Density and viscosity of aqueous solutions of Methyldiethanolamine (MDEA) + Diethanolamine (DEA) at high pressures

Abstract

In this paper, high pressure densities (up to 140 MPa) at six different temperatures (from 293.15 K to 393.15 K) are presented and viscosity measurements (up to 100 MPa) at five isotherms in the range of 313.15 K to 393.15 K are also reported, both for two aqueous solutions of MDEA(1) + DEA(2) with mass fractions of w1 = 0.1; w2 = 0.3 and w1 = 0.3; w2 = 0.1. Densities were measured using a vibrating tube densimeter (Anton Paar DMA HPM) with an expanded uncertainty (k = 2) better than 0.7 kg·m-3. Viscosity measurements were obtained using a falling body viscometer whose expanded relative uncertainty (k = 2) ranges from 2.5% for the highest viscosity till 3.2% for the lowest.