Title: Technology for extracting natural caffeine from tea
Application Number: 92109161 Application Date: 1992.08.06
Publication Number: 1067895 Publication Date: 1993.01.13
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: C07D473/12
Applicant(s) Name: Huakang Biochemistry Plant, Chongqing Address: 630039
Inventor(s) Name: Cheng Jinyao
Attorney & Agent: TIAN ZHENGWEI
Abstract:
     This process to extract natural coffeine from tea leaves includes steam-cooking tea leaves, filtering and centrifugal dewatering steps. It keys are as follows: further concentrating tea solution to 40-60%, addition of organic solvent in a ratio of 3:1-6:1 for extraction, stationarily putting extracted liquid in a low-temp. container for 30-60 minutes, distilling for both recovering organic solvent and discharging obtained coarse caffeine into a drum container, keeping temp. constant at a temp. less than or equal to 100 deg.C for 50-70 minutes, heating while crushing, removal of impurities, and sublimating in a sublimer.
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