Mechanical extraction of jojoba oil [electronic resource].

Includes references.

A study was carried out to detennine the proper condition for mechanical extracting of jojoba oil using laboratory scale hydraulic press. The experimental work was conducted under two different seeds conditions (whole and crushed seeds), six different piston pressures (75, 150, 225, 300, 375 and 450 bar) that equal ( 61, 123,184, 246, 307, 368 bar) as actual pressure over the surface of mats having jojoba seeds and six different holding times (20, 40, 60, 80, 100 and 120, min). The results show that, the maximum percentage of extracted oil was obtained at heating temperature of 60 oC and holding time of 30 mints for both whole and crushed seeds conditions. The mesh size of8 and 10 mesh ( 2 to 2.36 mm) produced the best particle size of crushed seeds which give the maximum extraction percentage of oil (35.43%). For both whole and crushed seeds conditions, the percentage of oil extraction increased with the increase of applied pressure. at all levels of holding time. Meanwhile, the crushed seeds condition recorded higher extracted oil percentage in comparison with the whole seeds condition. The extraction efficiency also increased with . .Jncrease of applied pressure at all levels of holding times. However, the crushed seeds condition showed higher extraction efficiency in comparison with the whole seeds. The oil extraction efficiency ranged from 16.99 to 92.23 % for the whole seeds in comparison with 27.93 to 99.17 %for the crushed seeds. Also, it should be mentioned that, the crushing process increased the oil extraction efficiency by 6. 7 5 to 29.25 %.

Summary in Arabic.

1