稀酸辅助离子液体1,3-二甲基咪唑磷酸二甲酯高效预处理 木薯渣厌氧发酵残渣

为了有效地糖化木薯渣厌氧发酵残渣，建立了稀酸辅助离子液体1,3-二甲基咪唑磷酸二甲酯盐（Mmim]DMP）预处理工艺。通过考察不同预处理条件对残渣酶解糖化活性的影响，确定了最适的预处理条件。进一步，通过扫描电子显微镜（SEM）和红外光谱（FT-IR）研究了预处理前后残渣纤维素微观结构的变化。结果表明：最适的预处理介质是盐酸、水和Mmim]DMP（1.5∶20∶78.5，质量比）的混合物；最适预处理温度和预处理时间分别为130℃和30min；糖化20g/L预处理的残渣96h，还原糖产率为70.9%；再生纤维素的表面及晶体结构有了明显的变化，聚合度降低，便于酶解的进行，达到了高效糖化木薯渣厌氧发酵残渣的目的。

Efficient pretreatment of biogas residues of cassava dreg by dilute acid with ionic liquid 1,3-dimethyl imidazole dimethyl phosphate system

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.