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Physical absorption (ammonia)


Technology Description

Physical absorption uses a liquid solvent to absorb CO2 from flue gases that have high CO2 partial pressures, without a chemical reaction occurring. Common physical solvents include Selexol (dimethyl ethers of polyethylene glycol) and Rectisol (methanol). Capture technology widely used commercially as part of the SMR hydrogen production process (TRL 11 for capture technology, TRL 9 for full CCS chain), with some projects storing captured CO2 via EOR.

Relevance for Net Zero

Using physical absorption-based CO2 capture in ammonia production has good potential to reduce emissions and is already commercially applied. Along with electrolytic hydrogen, it is one of the key competitors for reducing ammonia emissions.

Key Countries

United States, Canada

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