Green Chemistry Blog

Scientists from Germany have optimized and assessed the ecological performance of a whole-cell two-liquid phase biocatalytic epoxidation of styrene.

Bruno Bühler and colleagues from the Technical University of Dortmund and Saarland University, Germany, considered how the ecological aspects of this reaction could be improved.  Currently, the ecological performance is hampered by the organic carrier solvent employed (bis(2-ethylhexyl)phthalate) which is toxic to humans and is produced from non-renewable resources.  Instead ethyl oleate (a biodiesel constituent) was tested and shown to be an environmentally attractive and cost-competitive solvent.

The authors also replaced the carbon/energy source glucose with glycerol as the latter is a waste product from the biodiesel and soap industries and thus cheap and abundant.  However, the use of glycerol was found to reduce the overall ecological and economic performance of the process.  The work presented here by Bühler and co-workers illustrates the capability of these assessments to identify critical process parameters and to enable systematic development towards industrial implementation.

This article is free to access until the 24th February 2012!  Click on this link below to find out more…

Systematic optimization of a biocatalytic two-liquid phase oxyfunctionalization process guided by ecological and economic assessment, Daniel Kuhn, Mattijs K. Julsing, Elmar Heinzle and Bruno Bühler, Green Chem., 2012, DOI: 10.1039/C2GC15985F

You may find this article of interest too – also free to access until the 24th February 2012, so why not take a look…

Intensification and economic and ecological assessment of a biocatalytic oxyfunctionalization process, Daniel Kuhn, Muhammad Abdul Kholiq, Elmar Heinzle, Bruno Bühler and Andreas Schmid, Green Chem., 2010, 12, 815-827

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Scientists from Spain report tailor-made collagen biopolymers from tanning waste with diverse shapes such as fibers, films and sponges. 

Mercedes Catalina (Advanced Chemistry Institute of Catalunya), Rafael Luque (University of Cordoba) and colleagues valorised tanning waste from leather processing to give biopolymers which could be easily modified using various methodologies with the aim of generating waste-derived renewable biopolymers.  For example, introducing cross-linking agents on the  matrix network of the biopolymer provided a material with improved properties.  The authors envisage these materials could have promising in fields such as cosmetics and medicines.

This article is free to access until the 18th February 2012! Click on the link below to find out more…

Tailor-made biopolymers from leather waste valorisation, Mercedes Catalina, Jaume Cot, Alina Mariana Balu, Juan Carlos Serrano-Ruiz and Rafael Luque, Green Chem., 2012, DOI: 10.1039/C2GC16330F

You may find this review article of interest too which is also free to access.  Why not take a look…

Waste materials – catalytic opportunities: an overview of the application of large scale waste materials as resources for catalytic applications, M. Balakrishnan, V. S. Batra, J. S. J. Hargreaves and I. D. Pulford, Green Chem., 2011, 13, 16-24

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Soy- and linseed oil-based polyurethanes were synthesized by curing carbonated soybean and linseed oils with different diamines. 

Moritz Bähr and Rolf Mülhaupt from the Freiburg Materials Research Center (FMF) and Department of
Macromolecular Chemistry, Germany, have developed a non-isocyante route to soy- and linseed oil-based polyurethanes.  The route involved conversion of the epoxidised seed oils with carbon dioxide to form cyclic carbonates catalysed by tetra-butylammonium bromide and silica supported 4-pyrrolidinopyridium iodide.  The catalysts could be easily recovered without needing traditional solvent extraction.  The resulting carbonates were then cured with various amines to give the polyurethanes.

As well as avoiding the use of toxic chemicals, this route also led to some polkyurethanes with increased glass transition temperatures and improved stiffness.  To find out more, just click on the article link below.  This article is currently free to access until the 15th February 2012!

Linseed and soybean oil-based polyurethanes prepared viathe non-isocyanate route and catalytic carbon dioxide conversion, Moritz Bähr and Rolf Mülhaupt, Green Chem., 2012, DOI: 10.1039/C2GC16230J

You may also find these articles of interest – free to access until the 15th February 2012 too!  So why not take a look…

Biorenewable polyethylene terephthalate mimics derived from lignin and acetic acid, Laurent Mialon, Alexander G. Pemba and Stephen A. Miller, Green Chem., 2010, 12, 1704-1706

Vegetable oil-based polymeric materials: synthesis, properties, and applications, Ying Xia and Richard C. Larock, Green Chem., 2010, 12, 1893-1909

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A recently published Green Chemistry aricle by David Cole-Hamilton (University of St. Andrews, UK), Stefan Mecking (University of Konstanz, Germany) and colleagues has just been featured in the latest issue of Chemistry & Engineering News (C&EN). 

The paper reports the synthesis of the diester dimethyl 1,19-nonadecanedioate from the palladium catalysed methoxycarbonylation of various commerial oils, including olive and sunflower oils.  The resulting product can then be easily converted to the diol and diacid, and all three chemicals can serve as useful polymer precursors. 

This article is now free to access until the 15th February 2012!  Click the link below to find out more…

Polymer precursors from catalytic reactions of natural oils, Marc R. L. Furst, Ronan Le Goff, Dorothee Quinzler, Stefan Mecking, Catherine H. Botting and David J. Cole-Hamilton, Green Chem., 2012, DOI: 10.1039/C1GC16094J

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