Basf Aktiengesellschaft

Basf Magnetics Gmbh

Emtec Magnetics Gmbh

Karl-Heinz Sartor

Norbert Muller

Jochen Eicher

Gerd Kaibel

Manfred Stroezel

Oskar Stephan

Thomas Wunsch

Carsten Oost

Gerald Meyer

Peter Thoma

Klaus Borho

Karl K Mayer

Wolfgang Mach

Peter Trübenbach

Wolf D Stege

Karl-Heinz Hennicke

Zafirios Grammatis

Axel-Rudiger Schulze

Jürgen Heners

Ewald Vollmerhaus

A process is proposed for the separation of Ccuts by distillation into a low-boiler (A), a medium-boiler (B) and a high-boiler fraction (C) in one or more dividing-wall columns (TK), in which a dividing wall (T) is arranged in the longitudinal direction of the column with formation of an upper, common column region (), a lower, common column region (), a feed part () with rectifying section () and stripping section (), and a withdrawal part () with rectifying section () and stripping section (), with feed of the Ccut (A, B, C) into the central region of the feed part (), discharge of the high-boiler fraction (C) from the bottom of the column, discharge of the low-boiler fraction (A) via the top of the column, and discharge of the medium-boiler fraction (B) from the central region of the withdrawal part (), wherein the dividing ratio of the liquid reflux at the upper end of the dividing wall (T) is set in such a way that the proportion of high-boiling key components in the liquid reflux over the stripping section () of the withdrawal part at the upper end of the dividing wall (T) is from 10 to 80%, preferably from 30 to 50%, of the limit value allowed in the medium-boiler fraction (B), and wherein the heating power in the evaporator at the bottom of the dividing-wall column (TK) is set in such a way that the concentration of the low-boiling key components in the liquid at the lower end of the dividing wall (T) is from 10 to 80%, preferably from 30 to 50%, of the limit value allowed in the medium-boiler fraction (B).

[object Object]

Recovery of raw materials from magnetic recording media

Thermoplastic moulding materials based on polyethylene terephthalate for

A continuous closed-system process for the environmentally friendly drying and purification of benzanthrone which comprises the steps of charging a benzanthrone-containing paste of pumpable consistency onto a melt held in a stirred kettle, dewatering and melting the paste by means of steam, condensing the water vapor emerging from the stirred kettle, flaking the melt from the stirred kettle by means of a rotating drum, and packaging the flaked solids.

Drying and purification of benzanthrone

Growing community of inventors

Neuried, Germany

Karl-Heinz Sartor