Experiment on Decaffeination from Green Tea Using Supercritical CO_2

：Experiment on extraction of caffeine from green tea with supercritical CO2 was carried out. The influences of moisture content of green tea and operating pressure, operating temperature, extracting time on decaffeination rate of green tea were studied. The results showed that much of caffeine in green tea could be removed using supercritical CO2 and better moisture content of green tea for extraction is 40%. On the basis of this condition, decaffeination rate was increased with extracting pressure and temperature and time.