naa a22 4500 51082126X CHVBK 20180411083533.0 cr unu---uuuuu 180411e20130201xx s 000 0 eng 10.1007/s11814-012-0159-0 doi (NATIONALLICENCE)springer-10.1007/s11814-012-0159-0 Epoxidation of waste used-oil biodiesel: Effect of reaction factors and its impact on the oxidative stability [Elektronische Daten] [Chainarong Kongyai, Benjapon Chalermsinsuwan, Mali Hunsom] Epoxidation of waste used-oil biodiesel (WUO-B) was performed to test the feasibility of properties improvement. The effects of the reaction temperature (30-50 °C) and time (2-12 h), molar ratio of H2O2: HCOOH (1: 7 to 1: 1) and the stirring rate (100-300 rpm) on the level of unsaturated carbon bond conversion and the epoxy compound selectivity were identified using a 2 k (two levels) factorial design. Besides epoxy biodiesel as the main product, only one by-product, hydroxyl-biodiesel, was generated. The conversion of unsaturated carbon bonds was positively affected by the molar ratio of H2O2: HCOOH and the stirring rate, while the reaction temperature and time had no significant affect (in the investigated ranges). In contrast, with respect to the epoxy compound selectivity, the stirring rate had a positive effect, while both the reaction temperature and time each had a negative effect. The oxidative stability (OS) of the epoxy waste used-oil biodiesel (EWUO-B) revealed a linear relationship to the unsaturated carbon bond conversion level, but no significant relationship to the epoxy compound selectivity. EWUO-B prepared from a 1: 1 molar ratio of H2O2: HCOOH at 50 °C with stirring at 300 rpm for 12 h exhibited a higher OS (around 37.85 h) than that of the WUO-B. Except for the cold flow properties and methyl ester content, all other key properties of the EWUOB were within the specifications of the EN14214 standard set by the Department of Energy Business. Korean Institute of Chemical Engineers, Seoul, Korea, 2012 Waste Used-oil Biodiesel nationallicence Epoxidation nationallicence Factorial Design nationallicence Oxidative Stability nationallicence Kongyai Chainarong Department of Chemical Technology, Faculty of Science, Chulalongkorn University, 254 Phayathai Rd., 10330, Bangkok, Thailand aut Chalermsinsuwan Benjapon Department of Chemical Technology, Faculty of Science, Chulalongkorn University, 254 Phayathai Rd., 10330, Bangkok, Thailand aut Hunsom Mali Department of Chemical Technology, Faculty of Science, Chulalongkorn University, 254 Phayathai Rd., 10330, Bangkok, Thailand aut Korean Journal of Chemical Engineering Springer US; http://www.springer-ny.com 30/2(2013-02-01), 327-336 0256-1115 30:2<327 2013 30 11814 https://doi.org/10.1007/s11814-012-0159-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11814-012-0159-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kongyai Chainarong Department of Chemical Technology, Faculty of Science, Chulalongkorn University, 254 Phayathai Rd., 10330, Bangkok, Thailand aut NATIONALLICENCE 700 1- Chalermsinsuwan Benjapon Department of Chemical Technology, Faculty of Science, Chulalongkorn University, 254 Phayathai Rd., 10330, Bangkok, Thailand aut NATIONALLICENCE 700 1- Hunsom Mali Department of Chemical Technology, Faculty of Science, Chulalongkorn University, 254 Phayathai Rd., 10330, Bangkok, Thailand aut NATIONALLICENCE 773 0- Korean Journal of Chemical Engineering Springer US; http://www.springer-ny.com 30/2(2013-02-01), 327-336 0256-1115 30:2<327 2013 30 11814 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer