针对传统工艺存在的收率低、有毒试剂用量大、污染严重等问题,研究了膜技术在猫豆左旋多巴提取中的应用,考察了各级膜工作过程及分离效果,探讨了膜技术工艺可行性.结果表明,猫豆提取液经过膜技术除杂、分离、浓缩三级膜过程,左旋多巴收率由传统工艺的50%提高至77.98%、纯度达到99.72%,超过国家药用要求,达到欧洲标准水平,且水回用率接近90%,整个工艺过程能耗低、污染少、不使用有毒试剂,实现了清洁生产目标.表明采用膜技术提取猫豆左旋多巴是切实可行的.%For traditional technology exists some problems such as low yield, using toxic agents and serious pollution, this paper mainly studied on the application of membrane technology to extract velvet bean L-dopa.The separation effects of various membrane processes were investigated to explore the feasibility of the membrane technology. The results showed that, treating the extract of velvet bean by three membrane processes of removing impurities, separation and concentration, the yield of L-dopa increased from 50％ of the traditional technology to 77.98％ and its purity reached 99.72％, which was over the national standard and was up to the European standard, furthurmore, the reused degree of water reached 90％. The whole process realized the cleaner production with low energy consumption, less pollution and didn＇t use toxic agents. So the membrane technology is feasible.
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