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1.118 Aktuelle Fachpublikationen zum Thema temperature

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In Situ Raman Spectroscopic Studies on Small-Cage Occupancy of Methane in the Simple Methane and Methane + Deuterated Tetrahydrofuran Mixed Hydrates

18.08.2015 | Caroline T. Moryama; Takeshi Sugahara; Danilo Y. Yatabe Franco; Hiroko Mimachi, Journal of Chemical & Engineering Data, 2015

To investigate the small-cage occupancies of methane (CH4) in the structure-I and structure-II hydrates, under the three-phase equilibrium conditions of clathrate hydrate, aqueous solution, and fluid CH4 phases, in situ Raman spectra of the guest molecules in the simple CH4 hydrate and the CH4 + ...

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Densities and Viscosities of Binary Mixtures of 2-Ethyl-1,1,3,3-tetramethylguanidinium Ionic Liquids with Ethanol and 1-Propanol

12.08.2015 | Xiaoxing Lu; Di Wu; Dengfeng Ye; Youping Wang; Yongsheng Guo; Wenjun Fang, Journal of Chemical & Engineering Data, 2015

Two guanidinium-based ionic liquids (ILs), 2-ethyl-1,1,3,3-tetramethylguanidinium bis(trifluoromethylsulfonyl)imide ([TMGEt][NTf2]) and ethyl sulfate ([TMGEt][C2OSO3]) were synthesized and characterized. Experimental densities and viscosities for the binary mixtures of the ILs with ethanol and ...

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Reversibility of Asphaltene Aggregation in Live Oils: Qualitative and Quantitative Evaluation

10.08.2015 | Saber Mohammadi; Fariborz Rashidi; Mohammad-Hossein Ghazanfari; Sayed Ali Mousavi-Dehghani, Journal of Chemical & Engineering Data, 2015

Despite the numerous experimental studies concerning asphaltene, the extent of reversibility of asphaltene aggregation at reservoir conditions remains still an elusive and controversial issue in the available literature. In this work, a series of depressurization and repressurization experiments ...

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Experimental Determination of the Equilibrium Water Content of CO2 at High Pressure and Low Temperature

10.08.2015 | Louis V. Jasperson; Jeong Won Kang; Chul Soo Lee; Don Macklin; Paul M. Mathias; Rubin J. McDougal; Won Gu Rho; David ..., Journal of Chemical & Engineering Data, 2015

Quantitative understanding of the water content of pipeline fluids in equilibrium with hydrates is critically important to ensure pipeline flow without hindrance from solid precipitation. This paper focuses on pipelines with CO2-rich fluids in cold environments (such as those in Alaska) and ...

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Phase Equilibria of Double Semiclathrate Hydrates Formed with Tetraamylammonium Bromide Plus CH4, CO2, or N2

10.08.2015 | Lingli Shi; Deqing Liang, Journal of Chemical & Engineering Data, 2015

Dissociation data for the semiclathrate hydrates formed with tetraamylammonium bromide (TAAB: C20H44NBr) + CH4, + CO2, or + N2 were measured in the pressure range of (1.33 to 20.37) MPa and temperature range of (279.8 to 291.9) K at (0.050 and 0.100) mass fraction of TAAB. The experimental data ...

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Representation and Validation of Liquid Densities for Pure Compounds and Mixtures

07.08.2015 | Vladimir Diky; John P. O’Connell; Jens Abildskov; Kenneth Kroenlein; Michael Frenkel, Journal of Chemical & Engineering Data, 2015

Reliable correlation and prediction of liquid densities are important for designing chemical processes at normal and elevated pressures. A corresponding-states model from molecular theory was extended to yield a robust method for quality testing of experimental data that also provides predicted ...

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Surface Tension of Tricyanomethanide- and Tetracyanoborate-Based Imidazolium Ionic Liquids by Using the Pendant Drop Method

06.08.2015 | Thomas M. Koller; Michael H. Rausch; Kaija Pohako-Esko; Peter Wasserscheid; Andreas P. Fröba, Journal of Chemical & Engineering Data, 2015

The surface tension of nine tricyanomethanide ([C(CN)3]−)- and tetracyanoborate ([B(CN)4]−)-based ionic liquids (ILs) carrying a homologous series of the 1-alkyl-3-methylimidazolium ([alkyl-MIM]+) cations [EMIM]+ (ethyl), [BMIM]+ (butyl), [HMIM]+ (hexyl), [OMIM]+ (octyl), and [DMIM]+ (decyl) was ...

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Dissociation Constants and Solubilities of Dalbergin and Nordalbergin in Different Solvents

05.08.2015 | Wanjun Kong; Rui Sun; Yanjuan Gao; Guanjun Nan; Guangde Yang; Yiping Li, Journal of Chemical & Engineering Data, 2015

The dissociation constants (pKa) of dalbergin and nordalbergin were measured at 298.2 K using ultraviolet (UV) spectroscopy method. The solubilities of dalbergin and nordalbergin in water, methanol, propanone, ethyl ethanoate, trichloromethane, and hexane have been determined by the UV ...

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Comparative Study of Sodium Phosphate and Sodium Sulfate in Aqueous Solutions at (298.15 to 353.15) K

04.08.2015 | Mohamed El Guendouzi; Mohammed Aboufaris, Journal of Chemical & Engineering Data, 2015

The binary and ternary aqueous solutions of sodium phosphate or/and sulfate were studied using the hygrometric method from dilution to saturation in the temperature range from (298.15 to 353.15) K. The hygrometric measurements of the binary systems were combined with reference pure water, ...

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Isothermal Vapor–Liquid Equilibrium (VLE) and Vapor–Liquid–Liquid Equilibrium (VLLE) Data for Two Binary Systems Containing Perfluorohexane with Carbon Monoxide or Hydrogen Sulfide at (293, 313, and 333) K

04.08.2015 | Mulamba Marc Tshibangu; Alain Valtz; Caleb Narasigadu; Christophe Coquelet; Deresh Ramjugernath, Journal of Chemical & Engineering Data, 2015

Isothermal vapor–liquid equilibrium (VLE) and vapor–liquid–liquid equilibrium (VLLE) data are presented for binary systems containing perfluorohexane (C6F14) with carbon monoxide (CO) or hydrogen sulfide (H2S). Measurements were undertaken at three temperatures, viz. (293, 313, and 333) K, with ...

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