Green technology for caffeine synthesis
HU Xien(Institute of Nuclear Energy Technology, Tsinghua University, Beijing 100084, China)
This paper reviews the development of green technologies for the caffeine synthesis industry following the 3R (Reduce, Reuse, Recycle) rule. The by-product acetic acid from condensation can be recovered and recycled for production of chloroacetic acid and hydrochloric acid. A reciprocating plate extraction column is used to recover the caffeine not only to increase the yield but also to reduce the amount of the chloroform feed and the energy consumption. The highly toxic chloroform in the aqueous effluent can be recovered with an extraction-distillation process using sulfonated kerosene. A 2-ethylhexanol extraction process was developed to recover the theophylline in the aqueous effluent. The electrocatalysis hydrogenation of 1,3-dimethyl-4-amino-5-nitrouracil is a potential green technology for replacing the reductant, such as iron powder or hydrogen gas.
【CateGory Index】： TQ464