A freezing point cell for volatile solutions

Glew, D. N.; Rath, N. S.

doi:10.1088/0950-7671/42/8/453

Cited by 2 publications

(4 citation statements)

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“…These estimates of the congruent hydrate freezing temperature and composition and their standard errors are in general agreement with, and supersede all of our earlier estimates (8,10,15,18).…”

Section: Measurement Of Formation Of Hydratesupporting

confidence: 90%

“…The construction, testing, and the method of use of the freezing point cell have already been described (8). The data for the ice freezing points of the water solutions of EO were reported in part, and analysed in a different manner, earlier (I 1).…”

Section: Apparatus and Proceduresmentioning

confidence: 99%

“…Consequently, the observed solution supercooling was reduced and the resulting temperature of formation of hydrate was found to be slightly increased, and thus nearer to its true equilibrium value. All temperatures for the formation of hydrate listed in Table 2 were extrapolated from two or more measurements to zero supercooling (8).…”

Section: Measurement Of Temperature For Formation Of Hydratementioning

confidence: 99%

“…The congruent hydrate comprises 6.66E0.46H20 per unit cell, with EO molecules occupying mainly the six tetrakaidecahedral sites and filling at least one third of the two dodecahedral sites (8,9,10).…”

Section: Measurement Of Formation Of Hydratementioning

confidence: 99%

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Aqueous nonelectrolyte solutions. Part XIII. Ice and hydrate freezing points of aqueous ethylene oxide solutions and the formula of congruent ethylene oxide hydrate

Glew¹,

Rath²

1995

Can. J. Chem.

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Abstract:Ice freezing temperatures and hydrate formation temperatures have been measured by the dynamic cooling method for aqueous ethylene oxide (EO) solutions containing from 0 to 95 mol% EO. The ice and the congruent hydrate freezing temperatures exhibited standard errors on a single measurement of 0.004"C and 0.013OC, respectively. The ice-hydrate eutectic temperature was observed at -2.107OC with standard error O.OOl°C and composition 1.991 mol% EO with standard error 0.008 mol% EO. The congruent hydrate was found to freeze at 11.083°C with standard error 0.002"C and composition 12.64 mol% EO with standard error 0.02 mol% EO. The formula of the congruent hydrate was E0.6.91H20 with standard error 0.013 mol water/ mol EO. Only a single hydrate was found over the whole composition range down to -26°C: the shoulder of the hydrate freezing curve above 40 mol% EO resulted from the high activity coefficients to dilute water in concentrated EO solutions. Equations and best values for the ice freezing temperatures and the hydrate formation temperatures together with their standard errors were evaluated by the method of least squares.Key words: clathrate hydrate of ethylene oxide, freezing of water -ethylene oxide, ethylene oxide hydrate.RCsumC : Faisant appel h la mtthode de refroidissement dynamique sur des solutions aqueuses d'oxyde d'ethylitne (OE) contenant de 0 h 95% d'OE, on a mesure les temperatures de congtlation de la glace et de formation d'hydrate. Sur une seule mesure, les temperatures de congelation et de formation congruente d'hydrate ont presentts des erreurs standards qui sont respectivement de 0,004"C et 0,013°C. On a observe la temptrature eutectique glace-hydrate h-2,107"C, avec une erreur standard de 0,001 "C; la composition est alors de 1,991 mol% d'OE, avec une arreur standard de 0,008 mol% d'OE. On a trouvt que le point de congtlation de l'hydrate congruent est 1 1,083OC avec une erreur standard de 0,002"C et une composition de 12,64 mol% d'OE, avec une erreur standard de 0,02 mol% d'OE. La formule de I'hydrate congruent est 0E,6,91H20 avec une erreur standard de 0,013 mol d'eau par mol d'OE. On n'a trouve qu'un seul hydrate sur l'ensemble des compositions, jusqu'h -26,0°C : I'tpaulement observt dans la courbe de congtlation de I'hydrate, au-dessus de 40% d'OE, est le rtsultat de coefficients d'activite tlevts de l'eau dans des solutions concentrees en OE. On a fait appel h la mtthode des moindres carrts pour tvaluer les tquations, les meilleures valeurs des temptratures de congtlation et de formation d'hydrate ainsi que leurs erreurs standards. Mots clPs[Traduit par la redaction] As a part of earlier studies o n aqueous nonelectrolyte solutions and gas hydrates (1-17), the water -ethylene oxide (EO) system was of particular interest to us because the liquids water and EO (i) exhibited a complete range of liquid miscibility, and (ii) thus provided homogeneous solutions, which on cooling precipitated solid EO hydrate. The complete miscibility made it possible to measure directly the volumetric...

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Section: Measurement Of Formation Of Hydratesupporting

confidence: 90%

Section: Apparatus and Proceduresmentioning

confidence: 99%

Section: Measurement Of Temperature For Formation Of Hydratementioning

confidence: 99%

Section: Measurement Of Formation Of Hydratementioning

confidence: 99%

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