Chemical Engineering & Technology

Cover image for Vol. 37 Issue 10

Early View (Online Version of Record published before inclusion in an issue)

Impact Factor: 2.175

ISI Journal Citation Reports © Ranking: 2013: 39/133 (Engineering Chemical)

Online ISSN: 1521-4125

Associated Title(s): Chemie Ingenieur Technik, ChemBioEng Reviews, Energy Technology

VIEW

  1. 1 - 20
  1. Communications

    1. Chiral Resolution of Racemic Cyclopropanecarboxylic Acids in Supercritical Carbon Dioxide

      Dániel Varga, György Bánsághi, Jorge Agustín Martínez Pérez, Sándor Miskolczi, László Hegedűs, Béla Simándi and Edit Székely

      Article first published online: 8 OCT 2014 | DOI: 10.1002/ceat.201300720

      Thumbnail image of graphical abstract

      The modified Pope-Peachy method, a resolution technique, is applied to realize the organic solvent-free chiral resolution of two racemic acids using supercritical CO2 as reaction medium. A fast reaction system is presented and in vacuo and in situ methods to achieve enantiomer separation of the racemic acids are compared. Good enantioselectivities were obtained in a single step.

  2. Research Articles

    1. Applicability of Metals as Liner Materials for Ammonoacidic Crystal Growth

      Benjamin Hertweck, Shiyu Zhang, Thomas G. Steigerwald, Nicolas S. A. Alt, Rainer Niewa and Eberhard Schluecker

      Article first published online: 8 OCT 2014 | DOI: 10.1002/ceat.201400414

      Thumbnail image of graphical abstract

      Ammonothermal reactors mainly consist of nickel base alloys. Despite their corrosion resistance, substantial degeneration of the alloys especially under ammonoacidic conditions occurs. Screening tests demonstrate that galvanic noble metal coatings possess high potential as cost-effective liner technique for passivation of the complete autoclave including peripheral parts like sealing parts.

  3. Communications

    1. Supercritical CO2 Extraction of 1-Butanol and Acetone from Aqueous Solutions Using a Hollow-Fiber Membrane Contactor

      Teresa Moreno, Stephen J. Tallon and Owen J. Catchpole

      Article first published online: 8 OCT 2014 | DOI: 10.1002/ceat.201300700

      Thumbnail image of graphical abstract

      The porocritical extraction process combines the porosity of hollow fibers with the properties of supercritical fluids to create a nondispersive contact between solvent and aqueous feed and is particularly suited for the recovery of organic compounds from aqueous solutions. 1-Butanol and acetone were extracted from a model aqueous solution containing concentrations typically found in fermentation broths.

    2. Influence of scCO2, Ultrasound, and Quaternary Ammonium Salt on Gelation Time and Structural Characteristics of Silica

      Alina-Mihaela Hanu, Sabine Kareth, Angela Puls, Mihaela Ivanova, Bert Mallick, Anja-Verena Mudring and Marcus Petermann

      Article first published online: 8 OCT 2014 | DOI: 10.1002/ceat.201300722

      Thumbnail image of graphical abstract

      The potential applications of silica aerogels in adsorption and catalysis are closely related to their nanostructure, pore size, and pore shape. The proposed one-step synthesis of silica aerogels employing supercritical CO2 and ultrasound as well as choline chloride as quaternary ammonium salt is a proper way to reduce the gelation time and to design porous materials with tailor-made properties.

  4. Research Articles

    1. Transparent and Inexpensive Microfluidic Device for Two-Phase Flow Systems with High-Pressure Performance

      Nayane Macedo Portela da Silva, Jean-Jacques Letourneau, Fabienne Espitalier and Laurent Prat

      Article first published online: 8 OCT 2014 | DOI: 10.1002/ceat.201400028

      Thumbnail image of graphical abstract

      Coupling high-pressure processes with microtechnology provides decisive advantages for different fields of applications. A low-cost, transparent, and easily optically accessible high-pressure microdevice is developed. The applied strategies enable fast process control and detection and permit the generation of homogeneous operation conditions and a stable two-phase flow under high-pressure performance.

    2. Oiling-Out and Crystallization of Vanillin from Aqueous Solutions

      Thore J. Sorensen

      Article first published online: 8 OCT 2014 | DOI: 10.1002/ceat.201400201

      Thumbnail image of graphical abstract

      Crystallization and its relation to oiling-out or liquid-liquid phase-separation are subjected to an ongoing discussion. The accepted classical crystallization theory is under debate. The results from dynamic light scattering experiments performed on precrystalline liquid solutions with the solute vanillin are believed to contribute to an eventually new or extended crystallization theory.

    3. Mathematical Modeling of Hydrogen Production via Methanol-Steam Reforming with Heat-Coupled and Membrane-Assisted Reactors

      Rei-Yu Chein, Yen-Cho Chen and Jacob Nan-Chu Chung

      Article first published online: 8 OCT 2014 | DOI: 10.1002/ceat.201400224

      Thumbnail image of graphical abstract

      Hydrogen production from reforming hydrocarbon fuels may constitute a possible solution to distribution and storage problems of hydrogen. A 1D non-isothermal mathematical model is established for analyzing hydrogen production via methane steam reforming in a methane reformer coupled with a combustor. Under optimized conditions, hydrogen removal from the reformer and methanol conversion could be enhanced.

    4. Breakage Probability of Stressed Granules Using a Degradation Model

      Salman, Sergej Aman and Jürgen Tomas

      Article first published online: 8 OCT 2014 | DOI: 10.1002/ceat.201400230

      Thumbnail image of graphical abstract

      A degradation model is developed. The model is applied to determine the breakage behavior of inhomogeneous granules. It is verified by simulation analysis and experiments. Monte-Carlo data with normal distributed breakage forces is fitted. The breakage probability is calculated by considering the configuration of stressing contact points.

    5. Semi-Empirical Model for Limestone Dissolution in Adipic Acid for Wet Flue Gas Desulfurization

      Lawrence Koech, Hilary Rutto, Ray Everson and Hein Neomagus

      Article first published online: 8 OCT 2014 | DOI: 10.1002/ceat.201400248

      Thumbnail image of graphical abstract

      The SO2 removal efficiency of wet flue gas desulfurization systems using limestone as sorbent can be improved by addition of various organic acids. The dissolution kinetics of limestone in adipic acid was investigated. The effects of decisive process variables were determined and a semi-empirical model was developed for the process. The dissolution of limestone follows a shrinking core model with chemical reaction control.

    6. Iron Oxide/Polymer-Based Nanocomposite Material for Hydrogen Sulfide Adsorption Applications

      Oliver Blatt, Martin Helmich, Bastian Steuten, Sebastian Hardt, Dieter Bathen and Hartmut Wiggers

      Article first published online: 8 OCT 2014 | DOI: 10.1002/ceat.201400303

      Thumbnail image of graphical abstract

      A promising approach to develop new adsorbents is the usage of nanoscale materials. An innovative adsorbent for desulfurization application was prepared by synthesizing a carbonaceous, porous structure with embedded nanoparticles, creating a FexOy nanoparticle/polystyrene composite. The obtained adsorbent provided a significantly higher capacity for H2S adsorption at room temperature.

    7. Nutrient Management in Processing of Steam-Exploded Lignocellulose Phytomass

      Josef Maroušek, Simona Hašková, Robert Zeman, Jan Váchal and Radka Vaníčková

      Article first published online: 8 OCT 2014 | DOI: 10.1002/ceat.201400341

      Thumbnail image of graphical abstract

      Energy production from phytomass residues is generally accepted as a promising and sustainable way. Two conventional methods of nutrient management and a recently proposed method, which considers the availability of nutrients, were compared. As a result, the application of the newly proposed method provides great potential for further optimization, which may lead to significant reductions in energy price.

    8. Determination of the Collision Probability between Bubbles and Nonspherical Particles in Flotation

      Oleg M. Sokovnin, Nina V. Zagoskina and Sergey N. Zagoskin

      Article first published online: 6 OCT 2014 | DOI: 10.1002/ceat.201400166

      Thumbnail image of graphical abstract

      For a particle suspended in an aqueous medium to be captured, the rising bubble must first collide with this particle. A new mathematical model of the collision probability between bubbles and non-spherical particles is proposed, considering the stochastic orientation of the particles with respect to the bubbles surface. The results are compared with previous theories and experimental data.

    9. Activity and Stability of Lipase Preparations from Penicillium corylophilum: Potential Use in Biocatalysis

      Cintia M. Romero, Mario D. Baigorí, Alessandra Machado Baron, Nadia Krieger and Licia M. Pera

      Article first published online: 6 OCT 2014 | DOI: 10.1002/ceat.201300851

      Thumbnail image of graphical abstract

      By manipulating the culture conditions of Penicillium corylophilum it is possible to produce biocatalysts with different enzymatic properties, which could be applied in a diverse range of industrial processes. Combining these potentially cost-effective biocatalysts with high ethanol or butanol enzyme tolerance, significant cost reduction could be expected for ecofriendly processes of biodiesel production.

    10. Extraction Behavior of Lipids Obtained from Spent Coffee Grounds Using Supercritical Carbon Dioxide

      Nalan A. Akgün, Hakan Bulut, Ireneo Kikic and Dario Solinas

      Article first published online: 1 OCT 2014 | DOI: 10.1002/ceat.201400237

      Thumbnail image of graphical abstract

      Response surface methodology was applied to optimize the supercritical carbon dioxide (sc-CO2) extraction of lipids from spent coffee grounds. The newly developed method for gas chromatographic analysis of sterols and tocopherols demonstrates that sc-CO2 extraction is a feasible method for the extraction of lipids and high value-added compounds from residues/by-products like spent coffee grounds.

  5. Communications

    1. Kinetics of Heterogeneous Biodiesel Synthesis Using Supported ZnO as Catalyst

      Ivana Lukić, Željka Kesić and Dejan Skala

      Article first published online: 1 OCT 2014 | DOI: 10.1002/ceat.201300714

      Thumbnail image of graphical abstract

      Reaction kinetics of heterogeneously catalyzed methanolysis is usually described by a first-order kinetic model. The catalyst was synthesized by a one-step sol-gel method. The kinetics of this process was determined and simulation with obtained rate constants performed to check whether first-order irreversible or reversible reaction models could describe the reaction kinetics.

  6. Research Articles

    1. Foaming Process from Polystyrene/p-Cymene Solutions Using CO2

      Cristina Gutiérrez, Juan F. Rodríguez, Ignacio Gracia, Antonio de Lucas and Maria T. García

      Article first published online: 31 JUL 2014 | DOI: 10.1002/ceat.201300780

      Thumbnail image of graphical abstract

      The foaming of polystyrene to achieve microcellular structure was performed at room temperature using an environmentally friendly technology. Low temperatures are required due to the presence of p-cymene, a terpene oil which increases the mobility of the polymeric chains. The foam structure can be tailored by altering pressure and temperature.

  7. Communications

    1. Corrosive Degeneration of Autoclaves for the Ammonothermal Synthesis: Experimental Approach and First Results

      Benjamin Hertweck, Thomas G. Steigerwald, Nicolas S. A. Alt and Eberhard Schluecker

      Article first published online: 30 JUL 2014 | DOI: 10.1002/ceat.201300719

      Thumbnail image of graphical abstract

      Alloy 718, a material of high corrosion resistance, degenerates in supercritical ammonia with acidic mineralizers. EDX spectroscopy in combination with optical microscopy and micro indentation is a suitable tool for analyzing the corrosion behavior and allows a detailed investigation of the corrosion phenomena for Alloy 718 under ammonothermal conditions.

  8. Research Articles

    1. Processing of Lovage into High-Value Components Using Supercritical CO2 and Pressurized Liquid Extraction

      Aurelija Kemzūraitė, Petras R. Venskutonis and Diana Navikienė

      Article first published online: 3 JUL 2014 | DOI: 10.1002/ceat.201300735

      Thumbnail image of graphical abstract

      High-pressure techniques, namely supercritical CO2 and pressurized liquid extraction, demonstrate the potential to significantly increase the efficiency of processing of different anatomical parts of lovage into high-value fractions based on their solubility in nonpolar (CO2) and protonic (methanol/water) solvents under supercritical and subcritical conditions.

  9. Communications

    1. Sterilization of Medical Products from Collagen by Means of Supercritical CO2

      Volker Herdegen, Alexander Felix, Roland Haseneder, Jens-Uwe Repke, Kathrin Leppchen-Fröhlich, Ina Prade and Michael Meyer

      Article first published online: 6 JUN 2014 | DOI: 10.1002/ceat.201300679

      Thumbnail image of graphical abstract

      Due to its favorable properties, collagen is increasingly used in medical devices. Nowadays, the necessary sterilization of this sensitive material may be conducted only by ethylenoxide and γ irradiation. To overcome the drawbacks connected to those methods, a new sterilization procedure using supercritical CO2 and the addition of small amounts of sterilization aid is successfully tested.

  10. Research Articles

    1. Simulating Supercritical Water Jets with a Variable Turbulent Prandtl Number

      Martin J. Schuler, Tobias Rothenfluh, Panagiotis Stathopoulos, Dragana Brkic, Thierry Meier and Philipp Rudolf von Rohr

      Article first published online: 8 MAY 2014 | DOI: 10.1002/ceat.201300661

      Thumbnail image of graphical abstract

      Due to the strongly varying fluid properties of water around the pseudo-critical point, difficulties in simulating the thermal field of submerged supercritical water jets were detected. A locally varying turbulent Prandtl number was implemented to significantly improve numerical predictions with respect to axial temperature measurements

VIEW

  1. 1 - 20

SEARCH

SEARCH BY CITATION