通过 SnCl4 催化剂在水相和两相体系中直接将木聚糖型半纤维素转化为糠醛。
Direct transformation of xylan-type hemicelluloses to furfural via SnCl₄ catalysts in aqueous and biphasic systems.
机构信息
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
出版信息
Bioresour Technol. 2015 May;183:188-94. doi: 10.1016/j.biortech.2015.02.068. Epub 2015 Feb 21.
Direct catalytic transformation of xylan-type hemicelluloses to furfural in the aqueous system and the biphasic system were comparatively investigated under mild conditions. Screening of several promising chlorides for conversion of beech xylan in the aqueous system revealed the Lewis acid SnCl4 was the most effective catalyst. Comparing to the single aqueous system, the bio-based 2-methyltetrahydrofuran (2-MTHF)/H2O biphasic system was more conducive to the synthesis of furfural, in which the highest furfural yield of 78.1% was achieved by using SnCl4 as catalysts under the optimized reaction conditions (150°C, 120 min). Additionally, the influences of xylan-type hemicelluloses with different chemical and structural features from beech, corncob and bagasse on the furfural production were studied. It was found that furfural yield to some extent was determined by the xylose content in hemicelluloses and also had relationships with the molecular weight of hemicelluloses and the degree of crystallization.
在温和条件下，比较了在水相体系和双相体系中直接催化转化木聚糖型半纤维素为糠醛。在水相体系中对几种有前途的氯化物进行了转化桦木聚糖的筛选，结果表明路易斯酸 SnCl4 是最有效的催化剂。与单一水相体系相比，基于生物的 2-甲基四氢呋喃（2-MTHF）/H2O 双相体系更有利于糠醛的合成，其中在优化反应条件（150°C，120 min）下使用 SnCl4 作为催化剂时，糠醛的最高收率为 78.1%。此外，还研究了来自桦木、玉米芯和甘蔗渣的具有不同化学和结构特征的木聚糖型半纤维素对糠醛生产的影响。结果发现，糠醛的收率在一定程度上取决于半纤维素中的木糖含量，并且与半纤维素的分子量和结晶度有关。
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