Design and Fabrication of Groundnut (Arachis Hypogaea) Roaster cum Expeller

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Author(s) Olatunde O. B | E. A Ajav | Fatukasi S.O
Pages 177-184
Volume 3
Issue 3
Date March, 2014
Keywords Extractor, Groundnut, Oil yield, Process parameters, Roaster.

It is incumbent to find an effective, drudgery free and less expensive means of groundnut oil production. A combined groundnut roaster and oil extractor for medium scale expression of groundnut oil was designed, fabricated and tested to establish the influence of moisture content, heating time and temperature on percentage oil yield. The machine has a power rating of 5.5KW and extraction capacity of 4kg/hr with the screw shaft rotating at 60 revolutions per minute and a reduction gear to step down the speed of rotation to ratio of 25:1. The roaster was equipped with; a thermostat calibrated from 0-400oC, a stirrer to create even distribution of heat. Four moisture content levels (6, 7, 8 and 9% wet basis) and heating duration (10, 20, 25 and 30 minutes) were used for the evaluation at four temperature settings 70, 80, 90 and 100oC. The highest percentage oil yields were 41.6, 31.3, 25.5 and 21.2% at 6, 7, 8 and 9% moisture content wet basis respectively were all observed at 1000C with exception of 21.2% observed at 700C. The machine gave the highest oil yield of 41.6%, an equivalent of 92% when compared to 45% oil content of groundnut, at 100oC, 6% moisture content and heating time of 25minutes. The observed differences in percentage oil yield were found to be significant at 5% significance level. The overall cost of the machine was N160, 000, ($1066.7).

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