Process for extracting pure vitamin E-acetate or pure tocopheroles by rectification to remove lower and higher boiling contaminants

摘要

Process to rectify mixts. of high-boiling air and / or temp. sensitive substances requiring a high sepn. efficiency. Process is carried out in a fine vacuum (pref. 0.1-2 mbar) in columns contg. metal fabric packing of an ordered structure. The liq. distribution is carried out by channel distributors with at least 500 drainage points per square metre. The distributor channels are arranged at around 90 degrees to the fabric layers of the packing elements directly under these distributors. Two or more packing elements of height 20-100 mm are inserted below the distributor, whose fabric layers are turned at around 90 degrees to each other. The process is run in the complete absence of air and the rectification is operated strictly adiabatically. Also claimed are columns with output and enhancement sections contg. metal fabric packing for the above process.