Ethanol production in an immobilized‐cell reactor

Abstract

SummaryBiomass can be converted to sugars by hydrolysis with enzymes or mineral acids. These sugars can be converted into a number of chemical intermediates in biological reactors. Biological reactions are generally slow and selection of the most efficient reactor is important in these applications. Immobilized-cell reactors allow high cell densities and high throughput by attaching the microorganisms to a fixed support. This paper examines the rate of production of ethanol from glucose by Saccharomyces cerevisiae in a packed column. These rates are compared with those for the same reaction in a stirred reactor.

Comparison of suspended and immobilized yeast metabolism using 31P nuclear magnetic resonance spectroscopy

“…pH units (on average) is observed between the steady-state intracellular pl!I (assuming a similar error in pH determination from pi" chemical shift in both cases). This difference is consistent with and may explain higher specific glucose uptake rates and ethanol productivities found for immobilized cells compared to suspended yeast (Doran and Bailey, 1986;Chotani and Constantinides, 1984;Sitton and Gaddy, 1980). Measurements conducted in conjunction with these experiments show the same trends.…”

Production of ethanol by adsorbed yeast cells

“…Sltton and Gaddy (1980) entrapped yeast cells In qelatln-qlutaraldehyde and used a column reactor for the contlnuous productlon of ethanol. Ghose and BandyoDadhyay (1980) reported the successful attachment of yeast cells on some unsDeclfled support materlal (Carriers A, B).…”

Performance evaluation for Bioethanol production in three reactors: Batch, packed bed and Fluidized bed bio-reactors

“…The maximum Ethanol concentration will be achieved in packed bed reactor than other two reactors and can be seen in figures 3-5. (Sitton and Gaddy (1980)). Conversions in fluidized bed reactors were better than batch reactor (Gilson and Thomas (1995) (Najafpour, et al (2004)).…”