AlCl_3对纤维素高温液态水中水解反应的影响

Effect of AlCl_3 on Cellulose Hydrolysis in High Temperature Liquid Water

以微晶纤维素为模型化合物,研究了AlCl3对其在高温液态水(HTLW)中的水解反应的影响。液相产品分析显示,AlCl3能够促进纤维素水解,降低水解反应温度,并在短时间内提高葡萄糖的收率。在T=260℃,P=5.2±0.2 MPa,t=1 min,体系中加入0.01%(质量百分浓度)的AlCl3可以将纤维素的转化率提高至73.86%;葡萄糖的收率达到最大为47.73%。同时,AlCl3的存在可以抑制葡萄糖的异构化反应及逆醇醛缩合反应,改变葡萄糖降解产物的分布。XRD及SEM分析结果显示AlCl3能够有效的破坏纤维素的晶体结构。

The effect of AlCl3 on hydrolysis of microcrystalline cellulose in high temperature liquid water（HTLW） was investigated.The HPLC results show that AlCl3 can accelerate the hydrolysis of cellulose and reduce the hydrolysis temperature.It can also promote the yield of glucose within short residence time.By adding 0.01% AlCl3,the conversion of cellulose was increased to 73.86% at 260 ℃,（5.2±0.2） MPa and 1 min while the maximum yield of glucose（47.73%） was approached.As an acid catalyst,AlCl3 can inhibit the isomerization and the retro-aldol condensation of glucose which can influence the product distribution of the hydrolysate.XRD and SEM analysis showed that AlCl3 can destroy the crystal structure of cellulose effectively.