Preliminary study of pretreatment technology in the process of ethanol manufacturing using annual ryegrass

Took annual ryegrass (Lolium multifolorum) variety Abundant as material to study the pretreatment technology of ethanol fuel manufacturing transformation. The results suggested that the optimum conditions of pretreatment by H2SO4 were that 1% H2SO4 at 120 ℃ for 2 h, with 20-40 granularities and the liquid/solid ratio of 8∶1. While the optimum conditions of NaOH pretreatment were that 10% NaOH at 100 ℃ for 2 h, with 20-40 granularities and liquid/solid ratio of 6∶1. Both of tests indicated that the temperature was the most important factor. The pretreatment by H2SO4 could remove 91.6% hemicelluloses and purify 60.1% cellulose effectively, while NaOH pretreatment could remove 64.2% lignin, it was basis for further enzymatic hydrolysis process.