CO2 capture in alkanolamine/room-temperature ionic liquid emulsions: A viable approach with carbamate crystallization and curbed corrosion behavior

By making use of alkanolamine/room-temperature ionic liquid emulsions, it has been found practicable to capture carbon dioxide up to stoichiometric maximum (0.5 mole of CO2 per mole of diethanolamine) through crystallization of CO2-captured product (DEA-carbamate) by avoiding equilibrium limitations. This enabled easy separation of a reasonably smaller (solid carbamate) volume promising cost effective regeneration. The scanning electron microscopy (SEM) and electrochemical corrosion studies further revealed that inclusion of ionic liquid helped suppress corrosion to an extent as low as 0.31 milli-inch per year.

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► Immiscible alkanolamine/room-temperature ionic liquid system for efficient CO2 capture.
► No equilibrium limitations owing to crystallization of CO2-captured product, DEA-carbamate (stoichiometric-maximum gas loading).
► Easy separation of solid product.
► Negligible corrosion occurrence.