| 6554965 |
Rectification column for isolating pure substances from high boiling air-and/or temperature sensitive substances |
Horst Hartmann, Wolfram Burst, Harald Laas, Paul Grafen, Bernhard Bockstiegel +1 more |
2003-04-29 |
| 6184420 |
Preparation of unsaturated ketones |
Joaquim Henrique Teles, Norbert Rieber, Klaus Breuer, Dirk Demuth, Hartmut Hibst +2 more |
2001-02-06 |
| 6111117 |
Process for isolation of pure substances from mixtures of high-boiling air and/or temperature-sensitive substances which require a high separation efficiency by rectification under medium vacuum, and columns suitable for this process |
Horst Hartmann, Wolfram Burst, Harald Laas, Paul Grafen, Bernhard Bockstiegel +1 more |
2000-08-29 |
| 6005122 |
Preparation of .alpha.-tocopherol or .alpha.-tocopheryl acetate by reacting trimethylhydroquinone and phytol or isophytol, with recycling of the zinc halide condensation catalyst |
Kai-Uwe Baldenius, Bernhard Bockstiegel, Harald Laas, Bernhard Schulz, Peter D. Schmitt +1 more |
1999-12-21 |
| 5994589 |
Process for preparing 2,5,6-trimethyl-2-cyclohexen-1-one |
Detlef Ruff, Wolfram Burst, Manfred Stroezel |
1999-11-30 |
| 5950454 |
Cloth or cloth-like packing which is subject to low pressure losses and has an ordered structure for use in material-exchange columns and rectification method using such packing |
Wolfram Burst, Horst Hartmann, Harald Laas, Paul Grafen, Bernhard Bockstiegel +1 more |
1999-09-14 |
