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Xanthane production in the bubble column bioreactor; Xanthanproduktion im Blasensaeulen-Bioreaktor

Abstract

The industrial production of xanthane occurs in batch operation in stirred boiler reactors. The enrichment of the product in the culture medium causes an extreme increase of viscosity during strongly pseudoplastic flow behavior. Because of inhomogeneous distribution of the shear gradient in the stirred boiler, local deviations from the optimal fermentation conditions can occur (temperature, pH, oxygen supply); even stagnant regions may form at the walls. The suitability of tower reactors for xanthane production was investigated in the dissertation. The bubble column is by far superior to other reactor types (airlift, three-phase fluidized bed, stirred boiler, immersion-type beam reactor) with regard to good mixing of highly viscous culture broths of Xanthomonas campestris. The rise of the large bubbles which fill almost the entire column cross-section practically leads to intensive mixing. This not only makes the bubble column suitable for production but allow also the establishment of dependable fundamentals for model formation. (orig./EF). [Deutsch] Die industrielle Herstellung von Xanthan erfolgt satzweise in Ruehrkesselreaktoren. Die Anreicherung des Produkts im Kulturmedium bewirkt einen extremen Anstieg der Viskositaet bei einem stark pseudoplastischen Fliessverhalten. Wegen der inhomogenen Verteilung des Schergefaelles im Ruehrkessel koennen lokale Abweichungen von den optimalen Fermentationsbedingungen (Temperatur, pH-Wert, Sauerstoffversorgung) auftreten; schliesslich bilden  More>>
Authors:
Publication Date:
May 14, 1992
Product Type:
Thesis/Dissertation
Report Number:
ETDE-mf-93744511
Reference Number:
SCA: 090900; PA: DE-92:016254; SN: 93000905983
Resource Relation:
Other Information: TH: Diss. (Dr.-Ing.); PBD: 14 May 1992
Subject:
09 BIOMASS FUELS; XANTHUM GUM; PRODUCTION; BIOREACTORS; COMPARATIVE EVALUATIONS; VISCOSITY; HYDRODYNAMICS; MICROORGANISMS; CULTURE MEDIA; 090900; PROCESSING
OSTI ID:
10106631
Research Organizations:
Technische Univ. Braunschweig (Germany). Fakultaet fuer Maschinenbau und Elektrotechnik
Country of Origin:
Germany
Language:
German
Other Identifying Numbers:
Other: ON: DE93744511; TRN: DE9216254
Availability:
OSTI; NTIS (US Sales Only)
Submitting Site:
DE
Size:
140 p.
Announcement Date:
Jun 30, 2005

Citation Formats

Suh, II-Soon. Xanthane production in the bubble column bioreactor; Xanthanproduktion im Blasensaeulen-Bioreaktor. Germany: N. p., 1992. Web.
Suh, II-Soon. Xanthane production in the bubble column bioreactor; Xanthanproduktion im Blasensaeulen-Bioreaktor. Germany.
Suh, II-Soon. 1992. "Xanthane production in the bubble column bioreactor; Xanthanproduktion im Blasensaeulen-Bioreaktor." Germany.
@misc{etde_10106631,
title = {Xanthane production in the bubble column bioreactor; Xanthanproduktion im Blasensaeulen-Bioreaktor}
author = {Suh, II-Soon}
abstractNote = {The industrial production of xanthane occurs in batch operation in stirred boiler reactors. The enrichment of the product in the culture medium causes an extreme increase of viscosity during strongly pseudoplastic flow behavior. Because of inhomogeneous distribution of the shear gradient in the stirred boiler, local deviations from the optimal fermentation conditions can occur (temperature, pH, oxygen supply); even stagnant regions may form at the walls. The suitability of tower reactors for xanthane production was investigated in the dissertation. The bubble column is by far superior to other reactor types (airlift, three-phase fluidized bed, stirred boiler, immersion-type beam reactor) with regard to good mixing of highly viscous culture broths of Xanthomonas campestris. The rise of the large bubbles which fill almost the entire column cross-section practically leads to intensive mixing. This not only makes the bubble column suitable for production but allow also the establishment of dependable fundamentals for model formation. (orig./EF). [Deutsch] Die industrielle Herstellung von Xanthan erfolgt satzweise in Ruehrkesselreaktoren. Die Anreicherung des Produkts im Kulturmedium bewirkt einen extremen Anstieg der Viskositaet bei einem stark pseudoplastischen Fliessverhalten. Wegen der inhomogenen Verteilung des Schergefaelles im Ruehrkessel koennen lokale Abweichungen von den optimalen Fermentationsbedingungen (Temperatur, pH-Wert, Sauerstoffversorgung) auftreten; schliesslich bilden sich an den Waenden sogar stagnante Zonen aus. In dieser Arbeit sollte die Eignung von Turmreaktoren zur Xanthanproduktion untersucht werden. Die Blasensaeule erwies sich gegenueber anderen Reaktortypen (Airlift, Dreiphasenfliessbett, Ruehrkessel, Tauchstrahlreaktor) hinsichtlich der guten Vermischung hochviskoser Kulturbruehen von Xanthomonas campestris als deutlich ueberlegen. Der Aufstieg der Grossblasen, die praktisch den gesamten Saeulenquerschnitt erfassen, fuehrt zu einer intensiven Durchmischung. Dies macht die Blasensaeule nicht nur zur Produktion geeignet, sondern erlaubt auch die Besorgung verlaesslicher Grundlagen fuer die Modellbildung. (orig./EF).}
place = {Germany}
year = {1992}
month = {May}
}