QSPR Using MOLGEN-QSPR:  The Example of Haloalkane Boiling Points

2004 ◽  
Vol 44 (6) ◽  
pp. 2070-2076 ◽  
Author(s):  
Christoph Rücker ◽  
Markus Meringer ◽  
Adalbert Kerber
Keyword(s):  
Boiling Points

Gas-Cycle-Assisted Headspace Solid-Phase Microextraction Coupling with Gas Chromatography for Rapid Analysis of Organic Pollutants

2021 ◽  
Author(s):  
Wenli Zhu ◽  
Peige Qin ◽  
Lizhen Han ◽  
Xiaowan Zhang ◽  
Dan Li ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Organic Pollutants ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Rapid Analysis ◽  
Headspace Solid Phase Microextraction ◽  
Boiling Points

Herein, a new gas-cycle-assisted (GCA) headspace solid-phase microextraction (HS-SPME) device was designed to rapidly extract organic pollutants with high Kow and boiling points that have difficulty in volatilization from matrix...

Supercritical CO2 regeneration of activated carbon loaded with organic adsorbates

1997 ◽  
Vol 35 (7) ◽  
pp. 261-268 ◽  
Author(s):  
Kazuyuki Chihara ◽  
Kanji Oomori ◽  
Takao Oono ◽  
Yosuke Mochizuki
Keyword(s):  
Activated Carbon ◽  
Cost Estimation ◽  
Supercritical Co2 ◽  
Adsorption Equilibrium ◽  
Equilibrium Constants ◽  
Adsorption Dynamics ◽  
Boiling Points ◽  
Organic Adsorbates ◽  
Carbon Regeneration ◽  
Co2 Density

Supercritical CO2 regeneration is one of the possibilities for spent carbon regeneration loaded with some organics. Here, adsorption equilibrium and adsorption dynamics were evaluated for some typical organic pollutants under some supercritical CO2 conditions. A supercritical CO2 chromatograph packed with activated carbon (F-400, CAL) was used to detect the pulse responses of organics, which were analyzed by moment analysis. Adsorption equilibrium constants of some organics varied with CO2 density and their boiling points. Possibility of regeneration of each substance was discussed. Cost estimation was necessary and was the key point of this technique.

The determination of normal boiling points at high altitudes

1957 ◽  
Vol 34 (9) ◽  
pp. 440 ◽  
Author(s):  
Luis Levy ◽  
Oswaldo E. Proano
Keyword(s):  
High Altitudes ◽  
Boiling Points

QSPR Using MOLGEN-QSPR: The Example of Haloalkane Boiling Points.

ChemInform ◽  
2005 ◽  
Vol 36 (7) ◽  
Author(s):  
Christopher Ruecker ◽  
Markus Meringer ◽  
Adalbert Kerber
Keyword(s):  
Boiling Points

Cation mobilities in liquid and supercritical C1–C4 hydrocarbons

1980 ◽  
Vol 58 (14) ◽  
pp. 1490-1494 ◽  
Author(s):  
Norman Gee ◽  
Gordon R. Freeman
Keyword(s):  
Free Path ◽  
Ion Mobility ◽  
Diffusion Coefficients ◽  
Critical Region ◽  
Mean Free Path ◽  
Liquid Viscosity ◽  
Boiling Points ◽  
Rough Approximation ◽  
The Relationship ◽  
Lower Liquid

The relationship between ion mobility and liquid viscosity is commonly expressed as μ [Formula: see text] η−m. In hydrocarbons the value of m tends to be near 1.0 at η > 5 mP, m > 1.0 at ~5 < η < 1 mP, and m < 1.0 at η < 0.5 mP. Thus there is a maximum in a plot of μη against η−1 and Walden's rule (m = 1.0) is only a rough approximation. The decrease of μη as the critical region is approached is accompanied by an increase in the ratio of diffusion coefficients Dmolec/Dion. Ion mobilities in the liquids well below their normal boiling points are chiefly controlled by the fluidity. At higher temperatures and concomitant lower liquid densities and viscosities μη first increases, due to an increasing ion mean free path, then decreases as the critical region is approached, due to the increasing liquid compressibility and consequent electrostriction about the ion.

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