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Physical adsorption (methanol)

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Technology Description

Physical separation is based on adsorption, in which molecules are captured on the surface of selective materials called adsorbents. Desorption of the CO2 (release from the surface) may be achieved using pressure swing adsorption (PSA), performed at high pressure, or vacuum swing adsorption (VSA), which operates at ambient pressure. A hybrid configuration also exists, known as vacuum pressure swing adsorption (VPSA).

Relevance for Net Zero

Using physical adsorption-based CO2 capture in coal-based methanol production has good potential to reduce emissions. Along with electrolytic hydrogen, CCUS is one of the key competitors for reducing methanol production emissions. Note that capture is not needed for natural gas-based methanol production, as the CO2 is in a quantity in the syngas that can be used in the final chemical.

Key Countries

China

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