For the purpose of optimizing the counter current extraction process some new equations have been derived for calculating the optimized extraction factors to search the minmum total volume of mixer settler extractor or scrubbing section at the same production capacity and product quality. 以分馏萃取分离相同数量相同质量产品,萃取段、洗涤段所用萃取槽总体积最小为优化目标,推导出了优化萃取比新方程。