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Study of Dilute Sulfuric Acid Pretreatment of Corn Stover

Author: LiangYing
Tutor: ZhangYiMin
School: Tianjin University
Course: Environmental Chemical Engineering
Keywords: Biomass Corn stover Hemicellulose Dilute sulfuric acid Response Surface Methodology Dynamics
CLC: TQ352
Type: Master's thesis
Year: 2007
Downloads: 459
Quote: 7
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Abstract


Biomass is the earth's most abundant renewable resource, it is rich in hemicellulose, hydrolysis and fermentation to get a variety of compounds or energy by chemical or biological means. Xylose is an important chemical products, it is also the raw material of the production of xylitol and xylose through biomass conversion. Hydrolysis of hemicellulose is one of the most effective methods of dilute sulfuric acid pretreatment method. In this paper, a dilute sulfuric acid pretreatment of corn straw process, different conditions of hydrolysis pretreatment results. Kinetic equation of dilute sulfuric acid pretreatment of corn stover under different reaction conditions by response surface methodology (RSM) design experiments, and by means of statistical software and find the optimum conditions under the experimental conditions. First explore the influencing factors of the dilute sulfuric acid pretreatment of corn stover. The sulfuric acid concentration, reaction temperature, solid-liquid ratio, particle size, and reaction time, the influence of the change on the hydrolysis efficiency. The hydrolysis rate is higher for each single factor in the range corresponding to. Single factor experiments based on the reaction temperature to 121 ℃ under different sulfuric acid concentration and reaction time on the corn stover hemicellulose hydrolyzate xylose yield and selectivity coefficient. Xylose yield and selectivity coefficient of sulfuric acid concentration and reaction time of two binary quadratic polynomial mathematical model has been in line with the xylose yield greater than 75%, the correlation coefficient with the model equations and statistical software greater than 4.0g / g hydrolysis conditions and find sulfuric acid concentration of 2.0%, hydrolysis time 43min optimum conditions. Under conditions of low temperature (100 ℃), different concentration of sulfuric acid (2% to 6%) and reaction time (0min ~ 300min) corn stover hemicellulose hydrolysis kinetic analysis obtained under the reaction conditions in corn stalks hemicellulose hydrolysis process kinetic parameters and constants on xylose, glucose and furfural. Dilute sulfuric acid hydrolysis of corn stover optimal reaction conditions under the temperature conditions of the sulfuric acid concentration of 5.5%, reaction time 90min, the hydrolyzate product concentration of xylose 19.91 g / L glucose, 7.61 g / L, of furaldehyde 0.84 g / L. Under conditions of low temperature (80 ℃), different concentration of sulfuric acid (2% to 6%) and reaction time (0min ~ 300min) corn stover hemicellulose hydrolysis kinetic analysis obtained under the reaction conditions in corn stalks hemicellulose hydrolysis process kinetic parameters and constants on xylose, glucose and furfural. Obtained under the temperature conditions, the optimum reaction conditions are dilute sulfuric acid hydrolysis of corn stalks is 6% of the sulfuric acid concentration, reaction time 240min, the hydrolyzate product concentration are xylose 13.54 g / L, glucose 5.39 g / L , furfural 1.05 g / L, respectively.

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