Abstract:1/2。The combined dynamic countercurrent extraction equipment by microwave and ultrasonic-wave was investigated. The structural composition, working principle and technical characteristics of the equipment were introduced. The experiment of extracting more effective components of tea with the combination dynamic countercurrent extraction process by using microwave and ultrasonic-wave was tried with setting water as solvent and fresh tea leaves as raw materials. The rate of extracting effective composition in tea by using different extraction powers, extraction ratios of solid-liquid and extraction time were investigated. And the extraction process was optimized by L9 (34) orthogonal experimental design. The experimental results showed that the optimal extraction process parameters of the device were extraction time microwave 6 min + ultrasonic-wave 6min, solid-liquid ratio 1∶20, extraction power microwave 1.0kW + ultrasonic-wave 1.0kW. The extracting rate of tea polyphenol, amino acids and caffeine was higher than the normal extraction, and the extraction time, the extracting times and the extraction temperature were 1/5, 1/2 and 1/2 of the normal extraction, respectively.
