Atmospheric Pressure Plasma Pretreatment of Sugarcane Bagasse: The Influence of Moisture in the Ozonation Process

Abstract

Sugarcane bagasse samples were pretreated with ozone via atmospheric O2 pressure plasma. A delignification efficiency of approximately 80 % was observed within 6 h of treatment. Some hemicelluloses were removed, and the cellulose was not affected by ozonolysis. The quantity of moisture in the bagasse had a large influence on delignification and saccharification after ozonation pretreatment of the bagasse, where 50 % moisture content was found to be best for delignification (65 % of the cellulose was converted into glucose). Optical absorption spectroscopy was applied to determine ozone concentrations in real time. The ozone consumption as a function of the delignification process revealed two main reaction phases, as the ozone molecules cleave the strong carbon-carbon bonds of aromatic rings more slowly than the weak carbon-carbon bonds of aliphatic chains.

Modeling of a Microwave Plasma Driven Biomass Pyrolitic Conversion for Energy Production

“…In the present calculations, we have used as biomass representative, sugarcane bagasse (Figure ). The raw sugarcane bagasse was characterized employing the procedure described in ref . The chemical analysis revealed that the biomass is composed of (38.50 ± 0.20)% of lignin, (20.60 ± 0.30)% of hemicellulose, (36.90 ± 0.50)% of cellulose, and (2.00 ± 0.10)% of ash.…”

Applications of Low-Temperature Plasmas

“…In this sense, the research to obtain more effective ozonizers could enable economically viable processes. Ozone interaction mechanism with the biomass is relatively well known (Souza-Corrêa et al 2013b), but more research is needed to unravel the influence and the role of other radicals (e.g. singlet states of atomic and molecular oxygen, OH, H 2 O 2 ) in biomass degradation processes.…”

“…Fourier transform infrared spectroscopy (FTIR) was employed to analyze the lignin bond disruptions and morphology changes of the bagasse surface that occurred due to the ozonolysis reactions as well. Appropriate chemical characterization of the lignin content in bagasse before and after its ozonation was also carried out and the reader interested can see in this paper for more details (Souza-Corrêa et al 2013b. Sugarcane bagasse samples pretreated with ozone in a downstream of an atmospheric-pressure O 2 DBD plasma showed delignification efficiency of approximately 80 % in 6 h of treatment.…”

“…However, this method suffers from limitations, such as mass transfer problems, high cost and low catalyst stability, that diminish its economic feasibility and low environmental impact on the entire biodiesel process. Carbon nanotubes (CNTs) appear to be a promising catalyst support for biodiesel production due to their ability to overcome the limitations faced by conventional heterogeneous catalysts such as high specific area (Souza-Corrêa et al 2013b). Thus, important application is the use of functionalized CNTs as catalyst support in biodiesel production, overcoming issues such as the limitations encountered by conventional heterogeneous catalysts, the advantages offered by functionalized CNTs and possible methods to functionalize CNTs to serve as catalyst support in biodiesel production.…”

Pretratamiento de bagazo de caña de azúcar por ozonólisis para obtención de bioalcoholes: Efectos sobre la liberación de azúcares, la generación de inhibidores y las fermentaciones

“…Usually, the optimal water content for agricultural residues is higher than that observed for woods, due to their capacity to bond water. Souza-Correa et al (2013a) studied 10%, 25%, 50% and 75% (w/w) moisture content for ozonization of sugarcane bagasse, and found the optimum result at 50% moisture content. , working with sugarcane bagasse in a fixed bed reactor, achieved a 46% of glucose yield at 80% (w/w) moisture content, six percentage points more than at 40% (w/w) moisture content.…”