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Miguel A Villamanan - One of the best experts on this subject based on the ideXlab platform.
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excess enthalpies of binary and ternary mixtures containing tert Amyl methyl ether tame tert Amyl Alcohol taoh and hexane at 298 15 and 313 15 k
Fluid Phase Equilibria, 2004Co-Authors: Cristina Alonso, Cesar R Chamorro, Jose J Segovia, Maria C Martin, Eduardo A Montero, Miguel A VillamananAbstract:Abstract Experimental excess enthalpies of the ternary system tert -Amyl methyl ether (TAME)+ tert -Amyl Alcohol (TAOH)+hexane and the corresponding binary subsystems at 313.15 K are reported. Also the systems TAME + TAOH and TAOH + hexane have been measured at 298.15 K. A quasi-isothermal flow calorimeter has been modified and tested to make the measurements. The experimental data have been fitted using a polynomial equation for binary and ternary systems. The values of the standard deviation indicate the agreement between the experimental results and the fitted ones. Positive experimental excess enthalpies were obtained for all compositions of the ternary mixture investigated, which are larger than for the binary subsystems. Temperature increase from 298.15 to 313.15 K enhances endothermic effect in the binary subsystems, TAME + TAOH and TAOH + hexane, studied here. Excess Gibbs energy data published previously and excess enthalpies have been used for calculating the excess entropy of the binary and ternary systems at 313.15 K.
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vapour liquid equilibrium of octane enhancing additives in gasolines 2 total pressure data and ge for binary and ternary mixtures containing tert Amylmethyl ether tame tert Amyl Alcohol taoh and n hexane
Fluid Phase Equilibria, 2001Co-Authors: Cristina Alonso, Cesar R Chamorro, Jose J Segovia, Maria C Martin, Eduardo A Montero, Miguel A VillamananAbstract:Abstract Vapour–liquid equilibria of the ternary system (tert-Amylmethyl ether (TAME)+tert-Amyl Alcohol (TAOH)+n-hexane) and for their constituent binary systems have been measured at 313.15 K. Data reduction by Barker’s method provides correlations for gE using the Margules equation for the binary systems and the Wohl expansion for the ternary system. Wilson, NRTL and UNIQUAC models have been applied successfully to both the binary and the ternary systems. Moreover, we compare the experimental results for these binary mixtures to the prediction of the UNIFAC (Dortmund) model. Experimental results have been compared to predictions for the ternary system obtained from the Wilson, NRTL, UNIQUAC and UNIFAC models. The presence of azeotropes in the binary systems has been studied.
Shigeo Goto - One of the best experts on this subject based on the ideXlab platform.
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reactive distillation pervaporation hybrid column for tert Amyl Alcohol etherification with ethanol
Chemical Engineering Science, 2003Co-Authors: Farid Aiouache, Shigeo GotoAbstract:The etherification of tert-Amyl Alcohol with ethanol was carried out in a reactive distillation column inserted by a zeolite NaA membrane tube. Experimental tests were carried out in both of a pervaporation module and a reactive distillation column. Under suitable conditions, the pervaporation tests have shown higher than 99.9% H2O mole fraction in the permeate. The design by the residue curve maps has shown the alleviation of azeotropes of H2O-reaction components mixtures under pervaporation. The experimental study at standard conditions has shown a gain of 10% in tert-Amyl ethyl ether (TAEE) yield when the zeolite membrane tube was inserted inside the distillation column. Further improvements in TAEE yield were realized when the feed location was separated and the time factor or the reflux ratios was increased. (C) 2003 Elsevier Science Ltd. All rights reserved.
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sorption effect on kinetics of etherification of tert Amyl Alcohol and ethanol
Chemical Engineering Science, 2003Co-Authors: Farid Aiouache, Shigeo GotoAbstract:The kinetics of the etherification of tert-Amyl Alcohol with ethanol, catalysed by a strong ion-exchange resin, Amberlyst 15, has been studied in a batch reactor at temperatures between 323 and 353 K and at a pressure of 0.8 MPa. The kinetics was described by a coupled sorption-reaction model. Flory-Huggins (F-H) model was used to predict the solubility of reaction components in the resin phase at 278 K (non-reactive conditions). Both sorption interaction parameters of F-H model and kinetic constants were determined by non-linear least-squares method. Langmuir-Hinshelwood (L-H) and power law (PL) kinetic models were compared with the experimental data. Although both the models were found to be equally successful, L-H model has shown a slightly better representation than PL model. (C) 2003 Elsevier Science Ltd. All rights reserved.
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kinetics of liquid phase synthesis of tert Amyl methyl ether from tert Amyl Alcohol and methanol catalyzed by ion exchange resin
International Journal of Chemical Kinetics, 1998Co-Authors: Bolun Yang, Madoka Maeda, Shigeo GotoAbstract:Synthesis of tert-Amyl methyl ether (TAME) from methanol (MeOH) and tert-Amyl Alcohol (TAA) in the liquid phase was studied by using an ion exchange resin, Amberlyst15 (A15) in the H+ form. Experiments were carried out in a stirred batch reactor under atmospheric pressure. The effects of catalyst size, agitation speed, temperatures, feed ratio and water on the reaction rate were investigated. Both of intraparticle and external diffusion effects could be neglected in this system. The dehydration of TAA could be decreased by increasing the ratio of MeOH/TAA and the reaction rates were greatly inhibited by water. A kinetic model which considered the inhibition of water was proposed. The experimental results agreed well with the model. © 1998 John Wiley & Sons, Inc. Int J Chem Kinet: 30: 137–143, 1998.
Cristina Alonso - One of the best experts on this subject based on the ideXlab platform.
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excess enthalpies of binary and ternary mixtures containing tert Amyl methyl ether tame tert Amyl Alcohol taoh and hexane at 298 15 and 313 15 k
Fluid Phase Equilibria, 2004Co-Authors: Cristina Alonso, Cesar R Chamorro, Jose J Segovia, Maria C Martin, Eduardo A Montero, Miguel A VillamananAbstract:Abstract Experimental excess enthalpies of the ternary system tert -Amyl methyl ether (TAME)+ tert -Amyl Alcohol (TAOH)+hexane and the corresponding binary subsystems at 313.15 K are reported. Also the systems TAME + TAOH and TAOH + hexane have been measured at 298.15 K. A quasi-isothermal flow calorimeter has been modified and tested to make the measurements. The experimental data have been fitted using a polynomial equation for binary and ternary systems. The values of the standard deviation indicate the agreement between the experimental results and the fitted ones. Positive experimental excess enthalpies were obtained for all compositions of the ternary mixture investigated, which are larger than for the binary subsystems. Temperature increase from 298.15 to 313.15 K enhances endothermic effect in the binary subsystems, TAME + TAOH and TAOH + hexane, studied here. Excess Gibbs energy data published previously and excess enthalpies have been used for calculating the excess entropy of the binary and ternary systems at 313.15 K.
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vapour liquid equilibrium of octane enhancing additives in gasolines 2 total pressure data and ge for binary and ternary mixtures containing tert Amylmethyl ether tame tert Amyl Alcohol taoh and n hexane
Fluid Phase Equilibria, 2001Co-Authors: Cristina Alonso, Cesar R Chamorro, Jose J Segovia, Maria C Martin, Eduardo A Montero, Miguel A VillamananAbstract:Abstract Vapour–liquid equilibria of the ternary system (tert-Amylmethyl ether (TAME)+tert-Amyl Alcohol (TAOH)+n-hexane) and for their constituent binary systems have been measured at 313.15 K. Data reduction by Barker’s method provides correlations for gE using the Margules equation for the binary systems and the Wohl expansion for the ternary system. Wilson, NRTL and UNIQUAC models have been applied successfully to both the binary and the ternary systems. Moreover, we compare the experimental results for these binary mixtures to the prediction of the UNIFAC (Dortmund) model. Experimental results have been compared to predictions for the ternary system obtained from the Wilson, NRTL, UNIQUAC and UNIFAC models. The presence of azeotropes in the binary systems has been studied.
Maria Antosik - One of the best experts on this subject based on the ideXlab platform.
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total pressure measurements of binary mixtures containing tert Amyl methyl ether and tert Amyl Alcohol
Journal of Chemical & Engineering Data, 1995Co-Authors: Stefan Semar, Stanley I Sandler, Maria AntosikAbstract:Vapor-liquid equilibrium data are needed for the reformulation of gasoline to meet Federal Clear Air Act standards. Oxygenates, such as ethers and Alcohols, are known to reduce Co emissions from motor vehicles, and ethers are used as a substitute for aromatics in gasoline to improve the octane rating. The vapor pressure of pure tert-Amyl methyl ether (TAME) was measured together with isothermal P-x data for mixtures of pentane + TAME and pentane + tert-Amyl Alcohol (TAOH) at temperatures between 70 and 110 C. Also, activity coefficients at infinite dilution for the binary mixtures of TAME + TAOH were obtained in the 90--120 C temperature range. The P-T-x data were correlated using the Peng-Robinson equation of state separately with the van der Waals and Wong-Sandler mixing rules.
Ganapati D Yadav - One of the best experts on this subject based on the ideXlab platform.
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novelties of a superacidic mesoporous catalyst udcat 5 in alkylation of phenol with tert Amyl Alcohol
Applied Catalysis A-general, 2006Co-Authors: Ganapati D Yadav, Ganesh S PathreAbstract:Alkylation of phenol is industrially important and several catalytic processes are developed. In the current work, the efficacies of several novel solid superacids designated as UDCaT-4, -5 and -6, and of sulphated zirconia were studied in liquid phase alkylation of phenol with tert-Amyl Alcohol. UDCaT-4, -5 and -6 are mesoporic superacids. The activity was found to be in order UDCaT-5 > UDCaT-6 > UDCaT-4 > sulphated zirconia. The high sulphur content present in UDCaT-5 was found to be responsible for the greater activity at 120 °C. The formation of products is correlated with the acidity of the catalyst. The conversion of tert-Amyl Alcohol and the selectivity for C-alkylated product were 96 and 85%, respectively, under optimum reaction conditions. The reaction was carried out without solvent in order to make the process cleaner and greener. The effects of various parameters on rates and product distribution are used to deduce the kinetics of the reaction. A second-order rate equation fits the data well under the assumption that both phenol and the alkylating agents are weakly adsorbed. The apparent activation energy was determined to be 8.57 kcal/mol. An independent dehydration study of tert-Amyl Alcohol was done.
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development of a novel mesoporous catalyst udcat 6 kinetics of synthesis of tert Amyl methyl ether tame from tert Amyl Alcohol and methanol
Journal of Physical Chemistry A, 2004Co-Authors: Ganapati D Yadav, Ambareesh D MurkuteAbstract:UDCaT-6, a novel active mesoporous and stable catalyst, was synthesized by generating in situ nanosized acidic centers of chlorosulfonic acid treated zirconia in the pores of highly ordered hexagonal mesoporous silica (HMS). For the first time, we have used chlorosulfonic acid as a source of sulfating agent to treat zirconia in pores of the HMS. The catalyst is characterized by XRD, FTIR, EDAX, SEM, and BET surface area and pore size analysis, and probe reactions. The structural integrity of HMS is maintained in UDCaT-6. The activity and stability of UDCaT-6 was tested in liquid phase alkylation of toluene with benzyl chloride and vapor phase synthesis of tert-Amyl methyl ether (TAME) from tert-Amyl Alcohol (TAA) and methanol where corrosive acid HCl and water are generated as biproducts. A complete theoretical and experimental analysis is presented and kinetics are evaluated. The model explains the experimental data very well.