THE EFFECT OF EXPELLER PRESS OPERATIONAL PARAMETERS ON OLIVE POMACE OIL EXTRACTION

Document Type : Original Article

Authors

1 Assist. Lect., Ag. Eng. Res. Inst, ARC, Dokkie, Giza, Egypt.

2 Prof., Ag. Eng. Dept., Fac. of. Ag., Suez Canal U., Egypt.

3 Prof., Ag. Eng. Res. Inst, ARC, Dokkie, Giza, Egypt.

Abstract

An investigation was carried out on the effect of expeller press operational parameters such as screw speeds (20, 30, 40 and 50 rpm) and nozzle diameter (8,10 and 12 mm) on olive pomace oil extraction in order to determine the optimum operating conditions of oil expeller for maximum yield. The obtained results showed that, the oil yield and extraction efficiency had a negative relationship with the nozzle diameter and screw speed. However, a positive relationship was detected with the throughput capacity. The increase in screw speed was observed to increase the oil extraction rate and cake output but decrease the extraction loss. However, the increase in nozzle diameter increased the extraction loss and cake output but decreased the extraction rate. The extraction time was decreased by increasing the screw speed and nozzle diameter. Analysis of results showed that, the highest pomace oil yield was obtained at screw speed of 20 rpm and nozzle diameter of 8 mm with operational cost of 27.57 LE/h. No effect of the operating parameters on oil quality was observed. The result of this study revealed the possibility of extracting oil from the dried pomace by using the screw-type oil expeller.

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