TY - JOUR
T1 - Solubility of NaHCO3 inSystems of Aqueous Glycols (Monoethylene Glycol, Diethylene Glycol,Triethylene Glycol, and Tetraethylene Glycol): The Role of Solvation
AU - Neerup, Randi
AU - Villadsen, Sebastian N. B.
AU - Thomsen, Kaj
AU - Fosbøl, Philip L.
PY - 2021
Y1 - 2021
N2 - The solubilityand density of NaHCO3 in the systems: monoethylene glycol (MEG)–water, diethylene glycol (DEG)–water, triethylene glycol (TEG)–water, and tetraethylene glycol (TeEG)–water have been measured over theentire concentration range from pure water to pure glycol. Experimentalmeasurements have been conducted at the temperatures 5, 20, 40, and60 °C and at atmospheric pressure. The solubility of NaHCO3 in all glycol mixtures increases with increasing temperatures.Solubility is largest in aqueous MEG and decreases with the highermolecular weights of glycol used. Local minima were observed in allsystems in the concentration range 80–90 wt % glycol, salt-free.On a mole fraction scale, minima were found at x(glycol,salt-free) = 0.5. There is a clear tendency that two solvate mechanismsexist with a 1:1 solvation relation. One type of solvation is formedin NaHCO3–water, and a second type is formed inNaHCO3–glycol. The density results showed a linearincrease up to a glycol concentration ≈80 wt %. Above 80 wt%, the density seemed to form a minima similar to the solubility phasediagrams.
AB - The solubilityand density of NaHCO3 in the systems: monoethylene glycol (MEG)–water, diethylene glycol (DEG)–water, triethylene glycol (TEG)–water, and tetraethylene glycol (TeEG)–water have been measured over theentire concentration range from pure water to pure glycol. Experimentalmeasurements have been conducted at the temperatures 5, 20, 40, and60 °C and at atmospheric pressure. The solubility of NaHCO3 in all glycol mixtures increases with increasing temperatures.Solubility is largest in aqueous MEG and decreases with the highermolecular weights of glycol used. Local minima were observed in allsystems in the concentration range 80–90 wt % glycol, salt-free.On a mole fraction scale, minima were found at x(glycol,salt-free) = 0.5. There is a clear tendency that two solvate mechanismsexist with a 1:1 solvation relation. One type of solvation is formedin NaHCO3–water, and a second type is formed inNaHCO3–glycol. The density results showed a linearincrease up to a glycol concentration ≈80 wt %. Above 80 wt%, the density seemed to form a minima similar to the solubility phasediagrams.
U2 - 10.1021/acs.jced.0c00538
DO - 10.1021/acs.jced.0c00538
M3 - Journal article
SN - 0021-9568
VL - 66
SP - 222
EP - 233
JO - Journal of Chemical and Engineering Data
JF - Journal of Chemical and Engineering Data
IS - 1
ER -