Oil Extraction Essay

920 Words2 Pages

There are three major methods in extraction of edible oil from plants and fruits. The first major method is by solvent extraction with organic solvent. This method is mostly suitable for plants with low fat content. Since every species of plant consists of different composition, hence the modification of this method is needed based on different plants. Firstly, the traditional and conventional solvent extraction has been widely and commonly used for many plants. However, some studies show this method does not obtain highest productivity in extraction. The procedures for this method are firstly prepared a round bottom flask outfitted with a water condenser on plate heater with magnetic base. The mixture with the ratio of 3:1 solvent to feedstock is brought to desired extraction temperature, and then it is placed into the round bottom flask. The round bottom flask is then placed into preheated oil bath. After the required duration of time, oil from the mixture was extracted by centrifugation. Oil extraction yield was expressed as percentage of total oil in sample divided by total oil in feed (Terigar et al., 2011). The value of total oil is then obtained from Sohxlet extraction method. Sohxlet solvent extraction method has also been used widely for determination oil contain in product. Specific weight of sample was placed in a cellulose thimble. The thimble is then fitted into a distillation flask. The solvent used in this method are hexane or ethanol. The volume of solvent used is highly depending on the sample used in the beginning of the experiment. This extraction undergoes in Sohxlet device for about 10 hours. After the extraction, solvent was expelled in a rotary- evaporator and the extract was dried under nitrogen steam (Teri...

... middle of paper ...

...ust be maximized to gain high yield. Carbon dioxide is liquefied and pumped into the vessel. The CO2 is compressed to the desired working pressure by using a syringe pump. Then, it is heated to supercritical conditions using a double pipe heat exchanger and reboiler. The temperature is thermostatically maintained and the back-pressure regulator was manually adjusted to remain constant extraction pressure. Extraction is then driven into a separator by decrease in pressure. It is manipulated by second regulator. After the supercritical carbon dioxide extraction, the extracted oil is collected for purification. De-ionized water is mixed with the extraction oil. The mixture is then placed is water bath for 30 minutes with ultrasonic vibration and degumming. Lastly, the upper liquid is collected and centrifuge at specific rpm (Ixtaina et al., 2010; Cheng et al., 2012).

More about Oil Extraction Essay

Open Document