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Pietzonka
Ines Pietzonka, Regensburg DE
| Patent application number | Description | Published |
|---|---|---|
| 20080224156 | Luminescent Diode Provided with a Reflection- Reducing Layer Sequence - A luminescence diode ( | 09-18-2008 |
Torsten Pietzonka, Regensburg DE
| Patent application number | Description | Published |
|---|---|---|
| 20100220396 | Optical Device, Method of Producing the Device and Optoelectronic Component Comprising the Device - An optical device having a specific form is provided that includes a resin molding compound having an adhesion-reducing, chemically modified surface layer. | 09-02-2010 |
Warner Pietzonka, Therwil CH
| Patent application number | Description | Published |
|---|---|---|
| 20110036702 | PROCESS FOR THE RECTIFICATION OF MIXTURES OF HIGH-BOILING AIR- AND/OR TEMPERATURE-SENSITIVE USEFUL PRODUCTS - According to the invention, a process for the rectification of mixtures of high-boiling air- and/or temperature-sensitive substances which require a high separation efficiency is proposed, in particular a process for the working-up of a VE- or VEA-containing product stream. The process is characterized in particular in that, in a first purification stage, low-boiling products and unspecified isomers of the useful product are separated from the product stream virtually without loss of useful product and that, in a second purification stage, the useful product is removed in a stream having a purity of >97% by weight and a further stream having a purity of >92% by weight. A preferred embodiment of the process serves for working up VEA, in which the loss of useful product in the first purification stage is less than 5%, based on that amount of VEA in the feed which is added to the purification stage per unit time. Furthermore, the first purification stage may comprise a rectification column ( | 02-17-2011 |
Werner Pietzonka, Therwil CH
| Patent application number | Description | Published |
|---|---|---|
| 20090287002 | Process for the working-up of a vitamin E- and vitamin E-acetate- containing mixture or products stream - The invention relates to a process for the working-up of a vitamin E (VE)- and/or vitamin E acetate (VEA)-containing product stream, which is substantially characterized by purification of a vitamin E-containing product stream, acetylation of at least a part of the purified vitamin E and purification of at least a part of the acetylated vitamin E, the purification of vitamin E and vitamin E acetate preferably being effected by distillation, for example rectification. A preferred process according to the invention is characterized in that a vitamin E-containing product stream is fed to a first rectification column ( | 11-19-2009 |