Year: 2023
Type: book-chapter
Abstract: Resumo-Fermentation is the main step in bioethanol production.The major fermentation problems are the yeast inhibition when high ethanol concentrations are reached, and the high amounts of water added to the process.One way to overcome these problems is to couple fermentation to a continuous process removal, or known as in situ removal techniques.Such techniques allow the use of high sugar concentrations in the broth, keeping ethanol concentration in acceptable ranges to microorganism metabolism.Gas stripping in situ removal presents itself as a simple technique that requires no membrane or expensive chemicals and easy to integrate with fermentation process.In this work, the simulation of a gas stripping fermentation process was carried out using ASPEN PLUS® V.7.3, in order to evaluate the ethanol separation process behavior related to different fermentation temperatures.Initially a case study was performed, where a concentrate sugar stream at 30% wt was fed to a reactor operating at a temperature of 34°C with 7 L/min of CO2 gas flow rate.In this simulation, 67 % of ethanol was stripped which allowed ethanol concentration to be kept below threshold of toxicity.The results shown that high ethanol recoveries were reached as high as the temperature employed.Nonetheless, the temperature range studied was limited by the S. cerevisiae yeast behavior, so, in practice, only narrow temperature ranges could be applied for gas stripping fermentation process.
DOI: 10.37423/230107139
Language: Portuguese
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2177887491