LİGNOSELÜLOZİK BİYOKÜTLELERDEN LEVULİNİK ASİT ÜRETİMİNİN İNCELENMESİ
Project no. 20183 · Status: Kapanmış (Yayın bekleniyor) · 2019
Summary
Biomass-based production of levulinic acid (LA) is being investigated with increasing interest. The main reason of this interest for this is that LA is one of the 12 most valuable platform chemicals and there are many end products that can be produced from LA [1]. The production of platform chemicals from fossil sources and traditional methods has led to the search for alternative sources and methods due to their disadvantages such as limited reserves, increased costs, and harmful effects on the environment. For this reason, studies on the production platform chemicals from renewable biomass resources with new technologies have increased significantly [2,3]. In our general research project, the production of levulinic acid and other valuable chemicals with Jerusalem artichoke and root of chicory, which are lignocellulosic biomass rich in inulin, was carried out with high yields. The effects of reaction temperature, reaction time, concentration, and pH value of the feed solution in the presence of catalyst on the decomposition of biomass, which is decomposed into valuable compounds by hydrothermal method, were investigated. The effects of HCl and chloride salts selected as catalysts on the yields of levulinic acid and other by-products were investigated. Hydrothermal decomposition experiments were carried out in batch reactors and in a temperature-control system (with adjustable heating rate and PID unit). Optimum experimental conditions were determined with the help of Minitab program and a model equation was derived on levulinic acid yield. The determination of the compounds in the aqueous phase and their amounts were made in the HPLC device. In the analyses made, the amounts of levulinic acid, acetic acid, and formic acid and hydroxymethyl furfural compounds were determined. As a result of the incomplete degradation of the structural components of biomass(cellulose and hemicellulose) to levulinic acid and other by-products, they were converted into sugar monomers. The amounts of monomers such as glucose, fructose, arabinose, rhamnose, cellobiose, sucrose, mannose, xylose, galactose was also determined with another analysis performed in HPLC. Keywords: Biomass, hydrothermal decomposition, levulinic acid, mineral acid, salt effect