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absorption processes have a good potential for large scale capture of but a large amount of absorbing solution has to be regenerated, undesirably increasing the consumption of energy such as sensible heat and latent heat of vaporization. In this study, a cooling crystallization process which would separate the -rich potassium bicarbonate crystals from -lean water was developed to reduce the energy penalty. Sterically hindered alkanolamine additives were used to enhance the removal efficiency and their antisolvent effect on the crystallization was found in a continuous cooling crystallizer. The production yields of crystals were increased in the sequence of 2-amino-2-methyl-1-propanol (AMP) nuclear magnetic resonance, the additives favored the formation of bicarbonate ions by steric hindrance effect and increased the supersaturation of . It is shown that the additives increase the mean size of crystals and crystal growth rate by increasing supersaturation. The additives are promising for enhancing the removal efficiency and reducing the regeneration energy cost of absorbing solution by promoting crystallization.

Cooling and Antisolvent Crystallization of Potassium Bicarbonate in the Presence of Sterically Hindered Alkanolamines