Title:
Brønsted/Lewis-Acid Combinations for Hydrothermal Production of Levulinic Acid from Starch Residues
Author(s):
Köchermann, J., Klüpfel, C., Klemm, M.
Document(s):
Paper
Slide presentation
Abstract:
Levulinic acid (LA) is a versatile platform chemical that can be synthesized from hexoses, whereby fructose dehydration proceeds faster and more selectively than that of glucose. However, biogenic residues often contain cellulose or starch fragments that consist mainly of glucose. From the literature, it is well known reported that Lewis acids can catalyze the glucose isomerization to fructose. On the other hand, biomass hydrolysis, hexose dehydration to 5-hydroxymethylfurfural (HMF) and the rehydration of HMF to LA are Brønsted acid catalyzed. Therefore, this study will investigate the behavior of Brønsted/Lewis acid combinations for the hydrothermal synthesis of LA from wheat starch residues at moderate (160°C) and high (200°C) temperatures. As Brønsted acid catalysts sulfuric, phosphoric, and formic acid were used. In contrast to many previous studies and due the corrosion problematic, non-halogenated Lewis acids should be the subject of this investigation. Therefore, zirconium dioxide (ZrO2) and boric acid (H3BO3) were used as catalysts. As reference Lewis acid chromium(III) chloride (CrCl3) was used. Results show no catalytic activity for the used non-halogenated Lewis acids at each temperature. Reaction is mainly influenced by concentration of Brønsted acid and the respective acid anion. CrCl3 shows a good monocatalytic and negligible co-catalytic (H3PO4/CrCl3, 200°C) behavior.
Keywords:
biorefinery, catalytic conversion, biobased products, green chemistry, hydrothermal processes, wheat starch
Topic:
Biomass Technologies and Conversion to Intermediate Bioenergy Carriers and Products of the Bioeconomy
Subtopic:
Bio-based chemicals and materials
Event:
28th European Biomass Conference and Exhibition
Session:
3AO.9.4
Pages:
515 - 519
ISBN:
978-88-89407-20-2
Paper DOI:
10.5071/28thEUBCE2020-3AO.9.4
Price:
FREE
