Phthalic Anhydride

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Yu. V. Musin - One of the best experts on this subject based on the ideXlab platform.

Firuz Zainuddin - One of the best experts on this subject based on the ideXlab platform.

José Luis García Fierro - One of the best experts on this subject based on the ideXlab platform.

  • Oxidation of o-Xylene to Phthalic Anhydride on Sb-V/ZrO_2 Catalysts
    Catalysis Letters, 2003
    Co-Authors: C.l. Pieck, Miguel A. Bañares, M. López Granados, José Luis García Fierro
    Abstract:

    Zirconia-supported and bulk-mixed vanadiumantimonium oxide catalysts were used for the oxidation of o -xylene to Phthalic Anhydride. X-ray diffraction, Raman spectroscopy and photoelectron spectroscopy were used for characterization. It was found that vanadium promotes the transition of tetragonal to monoclinic zirconia. The simultaneous presence of Sb and V on zirconia at low coverage led to a preferential interaction of individual V and Sb oxides with the zirconia surface rather than the formation of a binary Sb-V oxide, while at higher Sb-V contents the formation of SbVO_4 took place. Sb-V/ZrO_2 catalysts showed high activity for o -xylene conversion and better selectivity to Phthalic Anhydride as compared to V/ZrO_2 catalysts. However, their selectivity to Phthalic Anhydride was poor in comparison to a V/TiO_2 commercial catalyst. The improved selectivity of the Sb-containing catalysts is attributed to the blocking of non-effective surface sites of ZrO_2, the decrease of the total amount of acid sites and the formation of surface V-O-Sb-O-V structures.

  • Selective oxidation of o-xylene to Phthalic Anhydride on V2O5 supported on TiO2-coated SiO2
    Catalysis Letters, 1997
    Co-Authors: Cristina R. Dias, M.f. Portela, M. Galan-fereres, Miguel A. Bañares, M. López Granados, Miguel A. Peña, José Luis García Fierro
    Abstract:

    A ternary V-Ti-Si catalyst was prepared by depositing the vanadium oxide precursor on a SiO2 previously coated by TiO2. The ternary V-Ti-Si catalyst and the corresponding binary V-Ti and V-Si counterparts were tested for the selective oxidation of o-xylene to Phthalic Anhydride. Silica-supported vanadium oxide shows lowest activity and selectivity, meanwhile selectivity to Phthalic Anhydride is higher on titania-containing catalysts. The best yield to Phthalic Anhydride (82.5%) is obtained at 573 K on the ternary V-Ti-Si catalyst which is comparable to that claimed for the best conventional V-Ti catalysts described in literature.

A.g. Supri - One of the best experts on this subject based on the ideXlab platform.

  • EFFECT OF Phthalic Anhydride ON TENSILE PROPERTIES AND THERMAL STABILITY OF RECYCLED HIGH DENSITY POLYETHYLENE / WOOD FIBER COMPOSITES
    Jurnal Teknologi, 2015
    Co-Authors: M.p.m. Hanif, A.g. Supri, Firuz Zainuddin
    Abstract:

    The effect of Phthalic Anhydride as a coupling agent on the tensile properties and thermal stability of recycled high density polyethylene/wood fiber (rHDPE/WF) composites were studied.  Both composites rHDPE/WF and rHDPE/WF/PAH (modified with Phthalic Anhydride) were prepared using Brabender Plasticorder at a temperature of 160°C and rotor speed of 50 rpm. The result indicated that rHDPE/WF/PAH composites exhibit higher tensile strength and modulus of elasticity than rHDPE/WF composites. It was also found that the addition of Phthalic Anhydride offers better thermal stability in rHDPE/WF/PAH composites than that of rHDPE/WF composites.

  • effect of Phthalic Anhydride on tensile properties and thermal stability of recycled high density polyethylene wood fiber composites
    Jurnal Teknologi, 2015
    Co-Authors: M.p.m. Hanif, A.g. Supri, Firuz Zainuddin
    Abstract:

    The effect of Phthalic Anhydride as a coupling agent on the tensile properties and thermal stability of recycled high density polyethylene/wood fiber (rHDPE/WF) composites were studied.  Both composites rHDPE/WF and rHDPE/WF/PAH (modified with Phthalic Anhydride) were prepared using Brabender Plasticorder at a temperature of 160°C and rotor speed of 50 rpm. The result indicated that rHDPE/WF/PAH composites exhibit higher tensile strength and modulus of elasticity than rHDPE/WF composites. It was also found that the addition of Phthalic Anhydride offers better thermal stability in rHDPE/WF/PAH composites than that of rHDPE/WF composites.

  • Effect of Vinyl Alcohol-Phthalic Anhydride on Properties of Low Density Polyethylene (LDPE)/Tyre Dust (TD) Composites
    Polymer-Plastics Technology and Engineering, 2012
    Co-Authors: A.g. Supri, Hanafi Ismail
    Abstract:

    The effect of vinyl alcohol-Phthalic Anhydride as a coupling agent on the tensile properties, morphology, and thermal degradation of low density polyethylene/tyre dust (LDPE/TD) composites was studied. LDPE/TD composites with different tyre dust loading and the addition of vinyl alcohol-Phthalic Anhydride were prepared with Z-blade mixer at 180°C and rotor speed of 50 rpm. The result indicated that LDPE/TDM composites with vinyl alcohol-Phthalic Anhydride show higher values of tensile strength, Young's modulus and mass swell, but lower elongation at break than LDPE/TD composites without vinyl alcohol-Phthalic Anhydride. The SEM micrographs showed that the tyre dust was more widely dispersed in the LDPE matrix with the addition of vinyl alcohol-Phthalic Anhydride as a coupling agent. It was also found that the addition of vinyl alcohol-Phthalic Anhydride offers better thermal stability in the LDPE/TDM composites than LDPE/TD composites.

Guoji Liu - One of the best experts on this subject based on the ideXlab platform.

  • Solubility and dissolution thermodynamics of Phthalic Anhydride in organic solvents at 283–313 K
    Russian Journal of Physical Chemistry A, 2017
    Co-Authors: Long Wang, Fang Zhang, Xiaoqiang Gao, Tingliang Luo, Guoji Liu
    Abstract:

    The solubility of Phthalic Anhydride was measured at 283–313 K under atmospheric pressure in ethyl acetate, n-propyl acetate, methyl acetate, acetone, 1,4-dioxane, n-hexane, n-butyl acetate, cyclohexane, and dichloromethane. The solubility of Phthalic Anhydride in all solvents increased with the increasing temperature. The Van’t Hoff equation, modified Apelblat equation, λh equation, and Wilson model were used to correlate the experimental solubility data. The standard dissolution enthalpy, the standard entropy, and the standard Gibbs energy were evaluated based on the Van’t Hoff analysis. The experimental data and model parameters would be useful for optimizing of the separation processes involving Phthalic Anhydride.

  • solid liquid equilibrium and phase diagram for the ternary 2 naphthaldehyde o Phthalic Anhydride 1 4 dioxane system
    The Journal of Chemical Thermodynamics, 2016
    Co-Authors: Fang Zhang, Xiaoqiang Gao, Guoji Liu
    Abstract:

    Abstract In this research, solid-liquid equilibrium for the ternary system (2-naphthaldehyde + o-Phthalic Anhydride + 1,4-dioxane) was measured at 283.15 K, 293.15 K and 303.15 K, respectively. Three isothermal phase diagrams of the system were plotted using the values of the experimental solubility. Pure 2-naphthaldehyde and o-Phthalic Anhydride were formed at (283.15, 293.15 and 303.15) K, and were determined by Schreinemaker’s wet residue method. The crystallization region of o-Phthalic Anhydride was found to be much larger than that of 2-naphthaldehyde at a certain temperature. The experimental solubility at multiple temperatures was correlated by the NRTL and Wilson models. The NRTL model was more accurate than the Wilson model in this system. The diagram of density versus component was also constructed.

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