Abstract
In this research, the effects of three different pretreatment methods, physical pulverizing, steam blasting and hydrogen peroxide oxidizing, on ethanol preparation from corn straw were compared. The results showed that the content of reducing sugar in corn straw briquette with grinding and steam blasting pretreatment were 2 and 1.5 times higher than that without pretreatment. In the final product, the concentration of ethanol and rate of alcohol increased about 3.8 and 2 times, respectively. Besides, the reducing sugar content, ethanol content and alcohol yield in corn stalks soaked in hydrogen peroxide were 7 times higher than the untreated. The cellulose can be effectively isolated after being soaked in hydrogen peroxide with a concentration of 2.5% for 72 hours, as well as better degradation of lignin and hemicellulose. The amount of ethanol and the yield of alcohol were 1.9 and 3.3 times higher than physical pulverization and steam blasting. In brief, it is declared that hydrogen peroxide pretreatment can easily destroy the lignocellulosic cellulose of maize straw and improve the conversion rate of cellulose, which might be beneficial for the production of fuel ethanol.
Highlights
1 Introduction the crystal structure of cellulose [3]
Study on the enzymatic hydrolysis of wheat straw pulverized pretreatment that the surface area of straw pulverization increases with the increase of comminution degree, and the surface binding point increases with the increase of enzyme hydrolysis rate [5].The relationship between the pretreatment of steam blast and the hydrolysis rate of corn stalk cellulase was found, cellulose hydrolysis rate increased with the increase of the blasting pressure and increase pressure time, when the steam pressure is 1.6MPa and 9min dimensional pressure time, obtained cellulase hydrolysis yield was 75.76%[6]
3.1 The effects of different pretreatment methods on the components of corn straw. It can be found in table 1, the content of corn straw cellulose, hemicellulose and lignin after steam explosion pretreatment were all decreased
Summary
1 Introduction the crystal structure of cellulose [3]. Studies on the production of ethanol from switchgrass and hemp were. Acid or alkali treatment mainly uses acids, alkali or organic solvents as pretreatment reagent to remove lignin, or break the connection of wood carbon water complexes, or destroy shown that using switch grass and marijuana as raw materials to produce ethanol can obtain the alcohol with 16g.L-1 and 11g.L-1 ethanol concentration respectively after physical crushing pretreatment, and the concentration of ethanol in the control group without pretreatment was 14.6g.L-1 and 8.66g.L-1[4]. The corn stalk that was crushed to 0.2-0.4 cm, the bursting pressure is controlled at 80KPa and the blasting time is 30min and pretreatment with the concentration of 2.5% hydrogen peroxide. The effect of several pretreatments on the ethanol production of corn straw was compared with the standard and analytical method
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