Effect of methanol addition on water–CO2–diethanolamine system: Influence on CO2 solubility and on liquid phase speciation

Abstract : The aim of this study is the characterisation of VLE and chemical equilibria for the system CO2/diethanolamine (DEA)/H2O/methanol. The effect of MeOH composition has been studied using four compositions (from 0 to 30wt% of methanol with a fixed composition (30 wt%) of DEA), the measurement being made at T=298.15 K and at various CO2 loadings (from 0.2 to 0.8). An original experimental device was used. This device combines a FT-IR spectroscopy analysis of the liquid phase with a VLE measurement cell. The data base obtained, including the new solubility data and the liquid phase composition, allows the modelling of the system CO2/DEA/H2O/methanol using an electrolyte equation of state [Furst, W., Renon, H., 1993, Representation of excess properties of electrolyte solutions using a new equation of state, AIChE J, 39(2): 335-343] representing the equilibrium properties of the system and the liquid phase speciation. (C) 2008 The Institution of Chemical Engineers.
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A. Archane, L. Gicquel, E. Provost, Walter Fürst. Effect of methanol addition on water–CO2–diethanolamine system: Influence on CO2 solubility and on liquid phase speciation. Chemical Engineering Research and Design, Elsevier, 2008, 86 (6), pp.592. ⟨10.1016/j.cherd.2008.03.005⟩. ⟨hal-01185555⟩

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