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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Evaluation of a Variation of the Differential Scanning Calorimetry Technique for Measuring Boiling Points of Binary Mixtures at Subatmospheric Pressures

Full text
Author(s):
Troni, Kelly L. [1] ; Damaceno, Daniela S. [1] ; Ceriani, Roberta [1]
Total Authors: 3
Affiliation:
[1] Univ Estadual Campinas, Fac Chem Engn, BR-13083852 Campinas, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: JOURNAL OF CHEMICAL AND ENGINEERING DATA; v. 65, n. 7, p. 3334-3343, JUL 9 2020.
Web of Science Citations: 0
Abstract

Boiling points and vapor-liquid equilibrium (VLE) data are crucial for improving modeling and process design. Therefore, considering the experimental determination of these primary thermodynamic properties, a nontraditional technique that has been under study and has shown some advantages is the differential scanning calorimetry (DSC) technique and its variations. Following a previous work focused only on pure compounds, in this work a set of experiments was performed to evaluate in a systematic way the suitability of its suggested variation of the DSC technique for binary mixtures. Its optimized condition for heating rate (24.52 K.min(-1)) and sample size (4.6 +/- 0.5) mg was used at 4.97 kPa with u(P) = 0.12 kPa for 15 different combinations of n-paraffins and/or fatty alcohols (1-alcohols) in binary mixtures (n-paraffin + n-paraffin, 1-alcohol + 1-alcohol, and n-paraffin + 1-alcohol), taking into account the difference between the boiling points (Tb) of the pure compounds at the selected pressure (7 to 63 K). Experiments were configured using the equimolar condition, and pursued effects of this difference on the measured extrapolated onset temperature, that is, the measured boiling point. For four of these mixtures other molar fractions were also tested. Estimations of the boiling points followed the appropriate thermodynamic approach. The results revealed that the optimized condition may fail in some situations for binary mixtures, and that this fail could not always be related to the difference in the boiling points of their pure compounds. Further work is necessary in this direction. (AU)

FAPESP's process: 14/21252-0 - Equilibrium and production processes of biofuels and bioproducts
Grantee:Antonio José de Almeida Meirelles
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 16/18253-0 - Phase equilibria in lipid and biofuel technologies
Grantee:Roberta Ceriani
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
FAPESP's process: 13/12735-5 - Vapor liquid equilibria and liquid liquid equilibria in the oil/fat and biodiesel industries: experimental data, modelling and simulation
Grantee:Roberta Ceriani
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants