Microwave PRE-Treatment for Improving Oil Recovery of Mechanical Extraction of Jatropha curcas L
Sebastian Romuli, Shkelqim Karaj, Joachim Müller
University of Hohenheim, Inst. of Agricultural Engineering, Tropics and Subtropics Group, Germany
Jatropha kernel contains up to 60 % of oil. Mechanical pressing of Jatropha kernel is an attractive technique to extract the oil. However, the process still has the drawback of low oil recovery efficiency caused by the high tenderness of the material. Thermal pre-treatment of kernel before pressing is seen as a relevant solution, because it increases the temperature of the material, that leads to higher temperature of press head and thus stimulates more oil to be mechanically extracted from the kernel. Among the existing treatments, microwave pre-treatment has received great interest because the heat generated from the electromagnetic field develops in the inner of the kernels and simultaneously inhibits hydrolysis triggered by the enzymes during pressing.
Keywords: Heat, Jatropha kernel, microwave pretreatment, oil recovery efficiency
Contact Address: Sebastian Romuli, University of Hohenheim, Inst. of Agricultural Engineering, Tropics and Subtropics Group, Garbenstraße 9, 70599 Stuttgart, Germany, e-mail: sebastian_romuliuni-hohenheim.de