Acid-based hydrolysis processes for ethanol from lignocellulosic materials: A review

By M. Taherzadeh, K. Karimi. BioResources, 2007

1,039 citations recorded by the source corpus.

Bioethanol is nowadays one of the main actors in the fuel market. It is currently produced from sugars and starchy materials, but lignocelluloses can be expected to be major feedstocks for ethanol production in the future. Two processes are being developed in parallel for conversion of lignocelluloses to ethanol, “acid-based” and “enzyme-based” processes. The current article is dedicated to review of progress in the “acid-based-hydrolysis” process. This process was used industrially in the 1940s, during wartime, but was not economically competitive afterward. However, intensive research and development on its technology during the last three decades, in addition to the expanding ethanol market, may revive the process in large scale once again. In this paper the ethanol market, the composition of lignocellulosic materials, concentrated- and dilute-acid pretreatment and hydrolysis, plug-flow, percolation, counter-current and shrinking-bed hydrolysis reactors, fermentation of hexoses and pentoses, effects of fermentation inhibitors, downstream processing, wastewater treatment, analytical methods used, and the current commercial status of the acid-based ethanol processes are reviewed.

Subfields: Biomedical Engineering, Molecular Biology

View Paper: https://www.semanticscholar.org/paper/e6cdeb9f93cb651bb3d77934120ffaf9347b7a99

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Citations in the corpus

Rhamnolipids as biosurfactants from renewable resources: Concepts for next-generation rhamnolipid production (2012, neutral): “[91] Taherzadeh MJ, Karimi K.”
Xylitol Biological Production: A Review of Recent Studies (2015, background): “Generally, highly concentrated acid hydrolysis is a nonselective process because of the presence of a high amount of acid, the energy consumption required for acid recovery, the longer reaction time, and the corrosive and hazardous nature of the process.(21) Dilute acid hydrolysis is the preferred m”
Wood based lignin reactions important to the biorefinery and pulp and paper industries. (2013, background): “It has been conjectured that the greater number of pores created by lignin removal allow cellulose and hemicellulose to be more accessible and thus more open to swelling and contact with enzymes (Taherzadeh and Karimi 2007), providing a favorable environment for hydrolysis.”
Progress in Physical and Chemical Pretreatment of Lignocellulosic Biomass (2013, background): “Different types of reactors are used for dilute acid treatments including batch, plug flow, percolation, countercurrent, and shrinking-bed reactors (Taherzadeh and Karimi 2007).”
Production of bioethanol from wheat straw: An overview on pretreatment, hydrolysis and fermentation. (2010, background): “Growing demand for human food, as it is for energy, and considering the priority for starving human society could make the first two groups of raw materials potentially less competitive and perhaps expensive feedstocks in the near future compared to lignocellulosic materials (Taherzadeh and Karimi, ”
A Review of Xylanase Production by the Fermentation of Xylan: Classification, Characterization and Applications (2013, background): “Despite the primarily first-generation production of ethanol, from sugar and starch, the second-generation production of ethanol has only begun to be tested in pilot plants [55].”