玉米秸秆连续氢解制备生物乙醇

目前由纤维素制生物乙醇的工艺主要由生物酶解法实现,但酶解法的效率低且经济性差;此外,生物酶发酵每产生1 mol乙醇的同时副产1 mol CO2,导致原子经济性低.本文开发了一种通过连续氢解玉米秸秆纤维素转化为高浓度生物乙醇(6.1％)的工艺.首先使用绿色溶剂(80 wt％1,4-丁二醇)在不破坏木质素结构的前提下,提取...

Production of bio-ethanol by consecutive hydrogenolysis of corn-stalk cellulose

Current bio-ethanol production entails the enzymatic depolymerization of cellulose, but this process shows low efficiency and poor economy. In this work, we developed a consecutive aqueous hydro-genolysis process for the conversion of corn-stalk cellulose to produce a relatively high concentra-tion of bio-ethanol (6.1 wt％) without humin formation. A high yield of cellulose (ca. 50 wt％) is extracted from corn stalk using a green solvent (80 wt％ 1,4-butanediol) without destroying the structure of the lignin. The first hydrothermal hydrogenolysis step uses a Ni-WOx/SiO2 catalyst to convert the high cumulative concentration of cellulose (30 wt％) into a polyol mixture with a 56.5 C％ yield of ethylene glycol (EG). The original polyol mixture is then subjected to subsequent selec-tive aqueous-phase hydrogenolysis of the C-O bond to produce bioethanol (75％ conversion, 84 C％selectivity) over the modified hydrothermally stable Cu catalysts. The added Ni component favors the good dispersion of Cu nanoparticles, and the incorporated Au3+ helps to stabilize the active Cu0-Cu+ species. This multi-functional catalytic process provides an economically competitive route for the production of cellulosic ethanol from raw lignocellulose.