Solid - liquid phase diagram for ethylene glycol + water

Cordray, D.R; Kaplan, Lisa R.; Woyciesjes, Peter; T, Kozák

doi:10.1016/0378-3812(95)02947-8

Cited by 67 publications

(44 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reduction in water–water H‐bond probabilities in TEG solutions versus MEG solutions seen in Figure was small compared to the increase in water–water H‐bond lifetimes, which is disadvantageous for the freezing point depression. Thus, the longer water–water H‐bond lifetime in TEG vs. MEG solutions, may be a significant contributor to making MEG a better antifreeze agent than TEG at mixtures close to 50% aqueous glycol solutions …”

Section: Resultsmentioning

confidence: 99%

Hydrogen bond lifetimes and statistics of aqueous mono‐, di‐ and tri‐ethylene glycol

Olsen

Kvamme

2016

AIChE Journal

View full text Add to dashboard Cite

Hydrogen bond statistics, energy distributions of hydrogen bonds and hydrogen bond lifetimes for aqueous monoethylene glycol (MEG), diethylene glycol (DEG), and triethylene glycol (TEG) were investigated at temperatures ranging from 275 to 370 K at 101.325 kPa using molecular dynamics simulations. Each individual type of hydrogen bond were studied separately to better understand how each type of hydrogen bond affected the collective behavior often measured in experiments. We also studied the effects of glycols on water–water hydrogen bond structures and lifetimes. Decay constants for hydroxyl type hydrogen bonds, as well as for water based hydrogen bonds were in the same order, thus indicating that all these hydrogen bonds play an essential role in the process of dielectric relaxation. Correlations between water hydrogen bond distances and angles were not affected markedly by adding glycols. However, hydrogen bond lifetimes increased by 9, 29, and 62 times by adding MEG, DEG, and TEG, respectively. © 2016 American Institute of Chemical Engineers AIChE J, 63: 1674–1689, 2017

show abstract

Section: Resultsmentioning

confidence: 99%

Hydrogen bond lifetimes and statistics of aqueous mono‐, di‐ and tri‐ethylene glycol

Olsen

Kvamme

2016

AIChE Journal

View full text Add to dashboard Cite

show abstract

“…Dry ice was used to cool the ethylene glycolwater solutions. The target bath temperatures (T c ) of À88C, À118C, À158C, and À208C, were adjusted by change the concentration of glycol concentration in water according the phase diagram reported (Cordray et al, 1996). The experiment at 08C was performed in ice-water bath without adding ethylene glycol.…”

Section: Sample Treatmentsmentioning

confidence: 99%

The kinetics of cellulose dissolution in sodium hydroxide solution at low temperatures

Wang

Deng

2008

Biotech & Bioengineering

View full text Add to dashboard Cite

The dissolution kinetics of cellulose in sodium hydroxide in the presence and absence of urea at low temperature was studied. High molecular weight cotton linter with degree of polymerization of 850 was used for dissolution study. The cotton linter was separated from the dissolution slurry at different dissolution times, and the change of the crystal structure of cotton linter was characterized by Powder X-Ray Diffraction. The rate of decrystallization of cellulose was obtained and the activation energy for cellulose decrystallization in sodium hydroxide solution was derived using Eyring equation. The effect of urea additive was discussed.

show abstract

“…An aqueous solution of ethylene glycol (EG) is used as an antifreeze solution for various purposes represented by the heat carrier medium in the radiator of a car engine, since the mixed solution shows an extremely lower freezing point (< -50 °C) than those of pure water and pure EG, which are frozen at 0 °C and -12.6 °C, respectively, at an ambient pressure. The antifreeze effect has been known to exhibit the best performance at an EG molar fraction (x EG ) of 0.29 ( 60 wt%) exhibiting the lowest freezing point [1,2]. Although the phase diagram of EG-water is typical for a binary solution, 'double eutectic points' are found at x EG = 0.29 and 0.55, which indicates a formation of a 'hydrated species' in the concentration range between the two eutectic points.…”

Section: Introductionmentioning

confidence: 99%

Molecular structural analysis of hydrated ethylene glycol accounting for the antifreeze effect by using infrared attenuated total reflection spectroscopy

Shimoaka

Hasegawa

2016

Journal of Molecular Liquids

View full text Add to dashboard Cite

To reveal the antifreeze protection mechanism of an aqueous solution of ethylene glycol (EG) at a molecular level, concentration-dependent infrared spectra are analyzed with an aid of chemometrics. The principal component analysis (PCA) of the spectra reveals that the spectral variation is explained by the quantity changes not only of 'bulky water' and the 'bulky EG,' but also of a 'water/EG complex.' After a spectral decomposition using the alternative least squares (ALS) analysis, the spectrum of the complex reveals that the EG molecule keeps the gauche conformation, and the terminal hydroxyl groups are hydrogen bonded by water molecules, which is a key to understand the antifreeze effect. In addition, the complex is found to comprises an EG molecule with four water molecules. Since the quantity of the complex attains the maximum at an EG concentration of 60 wt%, at which the freezing point becomes lowest, the complex is concluded to be a key hydrated species for the antifreeze effect. The generation process of the water/EG complex is also studied by using the time-resolved IR spectroscopy, which consistently confirms the spectral discussion made above.

show abstract

Solid - liquid phase diagram for ethylene glycol + water

Cited by 67 publications

References 6 publications

Hydrogen bond lifetimes and statistics of aqueous mono‐, di‐ and tri‐ethylene glycol

Hydrogen bond lifetimes and statistics of aqueous mono‐, di‐ and tri‐ethylene glycol

The kinetics of cellulose dissolution in sodium hydroxide solution at low temperatures

Molecular structural analysis of hydrated ethylene glycol accounting for the antifreeze effect by using infrared attenuated total reflection spectroscopy

Contact Info

Product

Resources

About