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Charles M. Huggins

Bio: Charles M. Huggins is an academic researcher. The author has contributed to research in topics: Vapor pressure & Thermodynamic databases for pure substances. The author has an hindex of 1, co-authored 1 publications receiving 536 citations.


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Journal ArticleDOI
TL;DR: In this paper, the volumetric and thermodynamic functions correlated by Pitzer and co-workers were analyzed with improved accuracy by a modified BWR equation of state, which provides a smooth transition between the original tables of Pitzer et al. and more recent extensions to lower temperatures.
Abstract: The volumetric and thermodynamic functions correlated by Pitzer and co-workers analytically represented with improved accuracy by a modified BWR equation of state. The representation provides a smooth transition between the original tables of Pitzer et al. and more recent extensions to lower temperatures. It is in a form particularly convenient for computer use.

1,302 citations

Journal ArticleDOI
Constantine Tsonopoulos1
TL;DR: In this paper, a new correlation of second virial coefficients of both polar and nonpolar systems is presented, which uses the Pitzer-Curl correlation for non-polar compounds, but in a modified form.
Abstract: A new correlation of second virial coefficients of both polar and nonpolar systems is presented. It uses the Pitzer-Curl correlation for nonpolar compounds, but in a modified form. The second virial coefficient of nonhydrogen bonding compounds (ketones, acetaldehyde, acetonitrile, ethers) and weakly hydrogen bonding compounds (phenol) is fitted satisfactorily with only one additional parameter per compound, which is shown to be a strong function of the reduced dipole moment. Two parameters are needed for hydrogen bonding compounds (alcohols, water), but for alcohols, one parameter has been kept constant and the other expressed as a function of the reduced dipole moment. The extension of the correlation to mixtures is satisfactory, direct, and involves only one coefficient per binary.

858 citations

Journal ArticleDOI
TL;DR: In this article, an extension of the law of corresponding states that can be applied to colloidal suspensions that have widely different ranges of attractive interactions is proposed. And the reduced second virial coefficient is a convenient parameter to quantify the effective range of attraction, which can be used to estimate the relative location of the liquid and solid-fluid coexistence curves.
Abstract: We propose an extension of the law of corresponding states that can be applied to systems—such as colloidal suspensions—that have widely different ranges of attractive interactions. We argue that the “reduced” second virial coefficient is a convenient parameter to quantify the effective range of attraction. Knowledge of the pair-potential alone allows one to estimate the relative location of the liquid–vapor and solid–fluid coexistence curves.

439 citations

ReportDOI
01 Apr 1996
TL;DR: Physical property data for many of the key components used in the simulation for the ethanol from lignocellulose process are not available in the standard ASPEN PLUS property databases, so a set of consistent physical properties for all components of interest is determined.
Abstract: Physical property data for many of the key components used in the simulation for the ethanol from lignocellulose process are not available in the standard ASPEN PLUS property databases. Indeed, many of the properties necessary to successfully simulate this process are not available anywhere. In addition, inputting the available properties into each simulation is awkward and tedious, and mistakes can be easily introduced when a long list of physical property equation parameters is entered. Therefore, one must evaluate the literature, estimate properties where necessary, and determine a set of consistent physical properties for all components of interest. The components must then be entered into an in-house NREL ASPEN PLUS database so they can be called on without being retyped into each specific simulation. The first phase of this work is complete. A complete set of properties for the currently identifiable important compounds in the ethanol process is attached. With this as the starting base the authors can continue to search for and evaluate new properties or have properties measured in the laboratory and update the central database.

305 citations

Journal ArticleDOI
TL;DR: In this article, a new four-parameter cubic equation of state is presented which gives improved predictions of phase behaviour for both polar and non-polar fluids, and the effect of the number of parameters contained in the equation is discussed in detail.

216 citations