Extraction of Grape Seed Oil from Grape Seed with Supercritical CO_2

Grape seed oil contains quantitative linoleic acid and other unsaturated fatty acids which can be used as food and also have high officinal value. The traditional methods of extracting grape seed oil have some defects such as the low yield and the solvent residue. In order to make full use of the abandoned grape seeds in vintage process and to avoid the mentioned defects, the feasibility of extraction of oil from the grape seeds with supercritical fluid CO2 was studied. The influences of extraction temperature, extraction pressure,the amounts of CO2 used and the different grape seeds on the extraction yield of grape seed oil were investigated. The results show that the extraction pressure has more remarkable effect on the yield than the temperature, the extraction yield of oil is up to 9.71% when using the seeds offered by Changyu Pioneer Wine Co. Ltd. and the suitable extraction temperature is 55C and the extraction pressure is 30MPa. GC analysis of the oil product shows that the product contains 72.05% linoleic acid. The experiments were done respectively using the materials from three different sources, and the corresponding yields of grape seed oil have some differences among the three materials and the highest yield is up to 13.51%.