PART 1: EXTENDED MEETING ABSTRACTS
RESEARCH ON THE PRETREATMENT OF RAPE STRAW TO REDUCE THE PRODUCTION OF BIOETHANOL ENERGY
Xu Jin1,2, Zhong Wei1*, Ji Rong1. 1School of Management ,Tianjin University of Technology, Tianjin Hong Qi south road extension of Tianjin University of Technology 300384, China; 2School of Environmental Science and Technology, Tianjin University, Tianjin 300072, China. *Corresponding Author email@example.com.
Introduction: Bioethanol production from lignocellulose needs at least 4 steps: pretreatment, enzymatic hydrolysis, fermentation, and distillation. In the 4 steps, distillation is a huge energy consumption process. In the former experiments, most of the enzymatic hydrolysis and fermentation process were carried out at 10% solid content. Under this condition, the theoretical concentration of ethanol from fermentation is 3% (w/w), and in general, the actual concentration of ethanol can be obtained only by 70%. So, the final concentration of ethanol is lower than 3% (w/w) which will cause a big energy consumption in distillation process.
Method: The chemical composition of remaining solid after pretreatment by diluted sulfuric acid was determined using the standard Laboratory Analytical Procedures for biomass analysis provided by the National Renewable Energies Laboratory (Colorado) (NREL, 2007). The released sugar monomers in the hydrolysate as well as concentrations of ethanol were determined by HPLC (Agilent) using a column (BioRad Aminex HPX-87H, 300 × 7.8 mm) at 64°C and 4 mM H2SO4 as eluent at a flow rate of 0.6 mL min−1.
The yield of rapeseed straw and bioethanol production value of 2013 and 2014 was estimated based on the yield of rapeseed straw of a city in southwest China between 2008 and 2012.
Results: Table 1 showed that the cellulose content in the pretreated rapeseed straw improved by 20% compared with raw material (data not shown) because of the hydrolysis of hemicellulose during pretreatment.
Figure 2 showed that the final concentration …