Chemical Engineering & Technology

Cover image for Vol. 37 Issue 8

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

Editors' Choice

Every month, the Editors select two papers referring to current discussions in the scientific, public and economic communities and in view of the potential for further developments. The papers are freely accessible for one month.

Continuous Polycondensation Process

July 06, 2014

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The market for aliphatic polyester polyols is dominated by broad application in areas such as elastomers and coatings. Aliphatic polyester polyols are macroglycols prepared by polymerization of glycols and aliphatic dicarboxylic acids via batch processes in large-scale operations. As one of the most important and large-scale produced aliphatic polyester polyols, polyethylene adipate (PEA) is typically made from adipic acid and ethylene glycol through two stages: esterification and polycondensation. In spite of the growing demand of PEA and other aliphatic polyester polyols, a continuous polycondensation process for their manufacture has not been reported. Ling Zhao et al. efficiently performed a continuous polycondensation process for low-molecular-weight PEA manufacture in a six-column-tray counter-current column bubbling reactive distillation tower (BRDT) reactor under partial vacuum. The demo setup and the mathematical model for the continuous polycondensation process of PEA in the BRDT were assessed to study the feasible operation region. Under these optimized reaction conditions, the carboxyl end group concentration and the number average molecular weight met well the requirements for an industrial PEA product.


Zhenhao Xi, Like Chen, Wenjun Sun, Ling Zhao*,Weikang Yuan
Optimization of the Continuous Polycondensation Process for Polyethylene Adipate
Chem. Eng. Technol. 2014, 37 (7), 1163-1169.
DOI: 10.1002/ceat.201300540



 

Porous Perovskite Fibers

July 06, 2014

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Fiber-based catalytic support materials have gained increasing interest within the last decades due to their process intensification potential. The structures built from small-diameter fibers offer high surface-to-volume ratios combined with a void bed structure. This allows the counter-current trends of mass transfer and pressure drop to be adjusted over a wide range, making them interesting catalyst structures for many applications. In contrast to the widespread application of ceramic supports like pellets and honeycombs in industry, publications on structures based on ceramic fibers are rather scarce. But especially porous fibers offering high surface areas could be advantageous new catalysts or catalyst supports. Sandy Kaiser et al. presented the preparation of porous perovskite fibers and their application for CO oxidation. Porous fibers made from LaMnO3 could be fabricated by phase inversion spinning. The applicability of the prepared LaMnO3 fibers as catalyst for CO oxidation was proven. The presented preparation process can be expanded to other perovskites as well as to inert ceramic powders. By impregnation of the resulting fibers with catalytically active species, e.g., noble metals, a wider range of applications as catalytic material seems possible.


Sandy Kaiser*, Erik Reichelt, Sylvia E. Gebhardt, Matthias Jahn, Alexander Michaelis
Porous Perovskite Fibers – Preparation by Wet Phase Inversion Spinning and Catalytic Activity
Chem. Eng. Technol. 2014, 37 (7), 1146-1154.
DOI: 10.1002/ceat.201400097



 

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