[Study on recovery of ethyl acetate after extracting tripterygium wifordii extractum with ethyl acetate].

OBJECTIVE: To increase the recovery rate of ethyl acetate after extracting tripterygium wifordii extractum and to decrease product cost. METHOD: After extracting tripterygium wifordii extractum with ethyl acetate, 3 times saturated salt water was added in it so as to recovery ethyl acetate distilled under normal atmospheric pressure. Ethyl acetate containing salt water was purified through Na2SO4 column. RESULT: Ethyl acetate purified could be used repeatedly and the recovery rate was up to 85%. CONCLUSION: This method is completely adapted for mass production.