| abstract |
Procedure for obtaining pure vitamin-E acetate or pure tocopherols from mixtures by rectification in a column with an exchange of matter, containing metal-packed gaskets with an ordered structure, at a head pressure from 0.2 to 2 mbar, in which a) the distribution of the liquid is carried out with distributors in the form of channels with a number equal to or greater than 500 drip points per m2, b) the channels of the distributor of liquids rotated with an angle of approximately 90 ° around the axis of the column with respect to the tissue layers of the packing elements, which are located directly below these distributors, c) being below the distributor of the liquids, 2 or several packing elements with a height of only 20 to 100 mm, whose layers of tissue are rotated with each other, respectively, 90 ° around the axis of the column, d) being conf The column is configured in detail so that, during rectification, virtually no heat exchange takes place through the wall of the column, e) the column is configured so that it can be operated practically under exclusion of air and f) pressure loss by separation stage it is reduced by a reduced adjustment of the liquid load in such a way that the temperatures, which are present in the tail, are reduced below the breakdown range of vitamin E acetate. |