Basf Aktiengesellschaft

Wulf Kaiser

Kai-Uwe Baldenius

Harald Laas

Bernhard Bockstiegel

Wolfram Burst

Horst Hartmann

Paul Grafen

Joaquim Henrique Teles

Hartmut Hibst

Norbert Rieber

Manfred Stroezel

Dirk Demuth

Bernhard Schulz

Klaus Breuer

Heinz Etzrodt

Detlef Ruff

Helmut Glietenberg

Peter Schmitt

Stefan Kaeshammer

A reflection column which contains liquid distributors having at least 500 drip points/m , which are arranged at an angle of about 90&deg; C. to cloth layers of packing elements located immediately therebelow; and a combination of insulation and protective heating. The column is advantageously used for the rectification of mixtures of high-boiling air- or temperature-sensitive substances requiring effective separation efficiency.

Rectification column for isolating pure substances from high boiling air-and/or temperature sensitive substances

Unsaturated ketones of the formulae Ia and Ib

Preparation of unsaturated ketones

Process for isolation of pure substances from mixtures of high-boiling

A process for preparing .alpha.-tocopherol or .alpha.-tocopheryl acetate by reacting 2,3,5-trimethylhydroquinone with isophytol or phytol in the presence of a zinc halide condensation catalyst and a proton donor in a solvent with or without subsequent esterification with acetic anhydride, which comprises

Preparation of .alpha.-tocopherol or .alpha.-tocopheryl acetate by

A process for preparing 2,5,6-trimethyl-2-cyclohexen-1-one by reacting diethyl ketone with crotonaldehyde or a compound which is converted under the chosen reaction conditions into crotonaldehyde, in the presence of basic agents at elevated temperature, which comprises

Process for preparing 2,5,6-trimethyl-2-cyclohexen-1-one

Cloth or cloth-like packing which is subject to low pressure losses and

Growing community of inventors

Bad Durkheim, Germany

Wulf Kaiser