Oil Extraction Techniques Research Articles

Supercritical carbon dioxide extraction of cottonseed oil

Supercritical fluid extraction (SFE) using carbon dioxide is a popular technique for oil extraction due to its high extraction efficiency, short extracting time, lower refining requirement and absence of chemical residues or contamination in the extracted oils. In this work, an attempt has been made to extract oil from a local variety of cottonseed using this technique. The effects of the extraction parameters of pressure, temperature and time of extraction of oil were optimized by using statistical techniques such as central composite rotate design (CCRD) and response surface methodology (RSM), with a view to maximize the oil yield with minimum gossypol extraction. From this study, it could be concluded that the yield of cottonseed oil can be improved at pressure higher than 550 bar, in the temperature zone of 70–80 °C and extracting time of 2–3 h.

An improvement in oil and grease extraction techniques

An improvement in oil and grease extraction techniques

Analysis of the oil extraction process in soybeans: A new continuous procedure

AbstractSoybean oil extraction techniques were studied in which solvent was recirculated or pumped once through a suspension of soybean tissue. Both refractive index and ultraviolet absorbance were used to monitor the extraction continuously. Slices of soybean tissue showed rapid extraction from damaged tissue, followed by slow extraction from intact tissue. When soybean flakes were extracted, a continuously decreasing rate was noted. When solvent was forced through flakes, extraction was more rapid than when solvent was allowed to diffuse in and out of flakes. Reextraction of partially defatted flakes showed that the last soybean oil to be extracted was not inherently resistant to extraction. The adsorption of soybean oil to defatted flakes may account for slow removal of small quantities of oil at the end of the extraction.

STUDIES ON THE UTILIZATION OF COCONUT MEAL A New Enzymic‐Chemical Method for Fiber Free Protein Extraction of Defatted Coconut Flour

A simple enzymic‐chemical protein extraction process was developed. Proteases rather than carbohydrases were more efficient for the enzymatic treatment. Dilute NaOH was more effective than dilute HCl for the complementary chemical treatment. The combined treatments were more efficient than each of the two separately. The method devised was equally effective when applied to live coconut meals obtained through different oil extraction techniques. The partial hydrolysis of the protein during the proteolytic enzyme treatment appears to enhance the protein extractability by the complementary chemical treatment. Further, the resultant product is free of fiber

Production of Rapeseed Flour for Human Consumption

An aqueous extraction procedure for the removal of thioglucosides from crushed rapeseed is described. The batch procedure consists of two 30-minute extractions at ambient temperature, each followed by a filter wash on a vibratory screen. Solids losses are considered excessive, although they have been reduced to 17 per cent. The defatted rapeseed flour and meal produced by standard oil extraction and air classification techniques contain over 50% and 30% protein respectively. Thioglucoside content of each product is almost nil. The PER value of the hull-free rapeseed flour is of the same magnitude as casein, whereas hull-rich rapeseed meal is below casein. The PER value of rapeseed is increased significantly by inactivation of myrosinase and removal of thioglucosides.