Conversion of biomass syngas to higher alcohols: from lab scale experiments to plant design
Koytsoumpa, E. I.
Panopoulos, K. D.
Liakakou, E. Th.
The catalytic conversion of synthesis gas originating from biomass produces ethanol, plus C3-C4 alcohols that could be used directly as fuels or as fuel additives for octane or cetane enhancement. The reaction has been studied over a wide range of catalytic materials, but has been limited up-to-date by low yields and poor catalyst selectivity. Of paramount importance for the efficient production of higher alcohols from biomass is the effective coupling of the biomass gasification and gas cleaning parts with the subsequent biosyngas synthesis to alcohols. The present paper presents first attempts for analytical process modeling of high pressure gasification and synthesis from biomass of diverse feedstock for synthesizing 2nd generation fuels and chemicals, such as higher alcohols, performed with ASPENplusTM software. In a first step of the work, a thermodynamic study was conducted with the objective to determine the thermodynamic limitations of the processes and to select the schemes / operating conditions that favor the formation of higher alcohols. The results showed that the hydrogenation of CO to higher alcohols is favoured by high pressures, low temperatures and low H2/CO ratio. The same trend was observed in CO hydrogenation over a synthesized K-promoted CuZnAl catalyst, at experiments performed on a high-pressure small scale bench test unit. At a second step, the process was simulated with the basis of the experimental results of the Cu45/Zn45/Al10-K0.5 catalyst at 300°C and 40bar. At these conditions, the material exhibits satisfactory selectivity and good once-through higher alcohols yield equal to 36 g C2+alcohols/kgcat/h. The analysis includes an investigation of gas cleaning pathways and their effect on total process efficiency. Moreover, the effect of methanol separation and recycling to the synthesis reactor on the higher alcohols yield was addressed.
Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης, Πολυτεχνική Σχολή, Τμήμα Χημικών Μηχανικών
info:doi/20th European Biomass Conference
,  p. 1705 - 1708
This record is part of 'IKEE', the Institutional Repository of Aristotle University of Thessaloniki's Library and Information Centre found at http://ikee.lib.auth.gr. Unless otherwise stated above, the record metadata were created by and belong to Aristotle University of Thessaloniki Library, Greece and are made available to the public under Creative Commons Attribution-ShareAlike 4.0 International license (http://creativecommons.org/licenses/by-sa/4.0).
Unless otherwise stated in the record, the content and copyright of files and fulltext documents belong to their respective authors. Out-of-copyright content that was digitized, converted, processed, modified, etc by AUTh Library, is made available to the public under Creative Commons Attribution-ShareAlike 4.0 International license (http://creativecommons.org/licenses/by-sa/4.0). You are kindly requested to make a reference to AUTh Library and the URL of the record containing the resource whenever you make use of this material.
*Institutions are responsible for keeping their URLs functional (digital file, item page in repository site)