关键词: 离子液体, 盐酸, 木薯渣厌氧发酵残渣, 预处理, 糖化

Abstract: To effectively saccharify the biogas residues of cassava dreg，a biomass pretreatment process was developed using acidized ionic liquid，1,3-dimethyl imidazole dimethyl phosphate ([Mmim]DMP) solution，scontaining dilute acid. An investigation was designed to evaluate the effects of different pretreatment conditions on the saccharification of biogas residues. Moreover，the micro-structure changes of cellulosic material before and after pretreatment were recorded by SEM and FT-IR. After the optimization，the appropriate pretreatment system was the mixture of hydrochloric acid，deionic water and [Mmim]DMP (1.5∶20∶78.5，mass ratio). The optimum pretreatment temperature and time were 130℃ and 30 min，respectively. After the saccharification for 96h，the yield of reducing sugars from 20g/L pretreated cellulosic materials was 70.9%. Significantly，the crystal structure and surface of the regenerated cellulosic material had obviously changed，and the degree of polymerization was reduced. As consequence，the fragmental and porous regenerated with amorphous structure could provide more surfaces for enzymes to attack on. Therefore，high saccharification for the biogas residues of cassava dreg could be achieved.

Key words: ionic liquid, hydrochloric acid, biogas residue of cassava dreg, pretreatment, saccharification