Vabilo na predavanje / Invitation to the Lecture

[Brigita Pirc]

VABILO NA INŠTITUTSKO PREDAVANJE / INVITATION TO THE INSTITUTE LECTURE

Prof. Dr. Nuray Oktar

Chemical Engineering Department, Gazi University, Ankara, Turkey
oktarnuray at gmail.com<mailto:oktarnuray at gmail.com>, nurayoktar at gazi.edu.tr<mailto:nurayoktar at gazi.edu.tr>

petek / Friday, 06. 11. 2015, ob / at 12:00
Velika predavalnica Kemijskega inštituta / Lecture Hall at the National Institute of Chemistry, Hajdrihova 19, Ljubljana

Conversion of Glycerol to Fuel Oxygenates Through Etherification Reactions

In order to maintain biodiesel production economically feasible, glycerol obtained as a by-product needs to be utilized in the production of valuable chemicals and fuels [1]. Etherification of glycerol with iso-olefins or tert-butyl alcohol (TBA) has been considered as an attractive route for its utilization [2,3]. In our studies, glycerol etherification was investigated with TBA, iso-butene (IB) and iso-amylene (IA), using resin type solid acid catalysts (A-15, A-16, A-36, A-35, DR-2030, Relite EXC8D, Lewatit K2629 etc.). Results proved the importance of pore diffusion resistance, swelling characteristics and thermal stabilities of the resins, as well as their Brønsted acidities, on their performance in glycerol etherification. The highest performance was obtained in the presence of Amberlyst 15, however, performance of A-36 and Relite EXC8D was comparable at higher temperatures. Although TBA has high dissolving capacity of glycerol, water produced as by-product had some negative effects on both the rate and equilibrium of glycerol etherification. Consequently, sorption-enhanced reaction improved conversion of glycerol to ethers. Both A-36 and Dowex DR-2030 showed excellent performance in etherification of glycerol with iso-butene at 90 oC. However, oligomerization of iso-butene caused inhibiting effect on the etherification yields.

Our recent work proved highly promising results for the etherification of glycerol with C5 reactive olefins over acidic resin catalysts. Results obtained over A-36 in a temperature range of 120-140 oC proved that glycerol conversion and di-ether selectivity values approaching to 100 and 70 %, respectively, could have been achieved in etherification of glycerol with iso-amylene. Comparison of the etherification results obtained in batch and flow reactors also proved the advantages of flow system. Here, a detailed review of our recent results on etherification of glycerol with TBA, iso-butene and iso-amylene will be reported.

Acknowledgements: TUBITAK, Gazi University Research Fund

References:
[1] Ozbay N., Oktar N., Dogu G., Dogu T., Ind. Eng. Chem. Res. 51(2012) 8788.
[2] Ozbay N., Oktar N., Dogu G., Dogu T., Int. J. Chem. React. Eng. 8 (2010) A18.
[3] Ozbay N., Oktar N., Dogu G., Dogu T., Topics Catal. 56 (2013) 1790.

Vljudno vabljeni! / Kindly invited!


Info: prof. dr. Albin Pintar; albin.pintar at ki.si<mailto:albin.pintar at ki.si>
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