Biodiesel production from high acid value waste frying oil catalyzed by superacid heteropolyacid

Keywords: Biodiesel, Base catalyst, Waste Fried Oil, Orthogonal design Abstract: In this article the biodiesel production procedure of base-catalyzed esterification was studied, and the optimal conditions of preparation were brought up. By applying orthogonal design, the optimal conditions of base-catalyzed esterification from waste frying oil with acid value of 4 mg/l KOH were: methanol/oil ratio, 8:1; catalyst dose, 1% oil weight; temperature, 85°C; reaction time, 1.5 h. The maximum oil conversion rate of 90% was achieved. The influence of each factor on the oil production in descending order was: methanol/oil ratio > catalyst dose > temperature > reaction time. The biodiesel refinement was carried out with three types of rinsing solutions: distilled water, satirized NaCl solvent and glacial acetic acid. Rinsing times, soap removing rate and final acid value of the biodiesel were considered as the critical factors in evaluating the effectiveness of the rinsing solution on the biodiesel refinement. The results turned out that the most suitable rinsing method for industrial application was rinsing with saturated NaCl solvent.

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Enzymatic Transesterification of Waste Frying Oil from Local Restaurants in East Colombia Using a Combined Lipase System

Applied Sciences ◽

10.3390/app10103566 ◽

2020 ◽

Vol 10 (10) ◽

pp. 3566

Author(s):

Mary Angélica Ferreira Vela ◽

Juan C. Acevedo-Páez ◽

Nestor Urbina-Suárez ◽

Yeily Adriana Rangel Basto ◽

Ángel Darío González-Delgado

Keyword(s):

Reaction Time ◽

Methyl Esters ◽

Enzyme Concentration ◽

Operating Conditions ◽

Frying Oil ◽

Biodiesel Production ◽

Optimum Operating ◽

Waste Frying Oil ◽

Production Chain ◽

Enzymatic Transesterification

The search for innovation and biotechnological strategies in the biodiesel production chain have become a topic of interest for scientific community owing the importance of renewable energy sources. This work aimed to implement an enzymatic transesterification process to obtain biodiesel from waste frying oil (WFO). The transesterification was performed by varying reaction times (8 h, 12 h and 16 h), enzyme concentrations of lipase XX 25 split (14%, 16% and 18%), pH of reaction media (6, 7 and 8) and reaction temperature (35, 38 and 40 °C) with a fixed alcohol–oil molar ratio of 3:1. The optimum operating conditions were selected to quantify the amount of fatty acid methyl esters (FAMEs) generated. The highest biodiesel production was reached with an enzyme concentration of 14%, reaction time of 8 h, pH of 7 and temperature of 38 °C. It was estimated a FAMEs production of 42.86% for the selected experiment; however, best physicochemical characteristics of biodiesel were achieved with an enzyme concentration of 16% and reaction time of 8 h. Results suggested that enzymatic transesterification process was favorable because the amount of methyl esters obtained was similar to the content of fatty acids in the WFO.

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