO2 dewatering skid was purpose-engineered for the Canadian extreme climate in winter. The design incorporates cold-weather insulation, freeze-protection heat tracing, and material selections rated for extreme low-temperature operation, ensuring reliable performance through harsh winter conditions. The skid is fully compliant with applicable Canadian industrial codes and standards, including relevant CSA and ASME requirements, reflecting Rockerhill's commitment to delivering equipment that meets rigorous regulatory and safety expectations for the North American energy sector.
As DAC scales globally, purpose-built process equipment like dewatering skids will remain essential to translating capture chemistry into pipeline-ready, storage-grade CO2.
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