A phase-study apparatus for semimicro use above atmospheric pressure

Marshall, William L.; Wright, Henry W.; Secoy, C. H.

doi:10.1021/ed031p34

Cited by 22 publications

(12 citation statements)

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“…To test the method for accuracy we rst measured salt solutions of Na 2 SO 4 , which have been studied extensively before. [25][26][27][28][29][30][31][32][33][34][35] For K 2 SO 4 and K 2 HPO 4 much less data is available in the literature. Subsequently, measurements above 200 C on the ternary system Na 2 SO 4 -K 2 SO 4 -H 2 O were performed.…”

Section: Introductionmentioning

confidence: 99%

High pressure differential scanning calorimetry of the hydrothermal salt solutions K2SO4–Na2SO4–H2O and K2HPO4–H2O

Reimer

Vogel

2013

RSC Adv.

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Aqueous salt solutions under hydrothermal conditions play an important role in geochemistry as well as in processes using hot compressed water as the process medium such as supercritical water oxidation (SCWO) and supercritical water gasification (SCWG). Isochoric high pressure differential scanning calorimetry (HP-DSC) was used as an accurate technique to investigate the phase behavior of such solutions under hydrothermal conditions. New data in the low concentration range (0.14-15.0 mass%) has been collected for the binary systems K 2 SO 4 -H 2 O, Na 2 SO 4 -H 2 O and K 2 HPO 4 -H 2 O. Furthermore we have discovered a liquid-liquid immiscibility in the ternary system K 2 SO 4 -Na 2 SO 4 -H 2 O, which has not been reported before.

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Section: Introductionmentioning

confidence: 99%

High pressure differential scanning calorimetry of the hydrothermal salt solutions K2SO4–Na2SO4–H2O and K2HPO4–H2O

Reimer

Vogel

2013

RSC Adv.

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“…Tile equipment used was nearly, identical to that described by Marshall et al [4] although the method of sample preparation was modified so that more mlbrmation could be obtained from the experiment. Note that the apparatus used for this study was not tile same as that used by Marshall and Jones [ 1 ].…”

Section: Capillary-tube Methodsmentioning

confidence: 99%

CaCl2-H2O in the supercritical and two-phase ranges

et al. 1995

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Critical temperatures (7",) and densities (p,)Ibr aqt,eous C~,CI: solutions were measured using two difl'erent optical techniques. Measurements of 7", were made using sealed silica capillaries containing 0.3. [).5, 1.0, and 2.0 molal CaCI2(aq) solutions. The T, values from these measurements are 661. 666. 678, and 738 K. respectively. Critical temperatures were also determined from measured homogenization temperatures and the observed mode of homogenization {i.e.. to the liquid or vapor phase or by lading of the meniscus) in synthetic fluid inclusions. Critical temperatures determined by the second method Ibr 1.0. 2.0, and 3.0 molal CaClz(aq) solutions are 68(I. 739. and 838 K. respectively. The T, for 4.11 molal CaCl.,laq) was fot, nd to be in excess of 933 K. The capillary-tube measurements yield approximate valt, es of the critical density p,. but do not give the critical pressure P,. Approximate wdues of P, are available, however. from other sources.

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“…The equipment used was nearly identical to that described by Marshall et al [4] although the method of sample preparation was modified so that more information could be obtained from the experiment. Note that the apparatus used for this study was not the same as that used by Marshall and Jones [1].…”

Section: Capillary Tube Methodsmentioning

confidence: 99%