CAJ | 학술논문

将生物质原料直接转化制备乙酰丙酸甲酯(MLE)具有经济价值高、对环境友好和可持续性强等优点.详细研究了 Lewis 酸(Sn-β 分子筛)、Br?nsted 酸(对甲苯磺酸,PTSA)及混合酸(Sn-β/PTSA)在葡萄糖直接转化合成乙酰丙酸甲酯中的催化效果,取得了较高的产物收率.首先,将各种分子筛和 PTSA 组合成催化体系并将其应用于葡萄糖醇解合成 MLE 的反应过程,发现 Sn-β 分子筛与 PTSA 的混合体系效果最佳(其中,Sn-β 分子筛是借助简单的研磨法制备),产物 MLE 的收率可达 68.3%左右.进而,对分子筛催化剂进行了 XRD、FT-IR 和 TG-DTG等表征;由实验结果可知,Sn-β 分子筛的主要作用在于将葡萄糖异构生成果糖,而 PTSA 的催化作用是加速醇解过程;最后,针对催化剂组分的比例、反应时间和反应温度进行了优化,得到了最佳反应条件.
장생물질원료직접전화제비을선병산갑지(MLE)구유경제개치고、대배경우호화가지속성강등우점.상세연구료 Lewis 산(Sn-β 분자사)、Br?nsted 산(대갑분광산,PTSA)급혼합산(Sn-β/PTSA)재포도당직접전화합성을선병산갑지중적최화효과,취득료교고적산물수솔.수선,장각충분자사화 PTSA 조합성최화체계병장기응용우포도당순해합성 MLE 적반응과정,발현 Sn-β 분자사여 PTSA 적혼합체계효과최가(기중,Sn-β 분자사시차조간단적연마법제비),산물 MLE 적수솔가체 68.3%좌우.진이,대분자사최화제진행료 XRD、FT-IR 화 TG-DTG등표정;유실험결과가지,Sn-β 분자사적주요작용재우장포도당이구생성과당,이 PTSA 적최화작용시가속순해과정;최후,침대최화제조분적비례、반응시간화반응온도진행료우화,득도료최가반응조건.
The efficient synthesis of methyl levulinate (MLE) from biomass feedstock using catalytic process is high economic, environment-friendly and sustainable in chemical industry. Herein, the catalytic performance of Lewis acid, Br(o)sted acid and mixed acid on the conversion of glucose to MLE is investigated in detail, and a satisfactory product yield is obtained. First, the different molecular sieves are combined with p-toluenesulfonic acid (PTSA) and employed as the catalysts for the direct transformation of glucose to MLE, in which the combination of Sn-β molecular sieve (being synthesized through a simple grinding method) and PTSA is the most efficient. The highest yield of MLE is about 68.3%. Furthermore, the catalyst is characterized by XRD, FT-IR and TG-DTG techniques. It is found that Sn-β can mediate the isomerization of glucose to fructose and PTSA mainly promote the alcoholysis reaction based on the experimental results and corresponding phenomena in the reaction. At last, the effects of Sn-β / PTSA ratio, reaction time and reaction temperature are studied, and the optimized conditions are obtained.