Hot water flotation
Hot water flotation is a traditional method in Uganda
and Sudan for the extraction of sesame oil. The
following is a description of a laboratory method, as
details of the traditional method have not been
located. Sesame seed is ground to a paste and
heated to 80-90°C for 15 min. Enough boiling water is
then added to suspend the ground seed on stirring.
The mixture is boiled with stirring for 15 min. After
cooling the upper oil layer is separated off and dried
by heating. The oil recovery from 0.5 kg seed is 108
ml, equivalent to an oil extraction efficiency of 41%.
(Natural Resources Institute , 1995).