Zobrazeno 1 - 10
of 145
pro vyhledávání: '"Ulfert Onken"'
Publikováno v:
Journal of Chemical Technology & Biotechnology. 50:1-11
For gluconic acid fermentation with Aspergillus niger oxygen-enriched air was used to increase dissolved oxygen concentration during the production phase from c. 30% to 100% saturation related to air at 1 bar. At the highest dissolved oxygen concentr
Autor:
Manfred Baerns, Arno Behr, Axel Brehm, Jürgen Gmehling, Kai-Olaf Hinrichsen, Hanns Hofmann, Ulfert Onken, Regina Palkovits, Albert Renken
Das grundlegende Lehrbuch der Technischen Chemie mit hohem Praxisbezug jetzt in der zweiten Auflage:?? beschreibt didaktisch äußerst gelungen die Bereiche – chemische Reaktionstechnik, Grundoperationen, Verfahrensentwicklung sowie chemische Proze
Autor:
Ulfert Onken
Publikováno v:
Chemical Engineering & Technology. 20:71-75
Chemical engineering is taught at German universities in three different types of curricula: chemical engineering proper, process engineering (Verfahrenstechnik), and industrial chemistry (Technische Chemie). Independent departments resp. faculties o
Publikováno v:
Chemie Ingenieur Technik. 67:892-895
Publikováno v:
Journal of Fermentation and Bioengineering. 79:594-600
Microbial production of metabolites is often limited by product inhibition, decomposition or bio-degadation during the process of fermentation. If the product can be removed from the broth, e.g. by liquid/liquid extraction, these losses can be reduce
Publikováno v:
Journal of Applied Electrochemistry. 24:666-669
An electrodiffusional three-segment probe was developed with which local axial and radial liquid velocities can be determined. Application of this probe in gas-liquid flow yields information on local gas hold-up. In coalescing media the commonly used
Publikováno v:
Experiments in Fluids. 16:368-374
The influence of eddy shedding on the instantaneous readings of a three-segment cylindrical electrodiffusion velocity probe was investigated in an immersed jet with a very low turbulence intensity, σ = 1.2%. The velocity fluctuations measured by the
Publikováno v:
Enzyme and Microbial Technology. 14:1001-1006
The influence of dilution rate and dissolved oxygen concentration on continuous production of 2,5-diketogluconic acid (2,5-DKGA) by Gluconobacter oxydans subsp. melanogenum is described. Under suitable dissolved oxygen conditions, the glucose oxidati
Autor:
Ulfert Onken, Michael Immich
Publikováno v:
Chemical Engineering Science. 47:3379-3386
For design and operation of bubble columns and airlift reactors with suspended solid particles it is necessary to know the minimum gas velocity for maintaining the state of complete solid suspension. To predict this critical gas velocity information
Publikováno v:
Biotechnology and Bioengineering. 39:442-446
A new system for the perfusion culture of animal cells in suspension is described. It consists of an airlift loop reactor and a settling tank for cell retention. Insufficient nutrient and oxygen supply of the cells in the settling tank was prevented