The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
Qinglian Wang - One of the best experts on this subject based on the ideXlab platform.
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Isobaric vapor-liquid equilibrium of the binary system sec-butyl acetate + Para-Xylene and the quaternary system methyl acetate + Para- Xylene + sec-butyl acetate + acetic acid at 101.3 kPa
Fluid Phase Equilibria, 2015Co-Authors: Dan Huang, Chen Yang, Qinglian WangAbstract:Abstract Isobaric vapor–liquid equilibrium (VLE) of sec-butyl acetate + Para-Xylene binary system and methyl acetate + Para-Xylene + sec-butyl acetate + acetic acid quaternary system were determined at 101.3 kPa in a modified Rose still, so as to provide a basis for the design and simulation of the seParation process of acetic acid dehydration system. In the present study, the L–W integral test was used to check the thermodynamic consistency of binary VLE data. The results indicated that the thermodynamic consistency of binary VLE data measured in this paper was satisfactory. Furthermore, binary experimental data were correlated well by three models, which are the NRTL, Wilson and UNIQUAC models, respectively. Subsequently, the corresponding binary interaction Parameters of each model were obtained. In addition, the NRTL activity coefficient model in combination with Marek–Standart chemical theory was used to predict the quaternary system VLE data for the association of acetic acid.
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isobaric vapor liquid equilibrium of the binary system sec butyl acetate Para Xylene and the quaternary system methyl acetate Para Xylene sec butyl acetate acetic acid at 101 3 kpa
Fluid Phase Equilibria, 2015Co-Authors: Dan Huang, Chen Yang, Qinglian WangAbstract:Abstract Isobaric vapor–liquid equilibrium (VLE) of sec-butyl acetate + Para-Xylene binary system and methyl acetate + Para-Xylene + sec-butyl acetate + acetic acid quaternary system were determined at 101.3 kPa in a modified Rose still, so as to provide a basis for the design and simulation of the seParation process of acetic acid dehydration system. In the present study, the L–W integral test was used to check the thermodynamic consistency of binary VLE data. The results indicated that the thermodynamic consistency of binary VLE data measured in this paper was satisfactory. Furthermore, binary experimental data were correlated well by three models, which are the NRTL, Wilson and UNIQUAC models, respectively. Subsequently, the corresponding binary interaction Parameters of each model were obtained. In addition, the NRTL activity coefficient model in combination with Marek–Standart chemical theory was used to predict the quaternary system VLE data for the association of acetic acid.
Dan Huang - One of the best experts on this subject based on the ideXlab platform.
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Isobaric vapor-liquid equilibrium of the binary system sec-butyl acetate + Para-Xylene and the quaternary system methyl acetate + Para- Xylene + sec-butyl acetate + acetic acid at 101.3 kPa
Fluid Phase Equilibria, 2015Co-Authors: Dan Huang, Chen Yang, Qinglian WangAbstract:Abstract Isobaric vapor–liquid equilibrium (VLE) of sec-butyl acetate + Para-Xylene binary system and methyl acetate + Para-Xylene + sec-butyl acetate + acetic acid quaternary system were determined at 101.3 kPa in a modified Rose still, so as to provide a basis for the design and simulation of the seParation process of acetic acid dehydration system. In the present study, the L–W integral test was used to check the thermodynamic consistency of binary VLE data. The results indicated that the thermodynamic consistency of binary VLE data measured in this paper was satisfactory. Furthermore, binary experimental data were correlated well by three models, which are the NRTL, Wilson and UNIQUAC models, respectively. Subsequently, the corresponding binary interaction Parameters of each model were obtained. In addition, the NRTL activity coefficient model in combination with Marek–Standart chemical theory was used to predict the quaternary system VLE data for the association of acetic acid.
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isobaric vapor liquid equilibrium of the binary system sec butyl acetate Para Xylene and the quaternary system methyl acetate Para Xylene sec butyl acetate acetic acid at 101 3 kpa
Fluid Phase Equilibria, 2015Co-Authors: Dan Huang, Chen Yang, Qinglian WangAbstract:Abstract Isobaric vapor–liquid equilibrium (VLE) of sec-butyl acetate + Para-Xylene binary system and methyl acetate + Para-Xylene + sec-butyl acetate + acetic acid quaternary system were determined at 101.3 kPa in a modified Rose still, so as to provide a basis for the design and simulation of the seParation process of acetic acid dehydration system. In the present study, the L–W integral test was used to check the thermodynamic consistency of binary VLE data. The results indicated that the thermodynamic consistency of binary VLE data measured in this paper was satisfactory. Furthermore, binary experimental data were correlated well by three models, which are the NRTL, Wilson and UNIQUAC models, respectively. Subsequently, the corresponding binary interaction Parameters of each model were obtained. In addition, the NRTL activity coefficient model in combination with Marek–Standart chemical theory was used to predict the quaternary system VLE data for the association of acetic acid.
Jianqiang Zhang - One of the best experts on this subject based on the ideXlab platform.
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liquid liquid equilibria for ternary systems polyoxymethylene dimethyl ethers Para Xylene water
The Journal of Chemical Thermodynamics, 2016Co-Authors: Zhihai Zhuang, Jianqiang ZhangAbstract:Abstract Polyoxymethylene dimethyl ethers (PODEn) are promising diesel additives which can be synthesized from formaldehyde and methanol. In this work, the ternary liquid–liquid equilibria (LLE) were analytically determined at 293.15 K and 313.15 K for the following systems: PODE1 + Para-Xylene (PX) + water, PODE2 + PX + water, PODE3 + PX + water, PODE4 + PX + water, respectively. The isothermal experimental results have shown a good linear fit in Hand plots and the Othmer–Tobias. The design of the solvent extraction equipment for extracting PODEn from aqueous solution requires an appropriate model for the liquid–liquid phase equilibrium. The well-known NRTL and UNIQUAC thermodynamic models were applied to correlate the experimental data, and the results indicate that the UNIQUAC model gives a better agreement.
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Liquid–liquid equilibria for ternary systems polyoxymethylene dimethyl ethers + Para-Xylene + water
The Journal of Chemical Thermodynamics, 2016Co-Authors: Zhihai Zhuang, Jianqiang ZhangAbstract:Abstract Polyoxymethylene dimethyl ethers (PODEn) are promising diesel additives which can be synthesized from formaldehyde and methanol. In this work, the ternary liquid–liquid equilibria (LLE) were analytically determined at 293.15 K and 313.15 K for the following systems: PODE1 + Para-Xylene (PX) + water, PODE2 + PX + water, PODE3 + PX + water, PODE4 + PX + water, respectively. The isothermal experimental results have shown a good linear fit in Hand plots and the Othmer–Tobias. The design of the solvent extraction equipment for extracting PODEn from aqueous solution requires an appropriate model for the liquid–liquid phase equilibrium. The well-known NRTL and UNIQUAC thermodynamic models were applied to correlate the experimental data, and the results indicate that the UNIQUAC model gives a better agreement.
P Ratnasamy - One of the best experts on this subject based on the ideXlab platform.
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selective oxidation of Para Xylene to terephthalic acid by μ3 oxo bridged co mn cluster complexes encapsulated in zeolite y
Journal of Catalysis, 2001Co-Authors: Suhas A Chavan, D Srinivas, P RatnasamyAbstract:Abstract Novel, solid catalysts of μ 3 -oxo-bridged Co/Mn cluster complexes, viz., [Co 3 (O)(CH 3 COO) 6 (pyridine) 3 ] + , [Mn 3 (O) (CH 3 COO) 6 (pyridine) 3 ] + , and CoMn 2 (O)(CH 3 COO) 6 (pyridine) 3 (denoted Co 3 (O), Mn 3 (O), and CoMn 2 (O), respectively), encapsulated in zeolite-Y oxidize selectively, Para -Xylene to terephthalic acid with dioxygen. The catalysts were prepared by the “flexible ligand synthesis” method and characterized by X-ray diffraction, thermal analysis, cyclic voltammetry, Fourier transform infrared, diffuse reflectance ultraviolet–visible, X-ray photoelectron spectroscopy, and electron Paramagnetic resonance spectroscopic techniques. The various physicochemical measurements confirm the presence and structural integrity of the μ 3 -oxo-bridged cluster complexes in zeolite cavities. The activity and selectivity of both the “neat” and encapsulated cluster complexes followed the order CoMn 2 (O)>Mn 3 (O)>Co 3 (O), revealing the superiority of the heteronuclear complexes. Under optimal conditions, both neat and encapsulated cluster catalysts exhibit 100% Para -Xylene conversion with >98% selectivity for terephthalic acid. It is important that the key impurity, 4-carboxybenzaldehyde, is significantly lower in abundance (than the current commercial catalysts) with one of the zeolite-encapsulated catalysts, CoMn 2 (O)–Y. Leaching of metal ions from the solid catalyst during reaction is minimal and the catalyst could be recycled without significant loss of activity. A more facile redox behavior of Co between +2 and +3 oxidation states in CoMn 2 (O) (confirmed by cyclic voltammetry) is perhaps responsible for high catalytic activity.
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Selective Oxidation of Para-Xylene to Terephthalic Acid by μ3-Oxo-Bridged Co/Mn Cluster Complexes Encapsulated in Zeolite–Y
Journal of Catalysis, 2001Co-Authors: Suhas Arunkumar Chavan, Darbha Srinivas, P RatnasamyAbstract:Abstract Novel, solid catalysts of μ 3 -oxo-bridged Co/Mn cluster complexes, viz., [Co 3 (O)(CH 3 COO) 6 (pyridine) 3 ] + , [Mn 3 (O) (CH 3 COO) 6 (pyridine) 3 ] + , and CoMn 2 (O)(CH 3 COO) 6 (pyridine) 3 (denoted Co 3 (O), Mn 3 (O), and CoMn 2 (O), respectively), encapsulated in zeolite-Y oxidize selectively, Para -Xylene to terephthalic acid with dioxygen. The catalysts were prepared by the “flexible ligand synthesis” method and characterized by X-ray diffraction, thermal analysis, cyclic voltammetry, Fourier transform infrared, diffuse reflectance ultraviolet–visible, X-ray photoelectron spectroscopy, and electron Paramagnetic resonance spectroscopic techniques. The various physicochemical measurements confirm the presence and structural integrity of the μ 3 -oxo-bridged cluster complexes in zeolite cavities. The activity and selectivity of both the “neat” and encapsulated cluster complexes followed the order CoMn 2 (O)>Mn 3 (O)>Co 3 (O), revealing the superiority of the heteronuclear complexes. Under optimal conditions, both neat and encapsulated cluster catalysts exhibit 100% Para -Xylene conversion with >98% selectivity for terephthalic acid. It is important that the key impurity, 4-carboxybenzaldehyde, is significantly lower in abundance (than the current commercial catalysts) with one of the zeolite-encapsulated catalysts, CoMn 2 (O)–Y. Leaching of metal ions from the solid catalyst during reaction is minimal and the catalyst could be recycled without significant loss of activity. A more facile redox behavior of Co between +2 and +3 oxidation states in CoMn 2 (O) (confirmed by cyclic voltammetry) is perhaps responsible for high catalytic activity.
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a novel zeolite encapsulated μ3 oxo co mn cluster catalyst for oxidation of Para Xylene to terephthalic acid
Chemical Communications, 2001Co-Authors: Suhas A Chavan, D Srinivas, P RatnasamyAbstract:Trinuclear, μ3-oxo mixed metal acetato complexes, [CoMn2(μ3-O)(MeCO2)6(py) 3] (py = pyridine) encapsulated in zeolite HY, exhibit high catalytic efficiency in the selective aerial oxidation of Para-Xylene to terephthalic acid; interestingly, the formation of 4-carboxybenzaldehyde, the worrisome impurity in the conventional process, is suppressed significantly over these solid catalysts.
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oxidation of Para Xylene over zeolite encapsulated copper and manganese complexes
Applied Catalysis A-general, 1999Co-Authors: Chandra R Jacob, Saji P Varkey, P RatnasamyAbstract:Abstract Salen, saltin and salcyhexen complexes of copper and manganese, encapsulated in the cavities of zeolite NaX have been investigated as catalysts for the aerobic oxidation of Para -Xylene in the absence of added halogen promoters and using tertiary -butyl hydroperoxide as the initiator at low temperatures. Significant conversion levels (upto 50–60%) are attained. The major products include toluic acid, toluyl aldehyde and toluyl alcohol. The zeolite-encapsulated complexes did not undergo any colour change during the reaction and could be easily seParated and reused many times. In contrast, the neat complexes, while they were active in the first cycle, were completely destroyed during the run and changed colour. They, however, gave lower conversions compared to the encapsulated catalysts. Conversion increases when electron-withdrawing substituents (like Cl, Br and NO 2 ) are substituted in the aromatic ring.
Chen Yang - One of the best experts on this subject based on the ideXlab platform.
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Isobaric vapor-liquid equilibrium of the binary system sec-butyl acetate + Para-Xylene and the quaternary system methyl acetate + Para- Xylene + sec-butyl acetate + acetic acid at 101.3 kPa
Fluid Phase Equilibria, 2015Co-Authors: Dan Huang, Chen Yang, Qinglian WangAbstract:Abstract Isobaric vapor–liquid equilibrium (VLE) of sec-butyl acetate + Para-Xylene binary system and methyl acetate + Para-Xylene + sec-butyl acetate + acetic acid quaternary system were determined at 101.3 kPa in a modified Rose still, so as to provide a basis for the design and simulation of the seParation process of acetic acid dehydration system. In the present study, the L–W integral test was used to check the thermodynamic consistency of binary VLE data. The results indicated that the thermodynamic consistency of binary VLE data measured in this paper was satisfactory. Furthermore, binary experimental data were correlated well by three models, which are the NRTL, Wilson and UNIQUAC models, respectively. Subsequently, the corresponding binary interaction Parameters of each model were obtained. In addition, the NRTL activity coefficient model in combination with Marek–Standart chemical theory was used to predict the quaternary system VLE data for the association of acetic acid.
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isobaric vapor liquid equilibrium of the binary system sec butyl acetate Para Xylene and the quaternary system methyl acetate Para Xylene sec butyl acetate acetic acid at 101 3 kpa
Fluid Phase Equilibria, 2015Co-Authors: Dan Huang, Chen Yang, Qinglian WangAbstract:Abstract Isobaric vapor–liquid equilibrium (VLE) of sec-butyl acetate + Para-Xylene binary system and methyl acetate + Para-Xylene + sec-butyl acetate + acetic acid quaternary system were determined at 101.3 kPa in a modified Rose still, so as to provide a basis for the design and simulation of the seParation process of acetic acid dehydration system. In the present study, the L–W integral test was used to check the thermodynamic consistency of binary VLE data. The results indicated that the thermodynamic consistency of binary VLE data measured in this paper was satisfactory. Furthermore, binary experimental data were correlated well by three models, which are the NRTL, Wilson and UNIQUAC models, respectively. Subsequently, the corresponding binary interaction Parameters of each model were obtained. In addition, the NRTL activity coefficient model in combination with Marek–Standart chemical theory was used to predict the quaternary system VLE data for the association of acetic acid.
