Analysis of gas stripping during ethanol fermentation-II. A combined product-substrate inhibition case
Journal
Chemical Engineering Science
Journal Volume
46
Journal Issue
10
Pages
2551-2565
Date Issued
1991
Author(s)
Abstract
Gas stripping during ethanol fermentation (GSEF) in a CSTR for a combined product-substrate inhibition case has been analyzed using a modification of the Ghose-Tyagi specific growth rate model and the Luedeking-Piret production model to simulate the GSEF system. The system exhibits three multiple steady states which are associated with a hysteresis effect and stability problems. The advantages of using gas stripping are shown by simulation of profiles of cell concentration, substrate concentration, ethanol concentration remaining in the broth, and productivity as a function of dilution rate and stripping factor. The results are the same only for the case of product inhibition presented previously. For the hysteresis effect, the gas stripping provides an additional advantage of extending the range of operational variables to subdue the noise problem. The local stability criteria and the attraction region of initial concentration on global stability are also presented. © 1991.
Type
journal article