METHOD OF SUPPRESSING AMMONIA VAPORIZATION AT AMBIENT PRESSURE FROM AQUEOUS AMMONIA USING ADDITIVES

摘要

A method of suppressing ammonia evaporation is provided to improve the efficiency of aqueous ammonia, to save energy and to improve the purity of the recovered carbon dioxide in a carbon dioxide recovery apparatus by lowering the partial pressure of ammonia by adding additive. A method of suppressing ammonia evaporation in a carbon dioxide recovery apparatus comprises a step of adding additive selected from AMP (2-amino-2-methyl-1-propanol), AMPD (2-amino-2-methyl-1,3-propandiol), AEPD (2-amino-2-ethyl-1,3-propandiol), THAM (trihydroxymethyl aminomethane) and mixtures thereof to aqueous ammonia. The aqueous ammonia is used at the temperature of 0-90°C in the apparatus, and the amount of the additive for the method is 0.1-10wt% with respect to that of aqueous ammonia. The method is optionally combined with at least one of the water washing method, the condensation method and the method of elevating pressure in order to lower the partial pressure of ammonia. An aqueous ammonia for the carbon dioxide recovery apparatus comprises an additive selected from AMP (2-amino-2-methyl-1-propanol), AMPD (2-amino-2-methyl-1,3-propandiol), AEPD (2-amino-2-ethyl-1,3-propandiol), THAM (trihydroxymethyl aminomethane) and mixtures thereof.