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Alberto J Marchi - One of the best experts on this subject based on the ideXlab platform.
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liquid phase dehydration of 1 phenylethanol over hzsm 5 kinetic modeling
Catalysis Communications, 2009Co-Authors: Nicolas M Bertero, Carlos R. Apesteguía, Alberto J MarchiAbstract:Abstract The liquid-phase dehydration of 1-phenylethanol over HZSM-5 zeolite (Si/Al = 20), at 353–373 K and using cyclohexane as solvent, was studied. Varying initial reactant concentration, a negative order respect to 1-phenylethanol was determined. In all cases, HZSM-5 resulted highly selective to styrene. Experimental data were fitted using LHHW-like kinetic models. Both physical and statistical criteria were applied to discriminate the best heterogeneous kinetic model. The most satisfactory fitting was obtained assuming that styrene is formed from 1-phenylethanol interacting simultaneously with two active sites. This mechanism explains the negative order respect to 1-phenylethanol.
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liquid phase dehydration of 1 phenylethanol over mordenite like zeolites influence of si al ratio
Catalysis Communications, 2008Co-Authors: Nicolas M Bertero, Carlos R. Apesteguía, Alberto J MarchiAbstract:Abstract The liquid-phase dehydration of 1-phenylethanol over mordenite-like zeolites, with different Si/Al ratios, was studied at 363 K using cyclohexane as solvent. It was determined that catalyst activity and selectivity greatly depended on the Si/Al ratio. The non-dealuminated mordenite showed the lowest activity, dehydrating 1-phenylethanol mainly to α-methylbenzyl ether via an intermolecular mechanism. Instead, intramolecular dehydration of 1-phenylethanol into styrene was mainly observed over dealuminated samples. Changes in catalytic performance with Si/Al ratio was explained on the basis of: (1) acid site density; (2) relative amount of strong acid sites respect to weak ones; (3) accessibility to strong acid sites.
Gloria Villora - One of the best experts on this subject based on the ideXlab platform.
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ternary liquid liquid equilibria for mixtures of an ionic liquid n hexane an organic compound involved in the kinetic resolution of rac 1 phenyl ethanol rac 1 phenyl ethanol vinyl propionate rac 1 phenylethyl propionate or propionic acid at 298 2 k a
Fluid Phase Equilibria, 2008Co-Authors: F J Hernandezfernandez, Antonia Perez De Los Rios, Demetrio Gomez, Manuel Rubio, F Tomasalonso, Gloria VilloraAbstract:Abstract The liquid–liquid equilibrium of 16 ternary systems containing an ionic liquid + n-hexane + an organic compound involved in the racemic resolution of rac-1-phenylethanol (rac-1-phenylethanol, vinyl propionate, 1-phenylethyl propionate or propionic acid) at 298.2 K and atmospheric pressure have been measured. The ionic liquids used were (i) 1-butyl-3-methylimidazolium hexafluorophosphate, [bmim+][PF6−]; (ii) 1-butyl-3-methylimidazolium tetrafluoroborate, [bmim+][BF4−]; (iii) 1-ethyl-3-methylimidazolium tosilate, [emim+][TOS−] and (iv) 1-butyl-3-methyl imidazolium ethylenglykolmonomethylethersulfate, [bmim+][MDEGSO4−]. The binodal curves and the tie line compositions of the conjugate solutions were obtained by means of refractive index (ionic liquid rich phase) and by gas cromatography (hexane rich phase) to determine their potential for selectively extracting organic compounds from an ionic liquid reaction mixture. The tie lines were correlated by using the NTRL equation, which provides good correlation of the experimental data.
Jose L Iborra - One of the best experts on this subject based on the ideXlab platform.
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continuous green biocatalytic processes using ionic liquids and supercritical carbon dioxide
Chemical Communications, 2002Co-Authors: Pedro Lozano, Teresa De Diego, Daniel Carrie, Michel Vaultier, Jose L IborraAbstract:Soluble Candida antarctica lipase B dissolved in ionic liquids showed good synthetic activity, enantioselectivity and operational stability in supercritical carbon dioxide for both butyl butyrate synthesis and the kinetic resolution of 1-phenylethanol processes by transesterification.
José Carlos . Cobos - One of the best experts on this subject based on the ideXlab platform.
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Liquid−Liquid Equilibria for 2‑Phenylethan-1-ol + Alkane Systems
American Chemical Society, 2018Co-Authors: Alonso Tristán Cristina, Juan Antonio . González, García De La Fuente, Isaías ., Luis Felipe . Sanz, José Carlos . CobosAbstract:The liquid–liquid equilibrium (LLE) curves for 2-phenylethan-1-ol (2-phenylethanol, 2PhEtOH) + octane, + decane, + dodecane, + tetradecane or + 2,2,4-trimethylpentane have been determined by a method of turbidimetry using a laser scattering technique. Experimental results reveal that the systems are characterized by an upper critical solution temperature (UCST), which increases linearly with the number of C atoms of the n-alkane. In addition, the LLE curves have a rather horizontal top and become skewed to higher mole fractions of the n-alkane, when its size increases. For a given n-alkane, UCST decreases as follows: phenol > phenylmethanol > 2-PhEtOH, indicating that dipolar interactions decrease in the same sequence. This has been ascribed to a weakening in the same order of the proximity effects between the phenyl and OH groups of the aromatic alkanols. DISQUAC interaction parameters for OH/aliphatic and OH/aromatic contacts in the investigated systems are reported. Phenol, or phenylmethanol or 2-PhEtOH, + n-alkane mixtures only differ by the first dispersive Gibbs energy interaction parameter for the (OH/aliphatic) contactJunta de Castilla y León, under Project BU034U16 F
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thermodynamics of mixtures containing aromatic alcohols 1 liquid liquid equilibria for phenylmethanol alkane systems
Journal of Chemical & Engineering Data, 2012Co-Authors: Juan Antonio . González, Cristina Alonsotristan, Isaias Garcia De La Fuente, José Carlos . CobosAbstract:The liquid–liquid equilibrium (LLE) curves for (phenylmethanol + CH3(CH2)nCH3) mixtures (n = 5, 6, 8, 10, 12) have been obtained by the critical opalescence method using a laser scattering technique. All of the systems show an upper critical solution temperature (UCST). In addition, the LLE curves have a rather horizontal top, and their symmetry depends on the alkane size. The UCST increases almost linearly with n. For systems including a given alkane and phenol or phenylmethanol, the UCST is much higher than that of the corresponding mixtures with hexan-1-ol or heptan-1-ol. This reveals that dipolar interactions are stronger in solutions with aromatic alcohols. Preliminary DISQUAC interaction parameters for OH/aliphatic contacts in the investigated systems were obtained. It is remarkable that the coordinates of the critical points of (phenol or phenylmethanol + alkane) mixtures can be described using the same quasichemical interaction parameters for the OH/aliphatic and OH/aromatic contacts.
Armando J. L. Pombeiro - One of the best experts on this subject based on the ideXlab platform.
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1d copper ii aroylhydrazone coordination polymers magnetic properties and microwave assisted oxidation of a secondary alcohol
Frontiers in chemistry, 2020Co-Authors: Manas Sutradhar, Elisabete C. B. A. Alegria, Fatima Guedes M C Da Silva, Tannistha Roy Barman, Armando J. L. PombeiroAbstract:The 1D Cu(II) coordination polymers [Cu3(L(1))(NO3)4(H2O)2]n (1) and [Cu2(H2L(2))(NO3)(H2O)2]n(NO3)n (2) have been synthesized using the aroylhyrazone Schiff bases N' (1),N' (2)-bis(pyridin-2-ylmethylene)oxalohydrazide (H2L(1)) and N' (1),N' (3)-bis(2-hydroxybenzylidene)malonohydrazide (H4L(2)), respectively. They have been characterized by elemental analysis, infrared (IR) spectroscopy, UV-Vis spectroscopy, electrospray ionization mass spectrometry (ESI-MS), single crystal X-ray diffraction and variable temperature magnetic susceptibility measurements (for 2). The ligand (L(1))(2-) coordinates in the iminol form in 1, whereas the amide coordination is observed for (H2L(2))(2-) in 2. Either the ligand bridge or the nitrate bridge in 2 mediates weak antiferromagnetic coupling. The catalytic performance of 1 and 2 has been investigated toward the solvent-free microwave-assisted oxidation of a secondary alcohol (1-phenylethanol used as model substrate). At 120 degrees C and in the presence of the nitroxyl radical 2,2,6,6-tetramethylpiperydil-1-oxyl (TEMPO), the complete conversion of 1-phenylethanol into acetophenone occurs with TOFs up to 1,200 h(-1).
