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溶剂萃取的两相有规律地反复多次混合澄清过程叫串级萃取。不同形式的串级工艺可以用下图表示。萃取器由n+m-1级构成,被分离物i 和j(多元组分亦可视为两元组分)全溶在有机相或水相S_(1F)或S_(2F)内,
Solvent extraction of the two phases regularly repeated multiple clarification process called cascade extraction. Different forms of cascade technology can be used as shown below. The extractor consists of n + m-1 stages and is completely dissolved in the organic or aqueous phase S_ (1F) or S_ (2F) by isolates i and j (the multicomponent can also be considered as a binary component)