Abstract

The absorption of carbon dioxide in aqueous solutions of piperazine (PZ) in a high pressure Jerguson cell was studied at high gas loadings (1.06–2.77) mo l C O 2 /mol PZ. Because of its cyclic and diamine characteristics, the reactivity and solubility of piperazine are higher than in other secondary amines. The solubility of CO 2 in aqueous solutions of piperazine was measured at (313 and 343) K for (0.3 and 1.2) M piperazine up to a pressure of 7400 kPa. The Electrolyte-NRTL model was used to correlate the solubility of CO 2 in aqueous solutions of piperazine. Eight adjustable ionic pair interaction parameters were estimated allowing for the correlation of the available experimental solubility data with an average deviation of 1–2% in CO 2 partial pressure. The model was tested by predicting published experimental literature data for both low and high gas loadings.

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