Patent ID: 6111117
Filing Date: 2000-08-29
Classification: B01D,B01J,C07C,C07D,Y10S

Abstract:
A process for isolating pure substances from mixtures of high-boiling air- or temperature-sensitive substances or both which require a high separation efficiency, by rectification under medium vacuum in columns containing metal cloth packings with ordered structure, which comprises carrying out the rectification in a mass transfer column in whicha) the liquid distribution is undertaken with channel distributors with 500 or more drip points per m.sup.2,b) in which the channels of the liquid distributors are arranged at an angle of about 90.degree. to the cloth layers of the packing elements located immediately below these distributors,c) in which 2 or more packing elements which have a height of from 20 to 100 mm and whose cloth layers are in each case rotated by 90.degree. with respect to one another are located below the liquid distributors,d) the column is designed so that virtually no heat exchange through the column wall can take place during the rectification, ande) for air-sensitive substances, the column is designed so that it is possible to operate virtually with exclusion of air.