Keogh John, Jeffrey Callum, Tiwari Manishkumar S, Manyar Haresh
School of Chemistry and Chemical Engineering, Queen's University Belfast, David-Keir Building, Stranmillis Road, BelfastBT9 5AG, U.K.
Department of Chemical Engineering, Mukesh Patel School of Technology Management and Engineering, SVKM's NMIMS University, Mumbai, 400056Maharashtra, India.
Ind Eng Chem Res. 2022 Oct 26;62(45):19095-19103. doi: 10.1021/acs.iecr.2c01930. eCollection 2023 Nov 15.
Glycerol acetins (mono-, di-, and tri) are produced via esterification with acetic acid. The acetins are commercially important industrial chemicals including their application as fuel additives, thus significant to environmental sustainability and economic viability of the biorefinery industry. Glycerol esterification with acetic acid was studied using partial tin exchanged tungstophosphoric acid supported on montmorillonite K-10 as catalysts. Partially exchanging the H ion of DTP with Sn ( = 1) increased the acidity of the catalyst and showed an increase in the catalytic activity as compared to the DTP/K-10 catalyst. A series of tin exchanged tungstophosphoric acid (20% w/w) supported on montmorillonite K-10 clay (Sn-DTP/K-10, where = 0.5-1.5) were synthesized and thoroughly characterized by using BET, XRD, FT-IR, UV-vis, and titration techniques. Among various catalysts, Sn-DTP/K-10 was found to be the most active catalyst for glycerol esterification. Effects of different reaction parameters were studied and optimized to get high yields of glycerol triacetin. A suitable kinetic model of the reaction was fitted, and the Langmuir-Hinshelwood (L-H) dual-site model was able to describe the experimental data with high agreement between the experimental and calculated results. The prepared catalyst could be recycled at least four times without significant loss of activity. The overall process is green and environment friendly.
甘油醋酸酯（单酯、二酯和三酯）通过与乙酸酯化反应制得。醋酸酯是重要的商业工业化学品，包括用作燃料添加剂，因此对生物炼制行业的环境可持续性和经济可行性具有重要意义。以负载在蒙脱石K - 10上的部分锡交换的钨磷酸为催化剂，研究了甘油与乙酸的酯化反应。用锡（= 1）部分交换DTP的H离子增加了催化剂的酸度，与DTP/K - 10催化剂相比，催化活性有所提高。合成了一系列负载在蒙脱石K - 10粘土上的锡交换钨磷酸（20% w/w）（Sn - DTP/K - 10，其中= 0.5 - 1.5），并通过BET、XRD、FT - IR、UV - vis和滴定技术进行了全面表征。在各种催化剂中，Sn - DTP/K - 10被发现是甘油酯化反应中最具活性的催化剂。研究并优化了不同反应参数的影响，以获得高产率的三醋酸甘油酯。拟合了合适的反应动力学模型，Langmuir - Hinshelwood（L - H）双位点模型能够很好地描述实验数据，实验结果与计算结果高度吻合。制备的催化剂可以循环使用至少四次而活性没有明显损失。整个过程是绿色环保的。
