Download - Evonik Industries

More documents

Recommendations

Info

14 CAtALYsIs elements35 Issue 2|2011 Robust and selective: metathesis catalysts for oleochemical applications Metathesis plays a key role in oleochemistry to make renewable resources usable for the chemical industry. The metathesis catalysts used for this purpose must be robust and highly active to convert the raw material qualities, which are subject to frequent fluctuations and occasional contamination. The Evonik portfolio features two catalysts, catMETium® RF2 and catMETium® RF3, that can solve this difficult task. [ text Dr. Renat Kadyrov ] MetAtHesIs Is A chemical reaction in which four atoms receive new bonding affiliates in a single step. Depending on the sub strate combination, it is distinguished between ring-closing metathesis (RCM), cross-metathesis (CM) and ring-opening metathesis polymerization (ROMP). The development of well defined catalytic systems for metathesis reactions won the Nobel Prize in Chemistry in 2005. Today, metathesis is a highly significant method of the chemical industry, for instance in the development and production of modern plastics or of active pharmaceutical ingedients (fig. 1). Ring-closing metathesis is an elegant method for construction of macrocyclic ring systems and therefore is an indispensable reaction step in the synthesis of modern active pharmaceutical ingredients for the treatment of hepatitis C or cancer. Ring-opening metathesis polymerization is an effective method to produce specialty polymers for large, complex and corrosion-resistant components for automotive applications or chemical containers. In oleochemistry, metathesis reactions are used for functionalizing unsaturated fatty acid derivatives. Evonik markets metathesis catalysts under the name of catMETium® RF (fig. 2). All catalysts are based on unsaturated N-heterocyclic carbene Ru complexes (Ru-NHC). The catalysts all share the characteristics of high temperature stability, high turn-over numbers (TON), and high selectivity. The metathesis of olefins plays a particularly important role in oleochemistry, since this technology allows for direct access to renewable resources and for their efficient use without creating any by-products. For example, metathesis turns triglycerides and unsaturated fatty acid derivatives (from palm, soy, canola or sunflower oil) into fine chemicals, functionalized monomers, polymers, biodegradable lubricants and specialty chemicals such as cosmetics. Cross metathesis of unsaturated fatty acids and acid esters with functionalized olefins, allow for accessing a diversity of double-functionalized olefins. These represent interesting raw materials for creating macrocyclical compounds, polyesters, polyamides, lubricants or surfactants for example. On the other hand, the non-functional olefins that are generated in the same process can be further converted to α-olefins, oil field chemicals, lubricant additives and waxes. Highly prized robustness and stability at high temperatures Metathesis catalysts for oleochemistry applications must have special properties for operating economically. catMETium® RF2 and catMETium® RF3 meet these requirements. They stand out for high tolerance for a variety of raw material qualities, fulfill ing an essential prerequisite for the use of renewable resources in oleochemistry. The thermal stability of catMETium® RF catalysts represents another advantage, which is especially important in equilibrium-limited cross-metathesis 333
Figure 1 Application areas of olefin metathesis Figure 2 Evonik´s catMETium® RF product family Mes N N Mes Cl Cl Ru PCy 3 Ph Pharma Ring-closing metathesis Cross metathesis Mes N N Mes Cl Cl Ru PCy 3 S n + Ring-opening metathesis Me Mes N N Mes Cl Cl A A Ru PCy 3 Me + + S Y Y Cl Cl KAtALYse 15 Oleochemistry n Antiviral active ingredients Functionalized oligomers Dosing of active ingredients Polymer Dental materials Coatings Bulk and special polymers Ph Ph N N N Ph catMETium® RF1 catMETium® RF2 catMETium® RF3 catMETium® RF4 Ru PCy 3 S elements35 Issue 2|2011
Page 1 and 2: elements35 Quarterly Science Newsle
Page 3 and 4: All set for the future If your car
Page 5 and 6: Fiscal year 2010: the best result s
Page 7 and 8: Plans for isophorone plants in Chin
Page 9 and 10: no MACHIne, PLAnt, engine would be
Page 11 and 12: ior of a liquid, which always becom
Page 13: Influence of the engine oil on gas
Page 17 and 18: Almost 5,000 km across Australia Pi
Page 19 and 20: Study verifies effectiveness of con
Page 21 and 22: PLAstIC oR GLAss? This is the quest
Page 23 and 24: The façade of the Photovoltaics In
Page 25 and 26: its partners, Sunovation has develo
Page 27 and 28: foR YeARs, It was impossible to ima
Page 29 and 30: 333 particularly since the situatio
Page 31 and 32: Robust, flexible, and fast drying:

Download - Evonik Industries

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?