Paolo Alessi - Academia.edu (original) (raw)

Papers by Paolo Alessi

Research paper thumbnail of Measurements, correlation and prediction of Henry's constants of light alkanes in model heavy hydrocarbons and petroleum fractions

Fluid Phase Equilibria, 1993

Research paper thumbnail of Vapor liquid equilibrium data for systems containing morpholine

Fluid Phase Equilibria, 1990

Research paper thumbnail of Activity coefficients of hydrocarbons in phthalates

Journal of Chromatography A, 1975

Research paper thumbnail of Excess volumes of binary mixtures containing morpholine

Thermochimica Acta, 1990

ABSTRACT The results of an experimental investigation of five binary mixtures of morpholine with ... more ABSTRACT The results of an experimental investigation of five binary mixtures of morpholine with water and alcohols are reported. Data from volumetric measurements (T and x) are used to compute excess volumes (VE) and partial molar volumes at infinite dilution. The VE data are correlated with Redlich-Kister polynomials.

Research paper thumbnail of Correlation of hydrocarbon activity coefficients with solubility parameters for phthalate esters

Journal of Chromatography A, 1975

Research paper thumbnail of Plasticization of polymers with supercritical carbon dioxide: Experimental determination of glass-transition temperatures

Journal of Applied Polymer Science, 2003

High-pressure partition chromatography, a modification of the inverse gas chromatography techniqu... more High-pressure partition chromatography, a modification of the inverse gas chromatography technique, is presented as suitable technique for the study of the plasticization effect of carbon dioxide on the following polymers: poly(methyl methacrylate), polystyrene, and bisphenol A–polycarbonate. Polymers in the presence of a compressed gas or a supercritical fluid become plasticized; this means that their glass-transition temperatures (Tg's) can be lowered by 10s of degrees, which causes changes in their mechanical and physical properties. CO2-induced plasticization has an important impact on many polymer processing operations in which the Tg depressions of the polymers can be evaluated. The experimental results are discussed and compared with data available from literature for each polymer we considered. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 2189–2193, 2003

Research paper thumbnail of Prediction of finite concentration behavior from infinite dilution equilibrium data

Fluid Phase Equilibria, 1983

ABSTRACT

Research paper thumbnail of Solubility of Chlorinated Pesticides in Supercritical Carbon Dioxide

Journal of Chemical and Engineering Data, 1995

Research paper thumbnail of Modelling solubility of solids in supercritical fluids using fusion properties

Fluid Phase Equilibria, 1999

Research paper thumbnail of Prediction of solubility in heavy ends by means of PHCT

Fluid Phase Equilibria, 1989

Abstract The paper deals with the possibility of predicting phase behavior of oil solutions in li... more Abstract The paper deals with the possibility of predicting phase behavior of oil solutions in light hydrocarbon solvents. Such mixtures contain very many components: one or two well defined light alkanes (solvents) and one poorly defined continuous oil. Having ...

Research paper thumbnail of UNIFAC and infinite dilution activity coefficients

Canadian Journal of Chemical Engineering, 1982

This paper deals with the possibility of estimating UNIFAC parameters from infinite dilution acti... more This paper deals with the possibility of estimating UNIFAC parameters from infinite dilution activity coefficients. Such activity coefficients can be obtained from gas chromatographic measurements (GLC).In some cases the original UNIFAC equations do not represent very well the variations of the activity coefficients with the concentration in the very dilute regions. It is then not possible to estimate reliable parameters from infinite dilution activity coefficients alone.It is shown that a recent modification of the combinatorial part of the UNIFAC equations allows for the estimation of UNIFAC parameters from infinite dilution activity coefficients for alkane—-ketone, alkane—-alcohol, and other mixtures.On traite, dans le présent travail, de la possibilité d'évaluer les paramètres d'UNIFAC à partir des coefficients d'activité à dilution infinie. Ces coefficients peuvent ětre obtenus à partir de mesures par chromatographic en phase gazeuse (GLC).Dans certains cas, les équations originales d'UNIFAC ne représentent pas très bien les variations des coefficients avec la concentration dans les régions à très forte dilution, il est alors impossible d'évaluer des paramètres fiables à partir des seuls coefficients d'activité à dilution infinie.On montre qu'une modification de la partie combinatoire des équations d'UNIFAC permet d'évaluer les paramètres d'UNIFAC, à partir des coefficients d'activité à dilution infinie, pour les mélanges alcane—-cétone, alcane-alcool et quelques autres mélanges.

Research paper thumbnail of Activity coefficients at infinite dilution by gas-liquid chromatography. 1. Hydrocarbons and n-chloroparaffins in organic solvents

Journal of Chemical and Engineering Data, 1982

Research paper thumbnail of Solubility of Anti-Inflammatory Drugs in Supercritical Carbon Dioxide

Journal of Chemical and Engineering Data, 1996

Research paper thumbnail of Polymer Plasticization Using Supercritical Carbon Dioxide: Experiment and Modeling

Industrial & Engineering Chemistry Research, 2003

... Macromolecules1992, 29, 6119. [ACS Full Text ACS Full Text ]. (9) Kazarian, SG; Brantley, NH;... more ... Macromolecules1992, 29, 6119. [ACS Full Text ACS Full Text ]. (9) Kazarian, SG; Brantley, NH; West, BL; Vincent, MF; Eckert, CA In situ spectroscopy of polymers subjected to supercritical CO 2 : plasticization and dye impregnation. Appl. Spectrosc. 1997, 51, 491. ...

Research paper thumbnail of Thermodynamic Properties of Mixtures Containing Precursors of Vitamin B5

Journal of Chemical and Engineering Data, 2003

Research paper thumbnail of Supercritical antisolvent precipitation of atenolol: The influence of the organic solvent and of the processing approach

Journal of Supercritical Fluids, 2006

Research paper thumbnail of Polarity of phthalate esters in gas chromatography

Journal of Chromatography A, 1977

Research paper thumbnail of Significance of dilute regions

Fluid Phase Equilibria, 1991

Research paper thumbnail of Supercritical fluids chromatography for impregnation optimization

Journal of Supercritical Fluids, 2000

Supercritical impregnation technique of polymeric matrix is going to have a very high interest in... more Supercritical impregnation technique of polymeric matrix is going to have a very high interest in the pharmaceutical field. The possibility to obtain a final drug release product totally uncontaminated by organic solvents is a noticeable progress for the pharmaceutical factories. Two main steps are involved in the impregnation studies, the knowledge of the behavior of the drug/supercritical medium system, and

Research paper thumbnail of Evaluation of solvent properties ☆A comparison of esters of 2-ethylhexanol

Journal of Chromatography A, 1977

Research paper thumbnail of Measurements, correlation and prediction of Henry's constants of light alkanes in model heavy hydrocarbons and petroleum fractions

Fluid Phase Equilibria, 1993

Research paper thumbnail of Vapor liquid equilibrium data for systems containing morpholine

Fluid Phase Equilibria, 1990

Research paper thumbnail of Activity coefficients of hydrocarbons in phthalates

Journal of Chromatography A, 1975

Research paper thumbnail of Excess volumes of binary mixtures containing morpholine

Thermochimica Acta, 1990

ABSTRACT The results of an experimental investigation of five binary mixtures of morpholine with ... more ABSTRACT The results of an experimental investigation of five binary mixtures of morpholine with water and alcohols are reported. Data from volumetric measurements (T and x) are used to compute excess volumes (VE) and partial molar volumes at infinite dilution. The VE data are correlated with Redlich-Kister polynomials.

Research paper thumbnail of Correlation of hydrocarbon activity coefficients with solubility parameters for phthalate esters

Journal of Chromatography A, 1975

Research paper thumbnail of Plasticization of polymers with supercritical carbon dioxide: Experimental determination of glass-transition temperatures

Journal of Applied Polymer Science, 2003

High-pressure partition chromatography, a modification of the inverse gas chromatography techniqu... more High-pressure partition chromatography, a modification of the inverse gas chromatography technique, is presented as suitable technique for the study of the plasticization effect of carbon dioxide on the following polymers: poly(methyl methacrylate), polystyrene, and bisphenol A–polycarbonate. Polymers in the presence of a compressed gas or a supercritical fluid become plasticized; this means that their glass-transition temperatures (Tg's) can be lowered by 10s of degrees, which causes changes in their mechanical and physical properties. CO2-induced plasticization has an important impact on many polymer processing operations in which the Tg depressions of the polymers can be evaluated. The experimental results are discussed and compared with data available from literature for each polymer we considered. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 2189–2193, 2003

Research paper thumbnail of Prediction of finite concentration behavior from infinite dilution equilibrium data

Fluid Phase Equilibria, 1983

ABSTRACT

Research paper thumbnail of Solubility of Chlorinated Pesticides in Supercritical Carbon Dioxide

Journal of Chemical and Engineering Data, 1995

Research paper thumbnail of Modelling solubility of solids in supercritical fluids using fusion properties

Fluid Phase Equilibria, 1999

Research paper thumbnail of Prediction of solubility in heavy ends by means of PHCT

Fluid Phase Equilibria, 1989

Abstract The paper deals with the possibility of predicting phase behavior of oil solutions in li... more Abstract The paper deals with the possibility of predicting phase behavior of oil solutions in light hydrocarbon solvents. Such mixtures contain very many components: one or two well defined light alkanes (solvents) and one poorly defined continuous oil. Having ...

Research paper thumbnail of UNIFAC and infinite dilution activity coefficients

Canadian Journal of Chemical Engineering, 1982

This paper deals with the possibility of estimating UNIFAC parameters from infinite dilution acti... more This paper deals with the possibility of estimating UNIFAC parameters from infinite dilution activity coefficients. Such activity coefficients can be obtained from gas chromatographic measurements (GLC).In some cases the original UNIFAC equations do not represent very well the variations of the activity coefficients with the concentration in the very dilute regions. It is then not possible to estimate reliable parameters from infinite dilution activity coefficients alone.It is shown that a recent modification of the combinatorial part of the UNIFAC equations allows for the estimation of UNIFAC parameters from infinite dilution activity coefficients for alkane—-ketone, alkane—-alcohol, and other mixtures.On traite, dans le présent travail, de la possibilité d'évaluer les paramètres d'UNIFAC à partir des coefficients d'activité à dilution infinie. Ces coefficients peuvent ětre obtenus à partir de mesures par chromatographic en phase gazeuse (GLC).Dans certains cas, les équations originales d'UNIFAC ne représentent pas très bien les variations des coefficients avec la concentration dans les régions à très forte dilution, il est alors impossible d'évaluer des paramètres fiables à partir des seuls coefficients d'activité à dilution infinie.On montre qu'une modification de la partie combinatoire des équations d'UNIFAC permet d'évaluer les paramètres d'UNIFAC, à partir des coefficients d'activité à dilution infinie, pour les mélanges alcane—-cétone, alcane-alcool et quelques autres mélanges.

Research paper thumbnail of Activity coefficients at infinite dilution by gas-liquid chromatography. 1. Hydrocarbons and n-chloroparaffins in organic solvents

Journal of Chemical and Engineering Data, 1982

Research paper thumbnail of Solubility of Anti-Inflammatory Drugs in Supercritical Carbon Dioxide

Journal of Chemical and Engineering Data, 1996

Research paper thumbnail of Polymer Plasticization Using Supercritical Carbon Dioxide: Experiment and Modeling

Industrial & Engineering Chemistry Research, 2003

... Macromolecules1992, 29, 6119. [ACS Full Text ACS Full Text ]. (9) Kazarian, SG; Brantley, NH;... more ... Macromolecules1992, 29, 6119. [ACS Full Text ACS Full Text ]. (9) Kazarian, SG; Brantley, NH; West, BL; Vincent, MF; Eckert, CA In situ spectroscopy of polymers subjected to supercritical CO 2 : plasticization and dye impregnation. Appl. Spectrosc. 1997, 51, 491. ...

Research paper thumbnail of Thermodynamic Properties of Mixtures Containing Precursors of Vitamin B5

Journal of Chemical and Engineering Data, 2003

Research paper thumbnail of Supercritical antisolvent precipitation of atenolol: The influence of the organic solvent and of the processing approach

Journal of Supercritical Fluids, 2006

Research paper thumbnail of Polarity of phthalate esters in gas chromatography

Journal of Chromatography A, 1977

Research paper thumbnail of Significance of dilute regions

Fluid Phase Equilibria, 1991

Research paper thumbnail of Supercritical fluids chromatography for impregnation optimization

Journal of Supercritical Fluids, 2000

Supercritical impregnation technique of polymeric matrix is going to have a very high interest in... more Supercritical impregnation technique of polymeric matrix is going to have a very high interest in the pharmaceutical field. The possibility to obtain a final drug release product totally uncontaminated by organic solvents is a noticeable progress for the pharmaceutical factories. Two main steps are involved in the impregnation studies, the knowledge of the behavior of the drug/supercritical medium system, and

Research paper thumbnail of Evaluation of solvent properties ☆A comparison of esters of 2-ethylhexanol

Journal of Chromatography A, 1977