关键词: 毛竹竹屑, 蒸煮助剂, 硫酸盐蒸煮, 低用碱量, 酶水解

Abstract: In this work,kraft pulping with low alkali dosage was carried out on moso bamboo residues as a pretreatment.62.35% lignin was removed in kraft pulping pretreatment with 10% effective alkali charge,20% sulfidity,160 ℃,and 1 h holding time.Consequently,the yields of glucose and xylose were about 56.04% and 53.47%,respectively,with enzymatic saccharification of the pretreated sample for 48 h.Meanwhile,the effects of cooking additives,i.e.,sodium borohydride,sodium tripolyphosphat,and 2-anthraquinone sodium sulfonate,on bamboo residues composition and enzymatic hydrolysis after kraft pulping pretreatment were investigated.The results indicated that cooking additives had positive effects on the cellulose recovery,degree of delignification,and enzymatic digestibility of pretreated bamboo residues.Among them,the 2-anthraquinone sodium sulfonate had the maximal effects.When the dosage of 2-anthraquinone sodium sulfonate was 0.15%,the cellulose recovery and delignification rate were 94.93% and 68.55%,respectively,and increased by 5.45% and 9.94% than those of blank;the glucose and xylose hydrolysis yields in the enzymatic hydrolysis of pretreated sample for 48 h were 62.88% and 58.97%,respectively,which increased by 12.21% and 10.29% compared with those of blank.

Key words: Moso bamboo residues, cooking additives, kraft pulping, low alkali charge, enzymatic hydrolysis