Phase equilibrium for ozone-containing hydrates formed from an (ozone + oxygen) gas mixture coexisting with gaseous carbon dioxide and liquid water

Sanehiro Muromachi, Ryo Ohmura, Yasuhiko H. Mori

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The paper reports the three-phase (gas + aqueous liquid + hydrate) equilibrium pressure (p) versus temperature (T) data for a (O 3 + O 2 + CO 2 + H 2O) system and, for comparison, corresponding data for a (O 2 + CO 2 + H 2O) system for the first time. These data cover the temperature range from (272 to 279) K, corresponding to pressures up to 4 MPa, for each of the three different (O 3 + O 2)-to-CO 2 or O 2-to-CO 2 mole ratios in the gas phase, which are approximately 1:9, 2:8, and 3:7, respectively. The mole fraction of ozone in the gas phase of the (O 3 + O 2 + CO 2 + H 2O) system was from ∼0.004 to ∼0.02. The modified pressure-search method, developed in our previous study [S. Muromachi, T. Nakajima, R. Ohmura, Y.H. Mori, Fluid Phase Equilib. 305 (2011) 145-151] for p-T measurements in the presence of chemically unstable ozone, was applied, having been further modified for dealing with highly water-soluble CO 2, for the (O 3 + O 2 + CO 2 + H 2O) system, while the conventional temperature-search method was used for the (O 2 + CO 2 + H 2O) system. The measurement uncertainties (with 95% coverage) were ±0.11 K for T, ±6.0 kPa for p, and ±0.0015 for the mole fraction of each species in the gas phase. It was confirmed that, at a given CO 2 fraction in the gas phase, p for the (O 3 + O 2 + CO 2 + H 2O) system was consistently lower than that for the (O 2 + CO 2 + H 2O) system over the entire T range of the present measurements, indicating a preference of O 3 to O 2 in the uptake of guest-gas molecules into the cages of a structure I hydrate.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalJournal of Chemical Thermodynamics
Volume49
DOIs
Publication statusPublished - 2012 Jun

Fingerprint

Ozone
Carbon Monoxide
Hydrates
Carbon Dioxide
Gas mixtures
Phase equilibria
hydrates
ozone
gas mixtures
carbon dioxide
Carbon dioxide
vapor phases
Oxygen
Water
Liquids
oxygen
liquids
Gases
water
temperature

Keywords

  • Carbon dioxide
  • Clathrate hydrate
  • Ozone
  • Phase equilibrium

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)

Cite this

@article{7b88572b700c4b10a36c14530e956eaa,
title = "Phase equilibrium for ozone-containing hydrates formed from an (ozone + oxygen) gas mixture coexisting with gaseous carbon dioxide and liquid water",
abstract = "The paper reports the three-phase (gas + aqueous liquid + hydrate) equilibrium pressure (p) versus temperature (T) data for a (O 3 + O 2 + CO 2 + H 2O) system and, for comparison, corresponding data for a (O 2 + CO 2 + H 2O) system for the first time. These data cover the temperature range from (272 to 279) K, corresponding to pressures up to 4 MPa, for each of the three different (O 3 + O 2)-to-CO 2 or O 2-to-CO 2 mole ratios in the gas phase, which are approximately 1:9, 2:8, and 3:7, respectively. The mole fraction of ozone in the gas phase of the (O 3 + O 2 + CO 2 + H 2O) system was from ∼0.004 to ∼0.02. The modified pressure-search method, developed in our previous study [S. Muromachi, T. Nakajima, R. Ohmura, Y.H. Mori, Fluid Phase Equilib. 305 (2011) 145-151] for p-T measurements in the presence of chemically unstable ozone, was applied, having been further modified for dealing with highly water-soluble CO 2, for the (O 3 + O 2 + CO 2 + H 2O) system, while the conventional temperature-search method was used for the (O 2 + CO 2 + H 2O) system. The measurement uncertainties (with 95{\%} coverage) were ±0.11 K for T, ±6.0 kPa for p, and ±0.0015 for the mole fraction of each species in the gas phase. It was confirmed that, at a given CO 2 fraction in the gas phase, p for the (O 3 + O 2 + CO 2 + H 2O) system was consistently lower than that for the (O 2 + CO 2 + H 2O) system over the entire T range of the present measurements, indicating a preference of O 3 to O 2 in the uptake of guest-gas molecules into the cages of a structure I hydrate.",
keywords = "Carbon dioxide, Clathrate hydrate, Ozone, Phase equilibrium",
author = "Sanehiro Muromachi and Ryo Ohmura and Mori, {Yasuhiko H.}",
year = "2012",
month = "6",
doi = "10.1016/j.jct.2012.01.009",
language = "English",
volume = "49",
pages = "1--6",
journal = "Journal of Chemical Thermodynamics",
issn = "0021-9614",
publisher = "Academic Press Inc.",

}

TY - JOUR

T1 - Phase equilibrium for ozone-containing hydrates formed from an (ozone + oxygen) gas mixture coexisting with gaseous carbon dioxide and liquid water

AU - Muromachi, Sanehiro

AU - Ohmura, Ryo

AU - Mori, Yasuhiko H.

PY - 2012/6

Y1 - 2012/6

N2 - The paper reports the three-phase (gas + aqueous liquid + hydrate) equilibrium pressure (p) versus temperature (T) data for a (O 3 + O 2 + CO 2 + H 2O) system and, for comparison, corresponding data for a (O 2 + CO 2 + H 2O) system for the first time. These data cover the temperature range from (272 to 279) K, corresponding to pressures up to 4 MPa, for each of the three different (O 3 + O 2)-to-CO 2 or O 2-to-CO 2 mole ratios in the gas phase, which are approximately 1:9, 2:8, and 3:7, respectively. The mole fraction of ozone in the gas phase of the (O 3 + O 2 + CO 2 + H 2O) system was from ∼0.004 to ∼0.02. The modified pressure-search method, developed in our previous study [S. Muromachi, T. Nakajima, R. Ohmura, Y.H. Mori, Fluid Phase Equilib. 305 (2011) 145-151] for p-T measurements in the presence of chemically unstable ozone, was applied, having been further modified for dealing with highly water-soluble CO 2, for the (O 3 + O 2 + CO 2 + H 2O) system, while the conventional temperature-search method was used for the (O 2 + CO 2 + H 2O) system. The measurement uncertainties (with 95% coverage) were ±0.11 K for T, ±6.0 kPa for p, and ±0.0015 for the mole fraction of each species in the gas phase. It was confirmed that, at a given CO 2 fraction in the gas phase, p for the (O 3 + O 2 + CO 2 + H 2O) system was consistently lower than that for the (O 2 + CO 2 + H 2O) system over the entire T range of the present measurements, indicating a preference of O 3 to O 2 in the uptake of guest-gas molecules into the cages of a structure I hydrate.

AB - The paper reports the three-phase (gas + aqueous liquid + hydrate) equilibrium pressure (p) versus temperature (T) data for a (O 3 + O 2 + CO 2 + H 2O) system and, for comparison, corresponding data for a (O 2 + CO 2 + H 2O) system for the first time. These data cover the temperature range from (272 to 279) K, corresponding to pressures up to 4 MPa, for each of the three different (O 3 + O 2)-to-CO 2 or O 2-to-CO 2 mole ratios in the gas phase, which are approximately 1:9, 2:8, and 3:7, respectively. The mole fraction of ozone in the gas phase of the (O 3 + O 2 + CO 2 + H 2O) system was from ∼0.004 to ∼0.02. The modified pressure-search method, developed in our previous study [S. Muromachi, T. Nakajima, R. Ohmura, Y.H. Mori, Fluid Phase Equilib. 305 (2011) 145-151] for p-T measurements in the presence of chemically unstable ozone, was applied, having been further modified for dealing with highly water-soluble CO 2, for the (O 3 + O 2 + CO 2 + H 2O) system, while the conventional temperature-search method was used for the (O 2 + CO 2 + H 2O) system. The measurement uncertainties (with 95% coverage) were ±0.11 K for T, ±6.0 kPa for p, and ±0.0015 for the mole fraction of each species in the gas phase. It was confirmed that, at a given CO 2 fraction in the gas phase, p for the (O 3 + O 2 + CO 2 + H 2O) system was consistently lower than that for the (O 2 + CO 2 + H 2O) system over the entire T range of the present measurements, indicating a preference of O 3 to O 2 in the uptake of guest-gas molecules into the cages of a structure I hydrate.

KW - Carbon dioxide

KW - Clathrate hydrate

KW - Ozone

KW - Phase equilibrium

UR - http://www.scopus.com/inward/record.url?scp=84857998237&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84857998237&partnerID=8YFLogxK

U2 - 10.1016/j.jct.2012.01.009

DO - 10.1016/j.jct.2012.01.009

M3 - Article

AN - SCOPUS:84857998237

VL - 49

SP - 1

EP - 6

JO - Journal of Chemical Thermodynamics

JF - Journal of Chemical Thermodynamics

SN - 0021-9614

ER -