Modeling and optimisation of oil recovery and throughput capacity in mechanically expressing oil from African oil bean (
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ORIGINAL ARTICLE
Modeling and optimisation of oil recovery and throughput capacity in mechanically expressing oil from African oil bean (Pentaclethra macrophylla Benth) kernels C. A. Ogunlade1 • A. K. Aremu2
Revised: 28 February 2020 / Accepted: 8 April 2020 Ó Association of Food Scientists & Technologists (India) 2020
Abstract The relationship existing between operating parameters like speed of operation, applied pressure, feed rate and dependent variables like oil recovery and throughput capacity was investigated while mechanically expressing oil from kernels of Pentaclethra macrophylla. A 3-factor, 5-levels central composite design of response surface methodology was used for modeling and optimization of the process. The speed was varied over 15, 30, 45, 60 and 75 rpm using pulley arrangement, applied pressure was varied over 5, 10, 15, 20 and 25 MPa by adjusting the wormshaft distance of the oil expeller and the feed rate was varied over 100, 200, 300, 400 and 500 g/min by regulating the quantity of kernels fed into the expeller. Developed models were validated by comparing predicted values with experimental values. In optimizing the process, the oil recovery and throughput capacity were maximized while the independent variables were set at ranges. Optimum oil recovery of 73.2% and throughput capacity of 4.18 kg/h was obtained at 45 rpm speed of operation, 20 MPa applied pressure and 300 g/min feed rate. A quadratic polynomial model was developed for the oil recovery while a two-factorial-interaction model was developed for the throughput capacity. The results showed that speed of operation, applied pressure and feed rate had significant influence on the oil recovery and throughput capacity. The models developed were valid as they showed a good
& C. A. Ogunlade [email protected]; [email protected] 1
Department of Agricultural Engineering, Adeleke University, Osun State, Ede, Nigeria
2
Department of Agricultural and Environmental Engineering, University of Ibadan, Ibadan, Nigeria
agreement between the variable due to low variations between calculated and predicted values. Keywords Operating parameters Applied pressure Speed Feed rate Oil recovery Throughput capacity
Introduction Vegetable oil has become a very important component of food and non food industries (Ogunlade and Aremu 2019), there is presently an increasing universal demand for good quality vegetable oil because of their nutritional, pharmaceutical and industrial applications thus, studies on vegetable oil to meet its demand in the human society are essential. The present production rate of vegetable oil in Nigeria is inadequate to meet the demand of her citizenry (Obi 2013), this has led to the supply of oils of varying qualities to the Nigerian market with some posing various health risks. It is essential to investigate the quality and quantity of oil from some unexploited and underutilized oilseeds to make more oils available for human nutrition, bio-power, enhance food security and reduce the wide ga
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