摘要
本研究提出了螺旋挤压耦合超低酸喷雾协同瞬时弹射汽爆(SCT/ULAS/ICSE)预处理新方法,以蔗渣、蔗髓、玉米秸秆、玉米芯和小麦秸秆为研究对象,考察了该工艺的预处理效果及能耗影响。研究结果表明:5种原料经螺杆挤压和0.1%(体积分数)H_(2)SO_(4)喷雾处理后,在160℃,5 min,0.618 MPa汽爆条件下,均保留了92%~94%的纤维素。汽爆残渣加酶(酶用量25 FPU/g,以绝干残渣为基准)水解反应72 h后,蔗渣纤维素酶解得率(65.1%),与未处理原料相比提高了44.9%;玉米秸秆半纤维素酶解得率(55.6%)与未处理原料相比提升了45.3%。5种原料水解液中的抑制物均含量极低,其中甲酸和乙酸最高仅0.34 g/L(玉米秸秆)和4.67 g/L(蔗渣)。该预处理工艺处理5种原料消耗的单位能耗总体接近且较低,最高仅为1.4 kJ/g(蔗渣)。
In this study,a new method of screw extrusion coupled with ultra-low acid spray synergistic instantaneous catapult steam explosion(SCT/ULAS/ICSE)pretreatment was proposed.Bagasse,cane pith,corn stalk,corncob and wheat straw were used as research objects to investigate the pretreatment effect and energy consumption of the process.The results showed that after screw extrusion and 0.1%(volume fraction)H_(2)SO_(4)spray treatment,the five raw materials retained 92%-94%cellulose at 160℃,5 min,and 0.618 MPa steam explosion conditions.After enzymatic hydrolysis of steam explosion residue(enzyme dosage 25 FPU/g,absolute dry residue as the basis)for 72 h,the enzymatic hydrolysis yield of cellulose from bagasse(65.1%)was 44.9%higher than that of untreated raw materials.Meanwhile,the enzymatic hydrolysis yield of hemicellulose(55.6%)from corn straw increased 45.3%compared with untreated raw material.The contents of inhibitors in the hydrolysates of the five raw materials were extremely low,where the highest contents of formic acid and acetic acid were only 0.34 g/L(corn stalk)and 4.67 g/L(bagasse).The unit energy consumption of the five raw materials treated by this pretreatment process was generally similar and low,with the maximum of only 1.4 kJ/g(bagasse).
作者
钟禹
朱若楠
任俊莉
王欢
杜风光
ZHONG Yu;ZHU Ruonan;REN Junli;WANG Huan;DU Fengguang(State Key Laboratory of Pulp and Paper Engineering,School of Light Industry and Engineering,South China University of Technology,Guangzhou 510641,China;Egozhuo New Energy Saving Technology(Shanghai)Co.,Ltd.,Shanghai 200000,China)
出处
《生物质化学工程》
CAS
2024年第5期11-20,共10页
Biomass Chemical Engineering
基金
国家重点研发计划课题资助项目(2021YFC2101601)。
关键词
禾本科
超低酸
汽爆
能耗
酶水解
Poaceae
ultra-low acid
steam explosion
energy consumption
enzymatic hydrolysis
