The Captura Direct Ocean Process with individual process step descriptions.

Project Description

Captura Corporation will develop a conceptual design of an up to 1,000 ton-carbon dioxide (CO₂)/year integrated abiotic direct ocean capture (DOC) system that includes water intake/outfall, pre-filtration systems, high-performance electrodialysis system, and gas-liquid contactor-based CO₂ stripping system for a future deployment on an offshore gas/oil platform. Captura’s DOC technology involves a highly efficient electrochemical pH-swing-based system (EpHs) that extracts high-purity CO₂ from the dissolved inorganic carbon in oceanwater and returns de-carbonized oceanwater back to the ocean with no byproducts.

The scope of work for the project will include a techno-economic analysis (TEA); a life cycle analysis (LCA); engineering assessment of the DOC technology’s synergy and coupling with a variety of offshore platforms and storage sites; optimization of the EpHs approach; assessment of the marine ecosystem impacts of the system’s decarbonized oceanwater; and monitoring, reporting and verification (MRV) of the CO₂-drawdown at the air/oceanwater interface.

Project Benefits

The Carbon Dioxide Removal (CDR) Program is fostering the development of a diverse set of advanced CDR technologies (e.g., direct air capture [DAC] with durable storage, biomass carbon removal and storage, enhanced mineralization, ocean-based CDR, etc.). Conceptual design and feasibility studies that assess the viability of abiotic DOC technologies (e.g., electrochemical engineering processes and ocean alkalinity enhancement), in addition to field validation tests on down-selected technologies in an integrated system, are key research and development stages for enabling the acceleration of ocean processes that remove CO₂ from the atmosphere. Advancement of these technologies will make progress toward achievement of the U.S. Department of Energy’s (DOE) Carbon Negative Shot target of less than $100/net tonne CO₂-equivalent removed (i.e., both capture and storage, with costs accounting for at least 100 years of durable secure geologic storage) by 2032.

Presentations, Papers, and Publications

• Conceptual Design of a Direct Ocean Capture System on an Offshore Platform (Mar 2024)
  Project Kickoff Meeting Presentation

Contact Information