Chemical Engineering & Technology

Cover image for Vol. 35 Issue 11

Special Issue: Grinding and Dispersing

November, 2012

Volume 35, Issue 11

Pages 1899–2059

Issue edited by: Arno Kwade

  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. 11/2012

      Article first published online: 26 OCT 2012 | DOI: 10.1002/ceat.201290067

  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. 11/2012

      Article first published online: 26 OCT 2012 | DOI: 10.1002/ceat.201290068

  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. 11/2012 (page 1899)

      Article first published online: 26 OCT 2012 | DOI: 10.1002/ceat.201290069

  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. 11/2012 (pages 1900–1905)

      Article first published online: 26 OCT 2012 | DOI: 10.1002/ceat.201290070

  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. 11/2012 (pages 1906–1907)

      Article first published online: 26 OCT 2012 | DOI: 10.1002/ceat.201290071

  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. 11/2012 (pages 1908–1909)

      Article first published online: 26 OCT 2012 | DOI: 10.1002/ceat.201290072

  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. Simulation of Stress Energy and Grinding Media Movement within a Wet-Operated Annular-Gap Mill Using the Discrete-Element Method (pages 1911–1921)

      S. Beinert, C. Schilde and A. Kwade

      Article first published online: 9 OCT 2012 | DOI: 10.1002/ceat.201200116

      Thumbnail image of graphical abstract

      In many grinding processes, wet-operated mills are used. An approach was derived to simulate a wet mill using a modified contact model in a discrete-element method. The model was compared with bead-bead simulations. The calculated bead movement could then be used to compute stress energy distributions. The gained results show that this approach is a possibility to calculate a wet-operated mill.

    2. Numerical Evaluation of Flow Fields and Stresses Acting on Agglomerates Dispersed in High-Pressure Microsystems (pages 1922–1930)

      S. Beinert, T. Gothsch and A. Kwade

      Article first published online: 9 OCT 2012 | DOI: 10.1002/ceat.201200117

      Thumbnail image of graphical abstract

      Flow fields in a straight, an orifice, a z- and a y-microchannel were investigated. Stationary particle tracking leads to the acting stresses. These stresses (tensile, shear, turbulent and compressive stress) are compared with the results of previously conducted dispersion experiments. Distributions of stresses and particle sizes were compared. Good agreement was found between experiments and simulations, but the predominant mechanism could not be identified.

    3. Wet-Media Milling of Colloidal Drug Suspensions Stabilized by Means of Charged Nanoparticles (pages 1931–1940)

      M. Juhnke and E. John

      Article first published online: 4 OCT 2012 | DOI: 10.1002/ceat.201200139

      Thumbnail image of graphical abstract

      Colloidal drug particles can be produced by wet-media milling using charged nanoparticles to enable drug particle stabilization. Such stabilization was facilitated using dissolved nonionic polymer molecules and highly charged nanoparticles. The general applicability of charged nanoparticles for colloidal drug stabilization combined with an industrially relevant production technology is demonstrated.

    4. High-Precision Power Measurement for the Grindability Test According to Zeisel (pages 1941–1948)

      P. M. Fleiger, R. Reichardt and K. Treiber

      Article first published online: 4 OCT 2012 | DOI: 10.1002/ceat.201200118

      Thumbnail image of graphical abstract

      The reliability of the grindability test according to Zeisel is affected by a number of influencing parameters but also by the applied measurement techniques. The precise measurement of the grinding work by a load cell is introduced which replaces the traditional measurement by a protractor. Vibration during the test could be reduced and detailed data of the energy consumption could be obtained.

    5. Ceramic Media Selection for Optimization of Energy Efficiency in IsaMills™ (pages 1949–1953)

      B. Durant, B. Y. Farber, C. Rule and A. Mainza

      Article first published online: 9 OCT 2012 | DOI: 10.1002/ceat.201200121

      Thumbnail image of graphical abstract

      Using laboratory scale trials the influence of media density and friction coefficient on energy consumption in a M4 laboratory scale IsaMill™ is demonstrated for a number of ceramic media in a water environment. The experiments lead to a better understanding of the effect of media properties on the power draws.

    6. Mixing Analysis for a Fermentation Broth of the Fungus Beauveria bassiana under Different Hydrodynamic Conditions in a Bioreactor (pages 1954–1961)

      D. M. Núñez-Ramírez, J. J. Valencia-López, F. Calderas, A. Solís-Soto, J. López-Miranda, H. Medrano-Roldán and L. Medina-Torres

      Article first published online: 24 SEP 2012 | DOI: 10.1002/ceat.201200130

      Thumbnail image of graphical abstract

      The hydrodynamics of the fungi system Beauveria bassiana has been experimentally evaluated for different conditions in a mixing tank with a two-impeller configuration and Newtonian as well as non-Newtonian model fluids. Numerical simulations are essential to understand and optimize these systems. The simulation of streamlines for a radial-axial Rushton-Maxflo impeller configuration is presented.

    7. A Scalable Preparation Method for SILP and SCILL Ionic Liquid Thin-Film Materials (pages 1962–1967)

      S. Werner, N. Szesni, M. Kaiser, M. Haumann and P. Wasserscheid

      Article first published online: 26 OCT 2012 | DOI: 10.1002/ceat.201200210

      Thumbnail image of graphical abstract

      Supported ionic liquid phase (SILP) catalysts consist of a homogeneous catalyst that is dissolved in an ionic liquid and dispersed on a porous support material. A novel preparation method for SILP catalysts is presented that is scalable for larger batches, as required for industrial use. Different types of support materials such as powders, spheres, agglomerates, and extrudates were successfully impregnated by the novel fluidized-bed impregnation method. The distribution of the ionic liquid and catalyst was analyzed by SEM-EDX.

    8. Release of Gas-Phase O2 from Ilmenite during Chemical-Looping Combustion Experiments (pages 1968–1972)

      M. Rydén, C. Linderholm, P. Markström and A. Lyngfelt

      Article first published online: 4 OCT 2012 | DOI: 10.1002/ceat.201200281

      Thumbnail image of graphical abstract

      Ilmenite has been found to release gas phase O2 during chemical-looping combustion experi-ments. The phenomena manifested itself as an O2 concentration of 1.0–1.5 vol. % when fluidizing the air reactor with air and the fuel reactor with steam. The O2 release is small, but due to the presence of steam as fluidization medium, considerable O2 concen-trations could be obtained if analyzed on dry basis.

    9. Increasing the Storage Capacity and Selectivity in the Formation of Natural Gas Hydrates Using Porous Media (pages 1973–1980)

      N. Gholipour Zanjani, A. Zarringhalam Moghaddam, K. Nazari and M. Mohammad-Taheri

      Article first published online: 4 OCT 2012 | DOI: 10.1002/ceat.201200089

      Thumbnail image of graphical abstract

      Gas hydrate formation in natural gas and in the ternary gas mixture of CH4, C2H6, and C3H8 was performed with a fixed amount of water with and without the addition of porous media. The addition of colloidal silica media increased substantially the gas storage capacity of the hydrate phase. The purification factor of CH4 became significantly higher in the presence of silica-based porous media.

    10. Non-Newtonian Flows in Annuli with Variable Eccentric Motion of the Inner Tube (pages 1981–1988)

      J. L. Vieira Neto, A. L. Martins, C. H. Ataíde and M. A. S. Barrozo

      Article first published online: 2 OCT 2012 | DOI: 10.1002/ceat.201200239

      Thumbnail image of graphical abstract

      Computational fluid dynamics (CFD) simulations and experimental studies were developed in order to analyze the pressure drop through two eccentric annuli with variable eccentric motion of the inner cylinder, using xanthan gum solutions. The effects of four important operating variables were quantified. The comparison between CFD simulations and experimental data indicated a very good agreement.

    11. Thermal Effects on the Synthesis of 1,1-Dibutoxyethane in a Fixed-Bed Adsorptive Reactor (pages 1989–1997)

      N. S. Graça, L. S. Pais, V. M. T. M. Silva and A. E. Rodrigues

      Article first published online: 2 OCT 2012 | DOI: 10.1002/ceat.201100705

      Thumbnail image of graphical abstract

      The effects of temperature on the synthesis of 1,1-dibutoxyethane (DBE) in a fixed-bed adsorptive reactor were studied by performing both adsorption/desorption and reaction/regeneration experiments at 15 and 35 °C. Isothermal and nonisothermal mathematical models were used to simulate the reactor operation with different Damköhler numbers. The simulated results suggest that the reactor productivity can be improved by using the adiabatic operation mode on the fixed-bed adsorptive reactor.

    12. Effect of Operating Conditions and Powder Properties on Pneumatic Conveying Characteristics of a Top Discharge Blow Tank (pages 1998–2006)

      G. Xu, X. Chen, C. Liang, P. Xu, J. Cai and C. Zhao

      Article first published online: 9 OCT 2012 | DOI: 10.1002/ceat.201100675

      Thumbnail image of graphical abstract

      The effects of fluidizing and pressurizing gas flow rates on the pneumatic conveying characteristics in a top discharge blow tank pneumatic conveying system were discussed. Pulverized coal and glass beads were used to investigate the influence of powder properties on conveying performance. Powder flow patterns in the tank were evaluated under different operating conditions.

    13. Modeling and Optimization of Fe(III) Adsorption from Water using Bentonite Clay: Comparison of Central Composite Design and Artificial Neural Network (pages 2007–2014)

      I. M. Savic, S. T. Stojiljkovic, I. M. Savic, S. B. Stojanovic and K. Moder

      Article first published online: 1 OCT 2012 | DOI: 10.1002/ceat.201200085

      Thumbnail image of graphical abstract

      The process of Fe(III) adsorption from water was modeled and optimized by means of multilayer perceptron (MLP) and central com-posite design (CCD). Bentonite clay was applied as a cheap and effective adsorbent. Compared with CCD, MLP proved to be a better tool for prediction of the adsorbed amount of Fe(III) from water and provided the best perfor-mance. The optimal adsorption conditions for both models were determined.

    14. Thermo-Responsive Polyethersulfone Composite Membranes Blended with Poly(N-isopropylacrylamide) Nanogels (pages 2015–2022)

      G. Wang, R. Xie, X.-J. Ju and L.-Y. Chu

      Article first published online: 9 OCT 2012 | DOI: 10.1002/ceat.201200235

      Thumbnail image of graphical abstract

      Thermo-responsive composite polyethersulfone (PES) membranes blended with monodisperse homogeneous poly(N-isopropylacryl-amide) (PNIPAM) nanogels were prepared from blends of PES solution and PNIPAM nanoparticles by phase inversion technique. The membranes exhibit satisfactorily reversible and reproducible thermo-responsive permeation performance.

    15. Development of an Efficient Method for the Removal of Silane Compounds from Exhaust Air (pages 2023–2029)

      B. Hickstein, B. Meynhardt, O. Niemeier and D. Weber

      Article first published online: 9 OCT 2012 | DOI: 10.1002/ceat.201200222

      Thumbnail image of graphical abstract

      Experimental work and the corresponding scale-up are presented to overcome the challenge of removing volatile siloxane compounds in a complex exhaust air from a synthesis process of an active pharmaceutical ingredient. The capability of 96 % H2SO4 for the removal of hexamethyldisiloxane from an exhaust air on a technical scale is presented.

    16. Kinetics of the Decomposition of Hydrogen Sulfide in a Dielectric Barrier Discharge Reactor (pages 2030–2034)

      E. Linga Reddy, J. Karuppiah, A. Renken, L. Kiwi-Minsker and C. Subrahmanyam

      Article first published online: 9 OCT 2012 | DOI: 10.1002/ceat.201200134

      Thumbnail image of graphical abstract

      H2S decomposition into its constituent elements H2 and S in a nonthermal plasma dielectric barrier discharge reactor has been investigated. Based on the Michaelis-Menten/Langmuir Hinshelwood model, a reaction rate model for H2S decomposition was developed confirming that the reaction order approaches zero with increasing inlet concentration.

    17. High-Speed Particle Image Velocimetry Measurements of Turbulent Pipe Flows for Verification of a Fluid-Dynamic Cavitation Model (pages 2035–2044)

      K. M. Opitz, S. R. Engel, A. F. Koegler, A. Leipertz and E. Schlücker

      Article first published online: 26 OCT 2012 | DOI: 10.1002/ceat.201200209

      Thumbnail image of graphical abstract

      A fluid-dynamic cavitation model for reciprocating positive displacement pumps could be verified and established by means of high-speed particle image velocimetry (PIV) measurements. The PIV results demonstrate that the proposed model corresponds with the physical reality. It offers an excellent possibility for manufacturers to predict a limit for the extent of occurring cavitation in fluid handling.

    18. Process Study of the Formation of Biodegradable Polymer Microspheres for Tissue Engineering (pages 2045–2050)

      G. Griffini, M. Levi and S. Turri

      Article first published online: 9 OCT 2012 | DOI: 10.1002/ceat.201200216

      Thumbnail image of graphical abstract

      A series of biodegradable polymer microspheres was prepared by solvent evaporation. The dimension of these microspheres was found to be depending on fluid-dynamic parameters of the dispersion process. The polylactic-co-glycolic acid microspheres obtained in this way may be applied for fabrication of biodegradable scaffolds for tissue engineering.

    19. Selecting Ceramic Grinding Media: Part 1 – Theory (pages 2051–2057)

      H. Kotzé

      Article first published online: 26 OCT 2012 | DOI: 10.1002/ceat.201200122

      Thumbnail image of graphical abstract

      In the mining industry, grinding media wear versus cost is a key optimization consideration. Quantification of wear can be done indirectly via small-scale laboratory mill tests or potentially via measurement of the physical and mechanical properties of the media. The importance of hardness and toughness of grinding media in the stirred-mill environment are explained.

  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 11/2012 (page 2059)

      Article first published online: 26 OCT 2012 | DOI: 10.1002/ceat.201290073

SEARCH

SEARCH BY CITATION