Volumetric Properties of Aqueous Sodium Salt of Amino Acids as CO2 Capture Solvent

Abstract

Objectives:To produce new and accurate data of density of aqueous solution of amino acid salts at different temperatures and to correlate it with molality. Methods: The densities of aqueous solutions of sodium salts of Amino acids such as L-cysteine, L-leucine, L-proline and L-valine have been measured using double-arm Pycnometer, placed in a transparent glass-walled water bath having thermal stability of (0.01 K) at concentrations range (0.01 to 0.15) mol L -1 and at 298.15, 303.15, 308.15, and 313.15 K. From density data ahead, apparent molar volumes (V ϕ ), the partial molar volumes (V ϕ 0 ), expansion coefficient (E ∞ ) and Hepler's constantwere calculated and analysed on the basis of the intermolecular interaction and molecular structure. Findings: The densities are observed to increase with concentration and decrease with increasing temperature. The positive values of partial molar volume (V ϕ 0 ) indicate strong sodium amino acids -water interactions. Novelty:For studied aqueous sodium salt solution of Amino acids, such properties have not yet been reported in the open literature and at such a lower concentrations range (0.01 to 0.15) mol L -1 .