Chemical Engineering & Technology

Cover image for Vol. 35 Issue 12

December, 2012

Volume 35, Issue 12

Pages 2063–2207

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Editorial Board
    4. Overview
    5. Contents
    6. Forum
    7. Scientific Highlights
    8. Research Articles
    9. Overview
    1. You have free access to this content
      Cover Chem. Eng. Technol. 12/2012

      Article first published online: 27 NOV 2012 | DOI: 10.1002/ceat.201290074

  2. Editorial Board

    1. Top of page
    2. Cover Picture
    3. Editorial Board
    4. Overview
    5. Contents
    6. Forum
    7. Scientific Highlights
    8. Research Articles
    9. Overview
    1. Editorial Board Chem. Eng. Technol. 12/2012

      Article first published online: 27 NOV 2012 | DOI: 10.1002/ceat.201290075

  3. Overview

    1. Top of page
    2. Cover Picture
    3. Editorial Board
    4. Overview
    5. Contents
    6. Forum
    7. Scientific Highlights
    8. Research Articles
    9. Overview
    1. Overview Contents: Chem. Eng. Technol. 12/2012 (page 2063)

      Article first published online: 27 NOV 2012 | DOI: 10.1002/ceat.201290076

  4. Contents

    1. Top of page
    2. Cover Picture
    3. Editorial Board
    4. Overview
    5. Contents
    6. Forum
    7. Scientific Highlights
    8. Research Articles
    9. Overview
    1. You have free access to this content
      Contents: Chem. Eng. Technol. 12/2012 (pages 2064–2069)

      Article first published online: 27 NOV 2012 | DOI: 10.1002/ceat.201290077

  5. Forum

    1. Top of page
    2. Cover Picture
    3. Editorial Board
    4. Overview
    5. Contents
    6. Forum
    7. Scientific Highlights
    8. Research Articles
    9. Overview
    1. Forum: Chem. Eng. Technol. 12/2012 (pages 2070–2071)

      Article first published online: 27 NOV 2012 | DOI: 10.1002/ceat.201290078

  6. Scientific Highlights

    1. Top of page
    2. Cover Picture
    3. Editorial Board
    4. Overview
    5. Contents
    6. Forum
    7. Scientific Highlights
    8. Research Articles
    9. Overview
    1. Scientific Highlights: Chem. Eng. Technol. 12/2012 (pages 2072–2073)

      Article first published online: 27 NOV 2012 | DOI: 10.1002/ceat.201290079

  7. Research Articles

    1. Top of page
    2. Cover Picture
    3. Editorial Board
    4. Overview
    5. Contents
    6. Forum
    7. Scientific Highlights
    8. Research Articles
    9. Overview
    1. Hydrodynamic and Mass Transfer Performances of a New SiC Foam Column Tray (pages 2075–2083)

      L. Zhang, X. Liu, H. Li, H. Sui, X. Li, J. Zhang, Z. Yang, C. Tian and G. Gao

      Article first published online: 7 NOV 2012 | DOI: 10.1002/ceat.201200032

      Thumbnail image of graphical abstract

      The hydrodynamic and mass transfer characteristics of a novel tray with SiC ceramic foam (SFCT) are studied in different pilot plants. The SFCT provides better performances compared to the conventional F1 float valve tray. The corresponding mathematical relationships are evaluated to predict the hydrodynamic properties of this kind of novel distillation tray and the mass transfer efficiency results are discussed.

    2. Recovery of Nickel and Cobalt from Spent NiMH Batteries by Electrowinning (pages 2084–2092)

      D. A. Bertuol, F. D. R. Amado, H. Veit, J. Z. Ferreira and A. M. Bernardes

      Article first published online: 27 NOV 2012 | DOI: 10.1002/ceat.201200283

      Thumbnail image of graphical abstract

      The recovery of nickel and cobalt present in spent NiMH batteries was performed by electrowinning. A two-compartment cell separated by an anionic membrane was constructed to avoid the usual problem of a laborious and reagent-consuming pH control. The results demonstrate the technical viability of this cell regarding current efficiency improvement, thereby recovering nickel and cobalt in an effective way.

    3. Reaction Mechanism and Kinetics of 1,8-Diazabicyclo[5.4.0]undec-7-ene and Carbon Dioxide in Alkanol Solutions (pages 2093–2098)

      M. Ç. Öztürk, C. S. Ume and E. Alper

      Article first published online: 7 NOV 2012 | DOI: 10.1002/ceat.201200341

      Thumbnail image of graphical abstract

      Reaction kinetics and potential applications of carbon dioxide-binding organic liquids, a novel class of carbon dioxide capture solvents, are discussed. An analysis of the rate constants and activation energies of the reaction between carbon dioxide and the diazabicycloundecene/1-alkanol solutions is reported.

    4. Analytical Approach for Calculating the Separation Efficiency of Uniflow Cyclones (pages 2099–2106)

      U. Muschelknautz

      Article first published online: 27 NOV 2012 | DOI: 10.1002/ceat.201200356

      Thumbnail image of graphical abstract

      An analytical model, based on an equilibrium orbit concept, for calculating the separation efficiency of uniflow cyclones for the separation of solid particles from gases is proposed. The model predicts the main tendencies of the separation efficiency as a function of geometry and operation data. Its application to uniflow cyclones operated in test facilities indicates good agreement with experimental data.

    5. Modeling and Simulation of Industrial PVC Drying in Fluidized Beds with Internal Heat Source (pages 2107–2119)

      A. Rodrigues Tacidelli, A. Tavernard Pereira Neto, R. Pereira Brito, A. C. Brandão de Araujo, L. Gonzaga Sales Vasconcelos and J. J. Nicácio Alves

      Article first published online: 1 NOV 2012 | DOI: 10.1002/ceat.201100713

      Thumbnail image of graphical abstract

      A two-fluid 1D transient mathematical model to design a drying operation control was developed, validated with data from PVC drying in an industrial continuous fluidized-bed dryer, and applied to simulate responses to disturbance on the PVC moisture content at the dryer inlet. The drying operation could be predicted satisfactorily by this model which due to its simplicity enables fast responses to disturbances in the process.

    6. Stability of Immobilized Candida sp. 99–125 Lipase for Biodiesel Production (pages 2120–2124)

      J. Lu, L. Deng, K. Nie, F. Wang and T. Tan

      Article first published online: 2 NOV 2012 | DOI: 10.1002/ceat.201200254

      Thumbnail image of graphical abstract

      The stability of immobilized Candida sp. 99–125 lipase was investigated. The lipase shows excellent stability in the biodiesel reaction medium. Methanol and glycerol showed the most negative effects on the lipase stability. Desorption was the main reason leading to lipase inactivation in the water system.

    7. Feasibility Study of a Solar Reactor for Phenol Treatment by the Photo-Fenton process in Aqueous Solution (pages 2125–2132)

      K. R. B. Nogueira, C. A. O. Nascimento, R. Guardani and A. C. S. C. Teixeira

      Article first published online: 27 NOV 2012 | DOI: 10.1002/ceat.201200269

      Thumbnail image of graphical abstract

      The performance of a pilot-scale solar reactor was compared for plug flow and mixed flow based on experimental results. Aqueous phenol solutions served as a model for industrial wastewater containing organic contaminants. Batch experiments carried out under clear sky achieved high removal rates. The dissolved organic carbon removal rate was simulated by an empirical model on the basis of neural networks.

    8. Enhancement of Turbulent Flow Heat Transfer in a Tube with Modified Twisted Tapes (pages 2133–2139)

      Y. G. Lei, C. H. Zhao and C. F. Song

      Article first published online: 2 NOV 2012 | DOI: 10.1002/ceat.201200218

      Thumbnail image of graphical abstract

      A new type of tube with staggered twisted tapes with central holes is presented. Heat transfer and pressure performance of the new tube with the modified twisted tapes are investigated numerically. The criterion of the thermal-hydraulic performance is used to evaluate the heat transfer and pressure drop performance of the tube with staggered twisted tapes with central holes.

    9. Direct Synthesis of Dimethyl Carbonate by Carboxylation of Methanol on Ceria-Based Mixed Oxides (pages 2140–2146)

      H. J. Hofmann, A. Brandner and P. Claus

      Article first published online: 2 NOV 2012 | DOI: 10.1002/ceat.201200475

      Thumbnail image of graphical abstract

      The utilization of CO2 to industrially relevant products presents a major challenge. By use of ceria-based catalysts, carboxylation of methanol with CO2 is possible up to equilibrium yields of dimethyl carbonate. A variation in reaction parameters and investigation of the catalyst properties can provide an insight into the catalyst's activity. Such activities are studied both in gas and liquid phase.

    10. Kinetics of o-Xylene Combustion over a Pt/Alumina Catalyst (pages 2147–2154)

      C. M. Manta, G. Bozga, G. Bercaru and C. S. Bîldea

      Article first published online: 1 NOV 2012 | DOI: 10.1002/ceat.201200371

      Thumbnail image of graphical abstract

      The o-xylene combustion in air over a Pt/γ-Al2O3 catalyst was studied under conditions typical for depollution applications. A kinetic model based on the Langmuir-Hinshelwood mechanism is formulated, accounting for the experimentally observed negative influences of o-xylene and water concentrations on process kinetics. The reliability of the proposed model is demonstrated by comparing its predictions with measurements.

    11. Determination of Heat Treatment Temperature for Completing Polycondensation of Vinyl Substituted Silica Particles Prepared by Sol-Gel Method (pages 2155–2160)

      K. M. Ashraf, S. Matsumoto and K. Kurumada

      Article first published online: 1 NOV 2012 | DOI: 10.1002/ceat.201200368

      Thumbnail image of graphical abstract

      The lowest heat treatment conditions required for the completion of the polycondensation of sol-gel derived hybrid silica particles prepared from vinyltrimethoxysilane and vinyltriethoxysilane were determined. The completion or incompletion of the polycondensation of the samples was evaluated using several instrumental methods in addition to light scattering tests.

    12. Measurement and Simulation of Axial Velocity in a Filter Bag (pages 2161–2169)

      M. Saleem, M. S. Tahir and G. Krammer

      Article first published online: 6 NOV 2012 | DOI: 10.1002/ceat.201200287

      Thumbnail image of graphical abstract

      The axial and radial velocity profiles in a filter bag have been experimentally measured under different loading conditions to verify the hypothesis that the local velocity through the filter elements depends on dust loading. The axial velocity is also modeled using a simple approach and compared to the experimental results. The actual velocity profile depends on the cake area load on the object bag as well as on its neighbors.

    13. Rapid Pyrolysis of Wheat Straw in a Bench-Scale Circulating Fluidized-Bed Downer Reactor (pages 2170–2176)

      T. Ding, S. Li, J. Xie, W. Song, J. Yao and W. Lin

      Article first published online: 8 NOV 2012 | DOI: 10.1002/ceat.201200140

      Thumbnail image of graphical abstract

      Pyrolysis is one of the promising routes for converting biomass into energy. The downer reactor offers significant advantages over conventional fluidized-bed reactors. The pyrolysis behavior of wheat straw is investigated in a bench-scale circulating fluidized-bed downer reactor to elucidate the effects of acid treatment on the pyrolysis product distribution and product properties.

    14. Mass Transfer Simulation of Gold Extraction in Membrane Extractors (pages 2177–2182)

      M. Ghadiri, S. Shirazian and S. N. Ashrafizadeh

      Article first published online: 2 NOV 2012 | DOI: 10.1002/ceat.201200289

      Thumbnail image of graphical abstract

      Extraction of gold in a solution of n-heptane and synergistic extractants was studied using a membrane extractor consisting of the tube side, the membrane, and the shell side. Simulation results showed that increasing the feed flow rate reduces the extraction efficiency, while doing the same for the organic phase flow rate does not change the extraction efficiency.

    15. Synthesis of Dimethyl Carbonate from Methyl Carbamate and Methanol Using a Fixed-Bed Reactor (pages 2183–2188)

      D. Wang, X. Zhang, W. Wei and Y. Sun

      Article first published online: 6 NOV 2012 | DOI: 10.1002/ceat.201200217

      Thumbnail image of graphical abstract

      The catalytic performance of a ZnO-Al2O3 catalyst for dimethyl carbonate (DMC) synthesis from methyl carbamate and methanol in a fixed-bed reactor was evaluated. DMC could be effectively synthesized by stripping off NH3 from the reaction zone which simultaneously minimized the side reactions. The catalyst prepared by coprecipitation presents high stability and a DMC yield of ∼ 73 % could be achieved.

    16. Hydrothermal Synthesis of Copper Hydroxyphosphate Hierarchical Architectures (pages 2189–2194)

      J. Xu, J. Zhang and X. Liu

      Article first published online: 6 NOV 2012 | DOI: 10.1002/ceat.201100698

      Thumbnail image of graphical abstract

      Copper hydroxy-phosphate, Cu2(OH)PO4, was synthesized through a hydrothermal route and the resulting hierarchical superstructures were characterized. The morphology of Cu2(OH)PO4 was found to change drastically with the addition of alcohol (ethanol, n-propanol, or ethylene glycol) as solvent. A possible mecha-nism for the formation of these copper hydroxyphosphate hierarchical superstructures is proposed.

    17. Active and Stable Ni-MgO Catalyst Coated on a Metal Monolith for Methane Steam Reforming under Low Steam-to-Carbon Ratios (pages 2195–2203)

      N. de Miguel, J. Manzanedo and P. L. Arias

      Article first published online: 8 NOV 2012 | DOI: 10.1002/ceat.201200259

      Thumbnail image of graphical abstract

      Ni-MgO is a promising catalyst for methane steam reforming due to the high stability of the NiO-MgO solid solution formed in this catalyst. The high activity and stability of the catalyst coated on a metallic monolith are demonstrated for methane steam reforming working at 700 °C and a steam-to-carbon ratio as low as 1.5, thus enabling more energy-efficient reforming processes for hydrogen production.

  8. Overview

    1. Top of page
    2. Cover Picture
    3. Editorial Board
    4. Overview
    5. Contents
    6. Forum
    7. Scientific Highlights
    8. Research Articles
    9. Overview
    1. You have free access to this content
      Overview Contents: Chemie Ingenieur Technik 12/2012 (page 2207)

      Article first published online: 27 NOV 2012 | DOI: 10.1002/ceat.201290080

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