Abstract

This work presents an experimental study of densities and viscosities of aqueous AMP (2-amino-2-methyl-1-propanol) + MEA (monoethanol amine) + H2O solutions with and without CO2. Amine concentrations were at AMP to MEA mass % ratios of 21/9, 24/6, 27/3 by maintaining 70 mass % of H2O. Density measurements were performed in a temperature range from 293.15 K to 343.15 K and viscosity was measured at temperatures from 293.15 K to 363.15 K. The excess molar volume was determined from experimental density data. A Redlich-Kister type polynomial of excess molar volume was adopted to represent the density of unloaded aqueous mixtures. For CO2 loaded solutions, Setschenow-type correlations and modified Weiland's density and viscosity correlations were used to fit density and viscosity data. Eyring's viscosity model was used to evaluate free energy of activation for viscous flow of mixtures through measured density and viscosity data. The volumetric and viscometric properties of aqueous mixtures were analyzed through the molecular structure and interactions. A correlation was proposed for the free energy of activation of viscous flow to represent viscosity of CO2 loaded solutions. The results reveal that the proposed correlations for the density and viscosity of mixtures are in good agreement with measured data.

Highlights

  • The amine-based post combustion CO2 capture (PCC) is regarded as a reliable and economical technology [1,2]

  • The proposed density and viscosity correlations to represent the data are discussed in relevant sections

  • The measured density data were fit into a Setschenow-type correlation with 0.09%, 0.08% and 0.19% AARD and 2.8 kg·m−3, 2.21 kg·m−3 and 4.2 kg·m−3 absolute maximum deviation (AMD) for mixtures of 21/9, 24/6 and 27/3 of AMP mass %/monoethanol amine (MEA) mass % respectively

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Summary

Introduction

The amine-based post combustion CO2 capture (PCC) is regarded as a reliable and economical technology [1,2]. Aqueous alkanolamines of monoethanol amine (MEA), methyldiethanolamine (MDEA) and diethanolamine (DEA) has been used in acid gas removal for decades. Conventional absorbents exhibit several disadvantages such as high regeneration energy, poor absorption capacity and amine degradation. The interest towards amine blends as an absorbent in CO2 absorption has increased to optimize the energy demand and operational cost. The applicability of different amine blends have been tested to study mass transfer, reaction kinetics, solubility and absorption capacity [4,5,6,7,8] and pilot plant operations have been performed [9,10]

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