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5.473 Aktuelle Fachpublikationen aus der Branche Verfahrenstechnik

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Morphology and rheological properties of silica‐filled poly(carbonate)/poly(methyl methacrylate) blends

14.11.2014 | Weizhen Li, Anne B. Spoelstra, Johannes G.P. Goossens, Polymer Engineering and Science, 2014

The effect of silica nanoparticles on the morphology and the rheological properties was investigated in the immiscible polymer blend poly(carbonate)/poly(methyl methacrylate) (PC/PMMA). In the melt state, the linear viscoelastic properties of the nanocomposite showed a reduction effect of the ...

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Extrusion film casting of long chain branched polypropylene

14.11.2014 | Kalyani Chikhalikar, Sourya Banik, Lal Busher Azad, Kishor Jadhav, Sunil Mahajan, Zubair Ahmad, Surendra Kulkarni, S ..., Polymer Engineering and Science, 2014

Extrusion film casting (EFC) is an important melt processing operation which is extensively used to make polypropylene (PP) films. Linear PP shows significant amount of necking and draw resonance during EFC. One of the ways to reduce necking is to introduce long chain branches (LCB) on the ...

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Influence of the drying route on the depolymerization and properties of chitosan

14.11.2014 | Mabel K. Arantes, Cristie L. Kugelmeier, Lucio Cardozo‐Filho, Marcos R. Monteiro, Clayton R. Oliveira, Helton J. Alves, Polymer Engineering and Science, 2014

In this work, a chitosan sample with a high degree of deacetylation (DD >95%) obtained from freshwater shrimp shells was subjected to drying processes in an electric oven and by supercritical CO2. The results indicated that drying chitosan particles with supercritical CO2 resulted in a very ...

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A Comprehensive Kinetic Study of the Reaction of SO2 with CaO by the Random Pore Model

14.11.2014 | Hadi Moshiri, Bahram Nasernejad, Habib Ale Ebrahim, Mahboobeh Taheri, Chemical Engineering & Technology, 2014

Abstract The kinetics of the reaction between CaO and SO2 was studied by the random pore model, to accurately consider the porous structure of the solid reactant. The inherent reaction rate constants and rate dependency with respect to the SO2 concentration were determined from the initial ...

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Formation of molecular nitrogen and hydrogen sulfide during high‐temperature pyrolysis of coals

14.11.2014 | Naoto Tsubouchi, Asia-Pacific Journal of Chemical Engineering, 2014

ABSTRACT Nitrogen and sulfur release from eleven coals during pyrolysis at high temperatures (≥1000 °C) was studied in both fixed‐bed and free‐fall quartz reactors. Yields of N2, char‐N and H2S were found to depend strongly on the pyrolysis conditions, such that N2 and H2S yields increased ...

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Hydrodynamic‐Analogy‐Based Modeling Approach for Distillative Separation of Organic Systems with Elevated Viscosity

13.11.2014 | Tim S. Wolf, Christian Bradtmöller, Stephan Scholl, Eugeny Y. Kenig, Chemical Engineering & Technology, 2014

Abstract A modeling approach based on hydrodynamic analogies is applied to predict the influence of elevated viscosity on the separation efficiency of distillation processes in structured packed columns. An advantage of this approach compared to traditional models based on the film theory is ...

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Particle Size Measurement of Metallic Iron in Reduced Materials Based on Optical Image Analysis

13.11.2014 | Yongsheng Sun, Yuexin Han, Peng Gao, Yufan Mu, Chemical Engineering & Technology, 2014

Abstract The size of metallic iron particles in coal‐based reduced materials was measured by optical image analysis in three different reduced samples. The obtained data were analyzed by frequency and cumulative distribution. The results reveal that optical image analysis successfully measured ...

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Replacement of CH4 in Hydrate in Porous Sediments with Liquid CO2 Injection

13.11.2014 | Yu Zhang, Li‐Jun Xiong, Xiao‐Sen Li, Zhao‐Yang Chen, Chun‐Gang Xu, Chemical Engineering & Technology, 2014

Abstract The dynamics of the replacement of CH4 in hydrate in porous sediments with liquid CO2 was investigated using a self‐developed experimental apparatus at different temperatures and initial pressures. The pressure increases steadily as the replacement reaction processes. The amount of ...

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Prediction of Air Specific Heat Ratios at Elevated Pressures Using a Novel Modeling Approach

13.11.2014 | Arash Kamari, Amir H. Mohammadi, Alireza Bahadori, Sohrab Zendehboudi, Chemical Engineering & Technology, 2014

Abstract An accurate and efficient model based on least‐squares support vector machines (LSSVM) is developed for the determination of air specific heat ratios at elevated pressures. Additionally, the coupled simulated annealing optimization strategy is used to calculate the optimal values of ...

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Development of a transfer model for the design and the operation of sodium purification systems for Fast Breeder Reactors

13.11.2014 | N. Khatcheressian, C. Latgé, X. Joulia, T. Gilardi, X. Meyer, The Canadian Journal of Chemical Engineering, 2014

Abstract Operating a Sodium Fast Reactor (SFR) in reliable and safe conditions requires mastering the quality of the sodium fluid coolant, regarding oxygen and hydrogen impurities contents. A cold trap is a purification unit in SFR, designed to maintain oxygen and hydrogen contents within ...

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