Black nightshade oil Extraction Using Supercritical Fluid Carbon Dioxide

Black nightshade is a weed plant that grows abundantly in most parts of Iran. In this study، central composite response surface method to investigate the effect of temperature 35-55 °C and pressures 170-350 bar during the dynamic time of 120 min، the particle size of 150 microns and flow rate of 3 liters per minute on the efficiency of oil extracted from the fruits of black nightshade and optimizing operation of the extraction process using supercritical carbon dioxide was used. Extraction with an organic solvent hexane was chosen as a comparison. Based on the results، operating parameters including both pressure and temperature and their quadratic effects as well as the interaction between two parameter significant effect on the rate of extraction of oil