Journal
CURRENT MICROWAVE CHEMISTRY
Volume 2, Issue 1, Pages 53-60Publisher
BENTHAM SCIENCE PUBL LTD
DOI: 10.2174/221333560201150212110805
Keywords
Calophyllum inophyllum oil; hydroformylation; internal olefins; ionic liquids; methyl oleate; microwave; phosphite renewable heterogeneous catalysts; rhodium; transesterification
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Funding
- Fundacao para a Ciencia e a Tecnologia (FCT), Portuguese Agency for Scientific Research [PEst-OE/QUI/UI0313/2014]
- FCT [QUI/112913/2009]
- COMPETE (Programa Operacional Factores de Competitividade) [QUI/112913/2009]
- QREN/FEDER [QUI/112913/2009]
- QREN/FEDER
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A comparative study on the transesterification of natural oils obtained from Calophyllum inophyllum seeds was carried out using homogeneous (NaOH/MeOH) or heterogeneous catalysts, with conventional heating and under microwave irradiation. The results show that the microwave-assisted reaction using heterogeneous catalysts, obtained from renewable sources (rice husk and egg shell ashes), constitutes an energetically sustainable approach for transesterification. In order to obtain value-added products from natural oils, rhodium/monophosphite catalysts were applied to the hydroformylation of methyl oleate, also under conventional heating or microwave irradiation. Using conventional heating conditions (T = 80 degrees C; P-syngas = 30 bar), high catalytic activity was observed with 98% chemoselectivity for aldehydes, while under microwave irradiation, using a CEM (R) Discover system equipped with syngas addition kit, high conversions were observed under mild reaction conditions (T = 60 degrees C; P-syngas = 10 bar), mainly with formation of isomerization products.
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