Abstract:
In the oil refining industry one of many steps is deacidification which aims to separate free fatty
acids and other components from edible oils.But this process has been implemented using steam
stripping which causes the loss of edible oil natural antioxidants due to high temperature.The
liquid-liquid extraction technique which carried out at lower temperature is preferable in order to
prevent the loss of nutritious components and saves energy.Using a green solvent called natural
deep eutectic solvent(NADE) such problem can be avoided.This is because the extraction is done
in much lower temperature in addition of being green technology.NADE are formed by combining
two or more hydrogen bond donor and acceptor compounds resulting a third component which
have lower melting point than the individual compounds.The present work reports mainly on the
influences of process variable variation on extraction yield by using NADE solvent composed of
betaine as hydrogen bond acceptor and 1,2 propanediol as hydrogen bond donor.Response surface
methodology was used to analyze the effect of four major process variables(Temperature, Time,
Mixing rate and Mixing ratio) and by using process optimization an improved free fatty
acids(FFAs) extraction yield of 49.3% were obtained at approximated value of 56
OC, 3hr,434rpm
and 1:3 ratio(oil to NADE).In addition to the major work, health related work on the effect of
saturated fatty acid rich oils on humans were also analyzed using Bahir Dar university medical
students with long stay in the school compound and the accusation on the negative health effect
of saturated fatty acid rich edible oils on human health have been disproven by pocket size blood
sample collection and lipid profile laboratory and statistical analysis
