| Abstract | A real sample of waste cooking oil having an acidity of 8 mgKOH/goil and a water content of 700 ppm was efficiently converted into biodiesel. The process consisted in a two-step reaction: a preliminary treatment with AlCl3·6H2O to convert free fatty acids into the respective methyl esters, followed by alkaline transesterification using KOH as a catalyst. In detail, pretreatment with AlCl3·6H2O (345 K, 4 h, weight ratio MeOH:oil:catalyst of 1:3:0.01) allowed to obtain an efficient conversion of starting free fatty acid into the relevant fatty acid methyl esters (yield > 95%). After the reaction a convenient separation of phases was obtained. Two different phases were isolated: an oily phase with a methanol content of 7 % wt, in which methyl esters were dissolved in, with most of glycerides and with a very limited content of water to one side, and a lighter phase, in which most of unreacted methanol and catalyst together with water were solubilized. Such a separation made possible the direct use of the pretreated oily phase with AlCl3·6H2O in the transesterification without any further treatments, unless to adequate the methanol content. KOH was used to complete the conversion in the second step. Reaction occurred completely in 4 hours and the final biodiesel was conform to EN14214. |
| Text | 421004 2019 10.34049/bcc.51.B.022 Scopus 2 s2.0 85078845081 Biodiesel waste cooking oils esterification transesterification An economically viable two step process for biodiesel production from waste cooking oils Errico M.; Pastore C. University of Southern Denmark, Department of Chemical Engineering, Biotechnology and Environmental Technology, Campusvej 55, Odense M, 5230, University of Southern Denmark, Department of Chemical Engineering, Biotechnology and Environmental Technology, Campusvej 55, 5230 Odense M, Denmark, , Denmark; Water Research Institute, National Research Council, Viale De Blasio 5, Bari, 70132, Water Research Institute, National Research Council, Viale De Blasio 5, 70132 Bari, Italy, , , Italy; Water Research Institute, National Research Council, Viale De Blasio 5, Bari, 70132, Water Research Institute, National Research Council, Viale De Blasio 5, 70132 Bari, Italy, , , Italy A real sample of waste cooking oil having an acidity of 8 mgKOH/goil and a water content of 700 ppm was efficiently converted into biodiesel. The process consisted in a two step reaction a preliminary treatment with AlCl3·6H2O to convert free fatty acids into the respective methyl esters, followed by alkaline transesterification using KOH as a catalyst. In detail, pretreatment with AlCl3·6H2O 345 K, 4 h, weight ratio MeOH oil catalyst of 1 3 0.01 allowed to obtain an efficient conversion of starting free fatty acid into the relevant fatty acid methyl esters yield > 95% . After the reaction a convenient separation of phases was obtained. Two different phases were isolated an oily phase with a methanol content of 7 % wt, in which methyl esters were dissolved in, with most of glycerides and with a very limited content of water to one side, and a lighter phase, in which most of unreacted methanol and catalyst together with water were solubilized. Such a separation made possible the direct use of the pretreated oily phase with AlCl3·6H2O in the transesterification without any further treatments, unless to adequate the methanol content. KOH was used to complete the conversion in the second step. Reaction occurred completely in 4 hours and the final biodiesel was conform to EN14214. 51 Published version http //www.scopus.com/record/display.url eid=2 s2.0 85078845081 origin=inward Articolo in rivista Bulgarian Academy of Sciences 0861 9808 Bulgarian Chemical Communications Bulgarian Chemical Communications Bulg. Chem. Commun. carlo.pastore PASTORE CARLO IProPBio Integrated Process and Product Design for Sustainable Biorefineries DTA.AD002.032.005 IMAGE IGG FIRENZE |
