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Ultrasound-assisted in-situ transesterification of wet Aurantiochytrium sp. KRS 101 using potassium carbonate

Author:
Sung, Mina, Han, Jong-In
Source:
Bioresource technology 2018 v.261 pp. 117-121
ISSN:
0960-8524
Subject:
biomass, catalysts, mass transfer, microalgae, potassium carbonate, sonication, transesterification, ultrasonic treatment, water content
Abstract:
A new in-situ transesterification method was developed for wet biomass: K2CO3 was used as an alkaline catalyst and, Aurantiochytrium sp. KRS 101 as oleaginous DHA-producing microalgae. It was found that the presence of water greatly impaired the overall efficiency even with the powerful catalyst that had worked surpassingly well with dry biomass, and thus a mechanical aid like ultrasonication was needed to make advantage of full potential of the alkaline catalyst. The total fatty acid ethyl ester (FAEE) recovery yield of 94.6% was achieved with sonication at 100 g/L of biomass (40% moisture), 3% of K2CO3, 70 °C and 30 min. All these suggest that the ultrasound assisted in-situ transesterification can offer a feasible means for FAEE recovery and it was so by way of overcoming the physical limitation of mass transfer caused the presence of water and providing effective contacts between reactants.
Agid:
6344060