Preparing Accurate Standard Gas Mixtures of Volatile Substances at Low Concentration Levels

Uyanık, Ahmet; Tinkiliç, Nihat

doi:10.1007/s00897990313a

Cited by 13 publications

(3 citation statements)

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“…Calibration Procedure. For the gas analysis, gas standards are prepared in the laboratory based on a method described by Uyanik and Tinkilic . A minute amount (1−100 μL) of liquid solution is injected into the glass sampling bulb that has been flushed with helium as the inert gas.…”

Section: Methodsmentioning

confidence: 99%

“…The solution evaporates in the glass sampling bulb. This method assumes that the generated vapors act as ideal gases under common laboratory conditions . In this work, the vapor was treated as a real gas and the volume ( V vap ) produced from the evaporation of the liquid analyte in the glass sampling bulb is calculated using eq 2: The compressibility factor ( z ) is obtained from the Peng− Robinson equation of state .…”

Section: Methodsmentioning

confidence: 99%

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Kinetics of Structure H Gas Hydrate

2005

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Experimental data on the kinetics of formation of structure H gas hydrate obtained in a semibatch stirred vessel at pressures of 0.63−1.5 MPa above equilibrium are reported. Methane was used as a guest substance and neohexane, tert-butyl methyl ether, and methylcyclohexane were used as the large molecule guest substance (LMGS). The results indicate that the rates of hydrate formation and the induction times are dependent on the magnitude of the driving force and the type of LMGS. When tert-butyl methyl ether is used as the LMGS, rapid hydrate formation and a much smaller induction time can be achieved. Furthermore, the methane consumption rate for hydrate formation in the presence of tert-butyl methyl ether is 3 times greater than that for a pure methane−water system. It was also observed that, although the induction period was greatly shortened by the memory effect, the rate of gas consumption rate was not affected. Hydrate decompositions were also conducted at a pressure 20% below equilibrium. The system with tert-butyl methyl ether as LMGS exhibited the fastest decomposition rate.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Kinetics of Structure H Gas Hydrate

2005

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“…Pure samples of the gases of interest are prepared in a 10L flask at known low concentration of approximately 300ppm [11]. The responses of a number of gas sensors to different gas samples are experimentally collected at a constant temperature.…”

Section: Methodsmentioning

confidence: 99%