Gas holdup in a reciprocating plate bioreactor: non-newtonian liquid phase

The gas holdup was studied in non-newtonian liquids in a gas-liquid and gas-liquid-solid reciprocating plate bioreactor. Aqueous solutions of carboxy methyl cellulose (CMC; Lucel, Lucane, Yugoslavia) of different degrees of polymerization (PP 200 and PP 1000) and concentration (0.5 and 1%), polyprop...

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Bibliographic Details
Published in:Hemijska industrija 2002, Vol.56 (5), p.198-203
Main Authors: Naseva, O.S. (Tehnoloski fakultet, Leskovac (Yugoslavia)), Stamenkovic, I.S, Bankovic-Ilic, I.B, Lazic, M.L, Veljkovic, V.B, Skala, D.U
Format: Article
Language:eng ; srp
Subjects:
BIOREACTEUR
BIOREACTORS
BIORREACTORES
Carboxymethyl cellulose
Coalescing
Concentration (composition)
Degree of polymerization
Flow velocity
Gas flow
gas holdup
gas-liquid reactors
gas-liquid-solid reactors
Gas-liquid-solid systems
GASES
GAZ
Liquid-solid systems
Newtonian liquids
Non Newtonian liquids
Polymerization
Polypropylene
reciprocating plate bioreactor
reciprocating plate column
Reciprocation
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Summary:The gas holdup was studied in non-newtonian liquids in a gas-liquid and gas-liquid-solid reciprocating plate bioreactor. Aqueous solutions of carboxy methyl cellulose (CMC; Lucel, Lucane, Yugoslavia) of different degrees of polymerization (PP 200 and PP 1000) and concentration (0.5 and 1%), polypropylene spheres (diameter 8.3 mm; fraction of spheres: 3.8 and 6.6% by volume) and air were used as the liquid, solid and gas phase. The gas holdup was found to be dependent on the vibration rate, the superficial gas velocity, volume fraction of solid particles and rheological properties of the liquid phase. Both in the gas-liquid and gas-liquid-solid systems studied, the gas holdup increased with increasing vibration rate and gas flow rate. The gas holdup was higher in three-phase systems than in two-phase ones under other operating conditions being the same. Generally, the gas holdup increased with increasing the volume fraction of solid particles, due to the dispersion action of the solid particles, and decreased with increasing non-newtonian behaviour (decreasing flow index), i.e. with increasing degree of polymerization and solution concentration of CMC applied, as a result of gas bubble coalescence.
ISSN:0367-598X
2217-7426
DOI:10.2298/HEMIND0205198N