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Colonia Lindavista, Mexico

Elizalde-Solis O.,ESIQIE | Galicia-Luna L.A.,Laboratorio Of Termodinamica
Industrial and Engineering Chemistry Research | Year: 2011

The aim of this work is to present a new experimental apparatus based on the static-analytic method suitable to perform solubility measurements of solids in sub- and supercritical carbon dioxide. Mole fractions of dissolved solids are determined online via high-performance liquid chromatography. The studied binary mixtures are capsaicin in carbon dioxide from 298 to 328 K, hexadecanoic acid in carbon dioxide at 313 and 318 K, α-carotene in carbon dioxide at 298 and 313 K, and acetaminophen in carbon dioxide at 313 K. The experimental apparatus is also tested by circulating the fluid phase to measure the solubility of capsaicin in carbon dioxide at 298 K. Experimental solid solubilities in carbon dioxide are found to be in agreement with the solubility data reported in the literature. The Méndez-Santiago and Teja and the modified Chrastil models are used to correlate the experimental data. © 2010 American Chemical Society. Source


Quevedo-Nolasco R.,Laboratorio Of Termodinamica | Galicia-Luna L.A.,Laboratorio Of Termodinamica | Elizalde-Solis O.,ESIQIE
Journal of Chemical Thermodynamics | Year: 2012

Densities (p, ρ, T, x1) of two binary n-alkane systems are reported from T = (313 to 363) K in the compressed liquid phase up to 25 MPa over the whole range of composition. The binary mixtures {x1n-heptane + (1 - x1)n-decane} and {x1n-octane + (1 - x 1)n-decane} were prepared at compositions of (x1 = 0.0531, 0.2594, 0.5219, 0.777, 0.952), and (x1 = 0.0616, 0.2801, 0.5314, 0.7736, 0.9623), respectively. A measuring system based on a vibrating tube densimeter, DMA HPM from Anton Paar with data acquisition system was developed in order to obtain experimental densities. Water and nitrogen were used as reference fluids to calibrate the densimeter. Experimental methodology was checked by comparing the n-heptane and n-decane densities against multi-parameter equations proposed in the literature. Differences between both sets of data show a maximum deviation of 0.07%. Excess molar volumes, isothermal compressibility and isobaric thermal expansivity were computed from experimental densities. © 2011 Elsevier Ltd. All rights reserved. Source


Serrano-Cocoletzi V.,Laboratorio Of Termodinamica | Galicia-Luna L.A.,Laboratorio Of Termodinamica | Elizalde-Solis O.,ESIQIE
Journal of Chemical and Engineering Data | Year: 2012

In this study, experimental vapor-liquid equilibrium (VLE) behavior for two quaternary carbon dioxide + ethanol + thiophene + (pentane or nonane) systems was measured by means of a static-analytic apparatus with online sampling. The VLE data was obtained at (∼334.2 and ∼363.8) K. Carbon dioxide + ethanol was used as a solvent + cosolvent mixture prepared in a solute-free basis of 0.033 mass fraction ethanol. The solute mixture, constituted by the sulfur compound + linear alkane, was used to determine the feasibility to extract the sulfur compound in the studied range. Standard uncertainties (u) for the measured properties are estimated to be p ± 0.02 MPa, T ± 0.04 K, and x1 ± 0.0028, y1 ± 0.0015 mole fraction for these last two values. According to the results, the vapor phase is enriched with pentane compared with the sulfur compound. On the other hand, high separation factors for thiophene over nonane are obtained at low pressures. © 2012 American Chemical Society. Source


Camacho-Camacho L.E.,Laboratorio Of Termodinamica | Galicia-Luna L.A.,Laboratorio Of Termodinamica | Elizalde-Solis O.,ESIQIE
Journal of Chemical and Engineering Data | Year: 2011

Experimental vapor-liquid equilibrium (VLE) data of binary and ternary systems are reported covering all of the phase envelopes up to near the critical point. The carbon dioxide + dodecane, carbon dioxide + benzothiophene, and carbon dioxide + nonane + benzothiophene systems were studied at (318.14, 344.75, 373.23, and 417.91) K, 373.93 K, and (313.09, 343.73, and 373.74) K, respectively. The apparatus is based on the static-analytic method with an on-line ROLSI (rapid on-line sampler-injector) sampler to allow fast determination of the VLE. Standard uncertainties for the measured properties in this work were estimated to be p ± 0.01 MPa, T ± 0.03 K, liquid mole fraction xCO2 ± 0.0036, and vapor mole fraction y CO2 ± 0.0016. The experimental VLE data for carbon dioxide + dodecane were found to be in agreement with those available in the literature at 318 K. Furthermore, the corresponding results for the ternary system indicate a high selectivity of nonane in the vapor phase instead of benzothiophene. Data obtained in this work were correlated with the Peng-Robinson equation of state using the Wong-Sandler mixing rules. © 2011 American Chemical Society. Source


Quevedo-Nolasco R.,Laboratorio Of Termodinamica | De La Cruz-Hernandez L.A.,Laboratorio Of Termodinamica | Galicia-Luna L.A.,Laboratorio Of Termodinamica | Elizalde-Solis O.,ESIQIE
Journal of Chemical and Engineering Data | Year: 2011

Volumetric properties (p, ρ, T, x1) of two binary linear alkane systems are reported in the temperature range of (313 to 363) K and up to 25 MPa. Binary mixtures were prepared at compositions of (x1 = 0.1654, 0.2199, 0.5749, 0.7995, and 0.9308) for hexane (1) + octane (2) and hexane (1) + decane (2) at (x1 = 0.0456, 0.2185, 0.4968, 0.7524, and 0.8991) in mole fraction. Experimental densities were measured in a vibrating-tube densimeter, DMA HPM from Anton Paar, using water and nitrogen as reference fluids. The excess molar volumes, isobaric thermal expansivities, and isothermal compressibilities for these systems were computed from experimental data using a six-parameter modified Toscani and Szwarc equation. © 2011 American Chemical Society. Source

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