| 7713387 |
Method for separating trioxane from a trioxane/formaldehyde/water mixture by means of pressure change rectification |
Markus Siegert, Neven Lang, Achim Stammer, Thorsten Friese, Hans Hasse |
2010-05-11 |
| 7544832 |
Reaction column in a special combination with a natural circulation evaporator |
Jan Bredehoft, Hans-Jurgen Pallasch, Ludwig E. Heck |
2009-06-09 |
| 7431804 |
Method for carrying out the distillation or reactive distillation of a mixture containing at least one toxic constituent |
Gerd Kaibel, Achim Stammer, Carsten Oost, Martin Sohn, Manfred Stroezel +1 more |
2008-10-07 |
| 7381851 |
Method for producing formaldehyde |
Gerhard Olbert, Thorsten Johann, Markus Weber, Neven Lang, Martin Fiene +1 more |
2008-06-03 |
| 7342139 |
Method for producing highly concentrated formaldehyde solution |
Bernd Rumpf, Ortmund Lang, Neven Lang |
2008-03-11 |
| 7230130 |
Process for preparing methylenedianiline and methylenebis (phenylisocyanate) |
Jan Jacobs, Wilfried Seyfert, Hans Volkmar Schwarz, Olaf Schweers, Volker Scharr +1 more |
2007-06-12 |
| 7193115 |
Highly concentrated formaldehyde solution, production and reaction thereof |
Martin Sohn, Hans Hasse, Klemens Schilling |
2007-03-20 |
| 7105078 |
Method for producing an aqueous hydroxylamine solution devoid of salt |
Karl-Heinz Wostbrock, Markus Weber, Steffen Kerth |
2006-09-12 |
| 7029557 |
Method for producing an aqueous hydroxylamine solution devoid of salt |
Karl-Heinz Wostbrock, Joachim Thiel, Heinz Krüger, Markus Weber, Bernd Gerber +3 more |
2006-04-18 |
| 6962682 |
Fixed-bed process for producing chlorine by catalytic gas-phase oxidation of hydrogen chloride |
Christian Walsdorff, Martin Fiene, Christoph Adami, Klaus Harth |
2005-11-08 |
| 6942762 |
Method for the production of a salt-free aqueous hydroxylamine solution |
Karl-Heinz Wostbrock, Joachim Thiel, Heinz Krüger, Markus Weber, Bernd Gerber +3 more |
2005-09-13 |
| 6916953 |
Integrated process for preparing isocyanates |
Christian Walsdorff, Martin Fiene, Klaus Harth, Jan Jacobs, Filip Deberdt |
2005-07-12 |
| 6831192 |
Process for preparing methylenedianiline and methylenebis(phenyl isocyanate) |
Jan Jacobs, Wilfried Seyfert, Hans Volkmar Schwarz, Olaf Schweers, Volker Scharr +1 more |
2004-12-14 |
| 6758990 |
Stabilizing agent for hydroxylamine solutions |
Markus Weber, Hans-Josef Sterzel, Otto Watzenberger |
2004-07-06 |
| 6673960 |
Work-up of distillation residues from the synthesis of toluene diisocyanate |
Hans Volkmar Schwarz, Markus Maurer, Michael Sander, Rene Leuthold, Burghard Hantel +2 more |
2004-01-06 |
| 6610888 |
Reaction of a solution comprising a mixture |
Stephan Scholl, Hans Hasse |
2003-08-26 |
| 6576788 |
METHOD FOR PRODUCING MIXTURES CONSISTING OF DIPHENYLMETHANE DIISOCYANATES AND POLYPHENYLENE-POLYMETHYLENE-POLYISOCYANATES CONTAINING A REDUCED AMOUNT OF CHLORINATED SECONDARY PRODUCTS AND WITH A REDUCED IODINE COLOR INDEX |
Ulrich Penzel, Volker Scharr, Dieter Starosta, Hilmar Boesel, Joachim Pfeffinger +8 more |
2003-06-10 |
| 6433219 |
Method for the production of methylenedi(phenylamine and methylenedi(phenyl isocyanate) |
Jan Jacobs, Wilfried Seyfert, Hans Volkmar Schwarz, Olaf Schweers, Volker Scharr +1 more |
2002-08-13 |
| 6350911 |
Method for producing amines |
Michael Sander, Ulrich Penzel, Hans Volkmar Schwarz, Dieter Stützer, Jörn Müller +5 more |
2002-02-26 |
| 6299734 |
Preparation of an aqueous solution of free hydroxylamine |
Otto Watzenberger, Peter Mauer, Heiner Schelling, Hans-Michael Schneider |
2001-10-09 |
| 6153799 |
Method for producing highly pure aqueous hydroxylamine solutions |
Otto Watzenberger, Heiner Schelling, Peter Pfab |
2000-11-28 |
