(579e) Optimization for Technological Conditions of Magnetic Ferric Oxide/SO42- Biomass-based Solid Acid Catalyzed Hydrolysis Corn Straw to Prepare Levulinic Acid Using Response Surface Methodology

Li, X. - Presenter, Henan Key Lab of Biomass Energy
Lei, T. - Presenter, Henan Academy of Science
Wang, Z., Henan Academy of Sciences
Chen, G., Henan Academy of Sciences
Xu, H., Henan Academy of Sciences
Guan, Q., Henan Key Lab of Biomass Energy
Li, Z., Henan Key Lab of Biomass Energy
The optimization of the process conditions for preparing levulinic acid which used magnetic ferric oxide/SO42- biomass-based solid acid as catalyst to was investigated using response surface methodology (RSM). Four parameters, namely those of Quality of Liquid-Solid Ratio (QLSR), Amount of Catalyst (AC), Hydrolysis Temperature (HT) and Hydrolyzation Duration (HD) were chosen as variables. The mathematical model of quadratic polynomial on the levulinc acid of P value was less than 0.0001, the loss of quasi P value is less than 0.01, the considerably high R2 value (0.9969) indicated the statistical significance of the model and reached extremely significant level; CV = 3 % < 10 %, the experiment had most high credibility and accuracy. The optimal process conditions for preparing the levulinic acid yield (LAY) were determined by analyzing the response surface’s three-dimensional surface polt and contour polt, and by solving the regression model equation with Design Expert software. The Box-Behnken design (BBD) was used to optimize the process conditions, which showed that the most favorable dosages of QLSR, AC, HT, and HD were 17.2:1 (V/W, mL:g), 3 g, 249 °C, 67.3 min, respectively. Under the optimized conditions, the maximum LAY was 15.82 %, and the predictive value was 15.81 %, which the relative deviation between them was 0.01 %, this model is good repeatability. This shows that using this model to optimize the technology of magnetic ferric oxide/SO42- biomass-based solid acid catalyst corn stalk of hydrolysis to prepare of levulinic acid is feasible.

Keywords: Magnetic Ferric Oxide/SO42- Biomass-based Solid Acid; Levulinic Acid; Optimization; Response Surface Methodology; Box-Behnken design