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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.

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.

Velazquez J.C.,ESIQIE | Caleyo F.,ESIQIE | Valor A.,University of Habana | Hallen J.M.,ESIQIE
Corrosion | Year: 2010

Recently, the authors proposed a new predictive model for pitting corrosion in underground pipelines. The model is based on field measurements of maximum pitting corrosion depth together with local soil and pipeline characteristics. The pitting corrosion data collection was conducted over a three-year period, for onshore buried pipelines operating in southern Mexico. This technical note contains a detailed description of the results of the field measurements, indicating the data entries classified as outlier observations and the textural soil class ascribed to each data entry. © 2010, NACE International.

Herrera D.A.,ESIQIE | Velazquez G.,ESIQIE | De J. Morales Ramirez A.,Research Center novacion Tecnologica Ciitec Ipn Cerrada Of Cecato S N
Journal of ASTM International | Year: 2010

Fatigue crack propagation (FCP) rates in submerged arc welding (SAW) seam welds of 1524 steel (API 5L X42) pipe were measured by using an arc-shaped bend specimen with the same radius of curvature of the body of the pipe so the material did not have to be cold worked to get a flat shape nor extensively machined. The test direction was girth radial and the stress intensity factor (K) function was calibrated for this type of nonstandard specimen. The FCP tests were carried out in air at room temperature, testing the three zones: The base metal, the deposited metal, and the heat affected zone (HAZ).A fractographic analysis was done to analyze the role of the microstructure in the FCP in the three zones. It was found that the zone of greater resistance to FCP was the base metal, whereas the deposited metal showed the least resistance to crack propagation. FCP in the deposited metal and the HAZ behaved according to the Paris law, unlike the base metal, which showed a high data dispersion. The behavior in the base metal was attributed to the propagation of the crack in the transverse direction of the preferential alignment of the microstructure, while the deposited metal and the HAZ had a more homogeneous microstructure. Copyright © 2010 by ASTM International.

Carrera R.,ESIQIE | Vazquez A.L.,ESIQIE | Castillo S.,ESIQIE | Castillo S.,Mexican Institute of Petroleum | Arce E.,ESIQIE
Materials Science Forum | Year: 2011

Nowadays, nanostructured semiconductor materials offer promising opportunities for a new generation of materials such as TiO2 nanoparticles with improved properties for their application in the environmental catalysis field. It is well known that the phocatalytic activity of the TiO2 nanoparticles is strongly dependent on the surface area, crystal size, phase composition and synthesis method. Thus, the preparation conditions clearly affect the photocatalytic activity of the TiO2 nanoparticles. This work deals with the study of the structure of TiO 2 nanoparticles that were synthesized by the sol-gel method (using isopropanol as solvent), and calcined at 200 and 500°C. The obtained samples were characterized by the XRD-Rietveld refinement, BET and TEM techniques; and tested in the photodecomposition of acetaldehyde. The evaluations were carried out at room temperature by using CH3CHO (300 ppmv), O2 (2.0 %) in helium balance in a quartz glass photoreactor (gas phase) with a 365-UV light lamp. According to the results, the sample that presented the highest activity in the photocatalytic oxidation of acetaldehyde (96.4%) was the one annealed at 200 °C. This sample showed the following proportion of phases: anatase (62.88%) with a tetragonal structure (a=0.3790926, b=0.3790926, c=0.9495732) nm; and b) brookite (37.12%) with an orthorhombic structure (a=0.9167624, b=0.5416461, c=0.5210546) nm. The surface area was 189 m 2/g and the average crystal size was 7.03 nm. From the results, it can be seen that this material showed high activity in the photocatalytic degradation of acetaldehyde because of: the presence of a mixture of the anatase (higher proportion) and brookite phases, nanometric crystal size and high surface area obtained in this TiO2 material. According to the aforementioned, this material can be considered as a good option for the decomposition of acetaldehyde and other volatile organic compounds (VOCs) in confined spaces. © (2011) Trans Tech Publications, Switzerland.

Teran G.,ESIQIE | Capula-Colindres S.,National Polytechnic Institute of Mexico | Angeles-Herrera D.,Mexican Institute of Petroleum | Velazquez J.C.,ESIQIE | Fernandez-Cueto M.J.,Tuxtepec Institute of Technology
Engineering Fracture Mechanics | Year: 2016

This work presents, for the first time, and estimation of fracture toughness KIC correlations from Charpy V-notch (CVN) impact test data extracted from T-welded connections repaired with rectangular grinding and filled by wet welding. To obtain KIC values, equations based on the yield stress (σYS) of the wet welding beads were used. The estimated KIC data decreased with increasing water depth. These two characteristics (porosity and microstructures for low carbon steels) did not improve the mechanical properties, such as Charpy impact and KIC values. © 2015 Elsevier Ltd.

Elizalde-Solis O.,E.S.I.Q.I.E. | 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.

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.

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.

Garcia-Cordova T.,Mexican Institute of Petroleum | Justo-Garcia D.N.,ESIQIE | Garcia-Flores B.E.,Mexican Institute of Petroleum | Garcia-Sanchez F.,Mexican Institute of Petroleum
Journal of Chemical and Engineering Data | Year: 2011

A static-analytical apparatus with visual sapphire windows and pneumatic capillary samplers has been used to obtain new vapor-liquid equilibrium data for the N2 + C12H26 system over the temperature range from (344 to 593) K and at pressures up to 60 MPa. Equilibrium phase compositions and vapor-liquid equilibrium ratios are reported. All of the measured vapor-liquid equilibrium data were subject to a thermodynamic consistency test of high-pressure vapor-liquid equilibrium data involving the calculation of the vapor-phase composition from the isothermal pressure liquid phase composition data. The consistency test showed that most of the data are thermodynamically consistent. The new results were compared with solubility data reported by other authors. The comparison showed that the vapor-liquid equilibrium data obtained in this study are in good agreement with those reported in the literature. The experimental data were modeled with the PR (Peng-Robinson) and PC-SAFT (perturbed-chain statistical associating fluid theory) equations of state by using one-fluid mixing rules and a single temperature-independent interaction parameter. Results of the modeling indicated that the PC-SAFT equation of state represents better the measured data of the N2 + C12H26 system over the whole temperature, pressure, and composition range studied. © 2011 American Chemical Society.

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