| 5073622 |
Process for the preparation of novolak resins with low metal ion content |
Walter Niederstaetter, Horst-Dieter Thamm |
1991-12-17 |
| 5068358 |
Process for extracting N-methyl-2-pyrrolidone |
Georg-Emerich Miess, Karl-Heinz Schwarz, Heribert Tetzlaff |
1991-11-26 |
| 4986974 |
Process for the separation of halogenated hydrocarbons from hydrochloric acid |
Wilhelm Lendle, Wolfgang Scheibitz, Heribert Tetzlaff |
1991-01-22 |
| 4864065 |
Process for removing halogenated hydroxyaromatics from aqueous solutions |
Siegbert Rittner, Heinz Reiss, Reinhard Zunder |
1989-09-05 |
| 4814518 |
Process for extracting nitrohydroxyaromatics from aqueous solutions |
Helmut Gossel, Herbert Kuckertz, Siegbert Rittner, Josef Rosenfelder |
1989-03-21 |
| 4720577 |
Process for the extraction of carboxylic acids from dilute aqueous solutions |
Walter Steppich, Dieter Freudenberger, Knut Riedel |
1988-01-19 |
| 4626605 |
Process for extracting phenols from aqueous solutions |
Manfred Mayer, Karl-Erich Ott |
1986-12-02 |
| 4373073 |
Process for the preparation of glycidyl ethers of monohydric or polyhydric phenols, the glycidyl ethers and use thereof |
Hans-Joachim Kiessling, Wilhelm Becker, Kurt Hermann |
1983-02-08 |
| 4196180 |
Purification of phosphoric acid by means of organic solvents |
Klaus-Peter Ehlers, Wolfgang Scheibitz |
1980-04-01 |
