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

Title Ultrasound-assisted in-situ transesterification of wet Aurantiochytrium sp. KRS 101 using potassium carbonate.
Authors M. Sung; J.I. Han
Journal Bioresour Technol
DOI 10.1016/j.biortech.2018.03.099
Abstract

A new in-situ transesterification method was developed for wet biomass: KCO 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 KCO, 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.

Citation M. Sung; J.I. Han.Ultrasound-assisted in-situ transesterification of wet Aurantiochytrium sp. KRS 101 using potassium carbonate.. Bioresour Technol. 2018;261:117121. doi:10.1016/j.biortech.2018.03.099

Related Elements

Potassium

Elemental PotassiumSee more Potassium products. Potassium (atomic symbol: K, atomic number: 19) is a Block S, Group 1, Period 4 element with an atomic weight of 39.0983. The number of electrons in each of Potassium's shells is [2, 8, 8, 1] and its electron configuration is [Ar] 4s1. The potassium atom has a radius of 227.2 pm and a Van der Waals radius of 275 pm. Potassium was discovered and first isolated by Sir Humphrey Davy in 1807. Potassium is the seventh most abundant element on earth. It is one of the most reactive and electropositive of all metals and rapidly oxidizes. As with other alkali metals, potassium decomposes in water with the evolution of hydrogen because of its reacts violently with water, it only occurs in nature in ionic salts.Potassium Bohr Model In its elemental form, potassium has a silvery gray metallic appearance, but its compounds (such as potassium hydroxide) are more frequently used in industrial and chemical applications. The origin of the element's name comes from the English word 'potash,' meaning pot ashes, and the Arabic word qali, which means alkali. The symbol K originates from the Latin word kalium.

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