Use of ordered packages with one or more accumulation points and one or more separation points

摘要

Usage of structured package involves providing structured package in a column in which extractive distillation-separation of substance from mixture comprising substance is carried out by adding selective solvent. The structured package has a backup layer(s) (1) and a separation layer(s) (2). At least one of backup layer has predetermined specific surface area according to flooding point of high value. At least one of separation layer has predetermined specific surface area according to flooding point of low value.