Vapor pressure curve determination of α-lipoic acid raw material and capsules by dynamic thermogravimetric method

2012 ◽  
Vol 544 ◽  
pp. 95-98 ◽  
Author(s):  
Alyne da Silva Portela ◽  
Maria das Graças Almeida ◽  
Ana Paula Barreto Gomes ◽  
Lidiane Pinto Correia ◽  
Paulo Cesar Dantas da Silva ◽  
...  
Keyword(s):  
Vapor Pressure ◽  
Lipoic Acid ◽  
Raw Material ◽  
Pressure Curve ◽  
Thermogravimetric Method ◽  
Vapor Pressure Curve ◽  
Curve Determination

On the Way to Determination of the Vapor-Pressure Curve of Pure Water

2012 ◽  
Vol 33 (8-9) ◽  
pp. 1374-1389 ◽  
Author(s):  
S. Mokdad ◽  
E. Georgin ◽  
I. Mokbel ◽  
J. Jose ◽  
Y. Hermier ◽  
...  
Keyword(s):  
Vapor Pressure ◽  
Pure Water ◽  
Pressure Curve ◽  
Vapor Pressure Curve ◽  
The Way

Development of a quasi-adiabatic calorimeter for the determination of the water vapor pressure curve

2012 ◽  
Vol 83 (7) ◽  
pp. 075114 ◽  
Author(s):  
S. Mokdad ◽  
E. Georgin ◽  
Y. Hermier ◽  
F. Sparasci ◽  
M. Himbert
Keyword(s):  
Water Vapor ◽  
Vapor Pressure ◽  
Water Vapor Pressure ◽  
Adiabatic Calorimeter ◽  
Pressure Curve ◽  
Vapor Pressure Curve

The Vapor-Pressure Curve of Helium between 4.2°K and 4.8°K

1954 ◽  
Vol 93 (1) ◽  
pp. 45-46 ◽  
Author(s):  
R. D. Worley ◽  
M. W. Zemansky ◽  
H. A. Boorse
Keyword(s):  
Vapor Pressure ◽  
Pressure Curve ◽  
Vapor Pressure Curve

Phase Behavior and Its Effects on Reactions in Liquid and Supercritical Carbon Dioxide

2004 ◽  
Author(s):  
Lynnette A. Blanchard ◽  
Gang Xu
Keyword(s):  
Carbon Dioxide ◽  
Melting Point ◽  
Vapor Pressure ◽  
Phase Behavior ◽  
Critical Point ◽  
Pressure Curve ◽  
Light Component ◽  
Vapor Pressure Curve ◽  
Solid Liquid ◽  
Liquid Vapor

Carbon dioxide, either as an expanded liquid or as a supercritical fluid, may be a viable replacement for a variety of conventional organic solvents in reaction systems. Numerous studies have shown that many reactions can be conducted in liquid or supercritical CO2 (sc CO2) and, in some cases, rates and selectivities can be achieved that are greater than those possible in normal liquid- or gas-phase reactions (other chapters in this book; Noyori, 1999; Savage et al., 1995). Nonetheless, commercial exploitation of this technology has been limited. One factor that contributes to this reluctance is the extremely complex phase behavior that can be encountered with high-pressure multicomponent systems. Even for simple binary systems, one can observe multiple fluid phases, as shown in Figure 1.1. The figure shows the pressure–temperature (PT) projection of the phase diagram of a binary system, where the vapor pressure curve of the light component (e.g., CO2) is the solid line shown at temperatures below TB. It is terminated by its critical point, which is shown as a solid circle. The sublimation curve, melting curve, and vapor pressure curve of the pure component 2 (say, a reactant that is a solid at ambient conditions) are the solid lines shown at higher temperatures on the right side of the diagram; that is, the triple point of this compound is above TE. The solid might experience a significant melting point depression when exposed to CO2 pressure [the dashed–dotted solid/liquid/vapor (SLV) line, which terminates in an upper critical end point (UCEP)]. For instance, naphthalene melts at 60.1 °C under CO2 pressure (i.e., one might observe a three-phase solid/liquid/vapor system), even though the normal melting point is 80.5 °C (McHugh and Yogan, 1984). To complicate things even further, there will be a region close to the critical point of pure CO2 where one will observe three phases as well, as indicated by the dashed–dotted SLV line that terminates at the lower critical end point (LCEP). The dotted line connecting the critical point of the light component and the LCEP is a vapor/liquid critical point locus.

Ultraviolet and infrared spectrum of C6H2 revisited and vapor pressure curve in Titan's atmosphere

2003 ◽  
Vol 51 (1) ◽  
pp. 9-17 ◽  
Author(s):  
F. Shindo ◽  
Y. Benilan ◽  
J.-C. Guillemin ◽  
P. Chaquin ◽  
A. Jolly ◽  
...  
Keyword(s):  
Infrared Spectrum ◽  
Vapor Pressure ◽  
Pressure Curve ◽  
Vapor Pressure Curve

New Method to Determine Latent Heat of Liquids by Means of Dielectric Data

1975 ◽  
Vol 97 (1) ◽  
pp. 99-103 ◽  
Author(s):  
W. Leidenfrost
Keyword(s):  
Molecular Weight ◽  
Vapor Pressure ◽  
Latent Heat ◽  
Excellent Agreement ◽  
New Method ◽  
Pressure Curve ◽  
Dielectric Data ◽  
Vapor Pressure Curve ◽  
Using Data ◽  
Specific Volumes

A new method to determine heat of vaporization by means of dielectric data is described which allows one to obtain specific volumes introduced into Clausius-Clapeyron’s equation. Isochoric observations are not needed in most cases. An instrument is described for the observation of dielectric data, vapor pressure curve, p-T relationships in superheated state and also molecular weight and polarizability. The measurements to be performed are listed. The validity of the method is checked by using data observed in a similar instrument. The latent heat obtained by the new method is in excellent agreement with literature data. The new method, therefore, can be used advantageously to determine, in not too elaborate test equipment, latent heat, and other properties easily, quickly, and reliably.

An Example of the Manipulation of Effective Vapor Pressure Curves by Thermodynamic Cycles

1988 ◽  
Vol 110 (4) ◽  
pp. 647-651 ◽  
Author(s):  
R. Radermacher
Keyword(s):  
Vapor Pressure ◽  
Rankine Cycle ◽  
Coefficient Of Performance ◽  
Working Fluid ◽  
Large Temperature ◽  
Pressure Curve ◽  
Two Stage ◽  
Fluid Mixture ◽  
Thermodynamic Cycles ◽  
Vapor Pressure Curve

The performance of a two-stage Rankine cycle employing a working fluid mixture and solution circuits has been computed with reference to heat pump applications. Its performance is compared to the single-stage version of this cycle and one operating with pure refrigerants. It is found that the two-stage cycle operates along an “effective” vapor pressure curve of very flat slope, resulting in pressure ratios that are reduced to about one third compared to conventional cycles. For large temperature differences between heat sink and source the Coefficient of Performance (COP) can be increased by up to 50 percent.

On Srinivasan’s Criterion for the Vapor Pressure Curve†

2010 ◽  
Vol 55 (10) ◽  
pp. 4244-4247 ◽  
Author(s):  
Santiago Velasco ◽  
Francisco L. Román ◽  
Juan A. White
Keyword(s):  
Vapor Pressure ◽  
Pressure Curve ◽  
Vapor Pressure Curve
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