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Fourth generation synthesis of solketal by glycerol acetalization with acetone: A solar-light photocatalytic approach
Journal of the Taiwan Institute of Chemical Engineers ( IF 5.7 ) Pub Date : 2021-07-03 , DOI: 10.1016/j.jtice.2021.06.035
Jesús Hidalgo-Carrillo 1 , Rafael C. Estévez-Toledano 1 , Francisco J. López-Tenllado 1 , Felipa M. Bautista 1 , Francisco J. Urbano 1 , Alberto Marinas 1
Affiliation  

Background

Biomass is the only renewable alternative to fossil fuels to produce chemicals. In this sense, glycerol is an important biomass-derived platform chemical obtained as a by-product during biodiesel generation. This paper reports for the first time the photocatalytic acetalization of glycerol with acetone to produce cyclic ketals, interesting chemicals with several applications such as solvents or (bio)fuel additives.

Methods

Commercial TiO2 (Aeroxide® Evonik P25) was used as the photocatalyst and very mild reaction conditions (30 °C, solar-simulated light) were utilized. The effect of glycerol/acetone ratio and catalyst concentration on both glycerol conversion and five-membered/six-membered ring acetal ratio was studied through factorial design of experiments. P25 concentration was in the 1–3 g/L range whereas acetone/glycerol molar ratio varied between 6 and 20.

Findings

All in all, the maximum conversion (89.6%) corresponded to 1.86 g/L and acetone/glycerol ratio of 10.96. Selectivity to the 5-membered ring ketal (solketal) was over 92% in all cases. This procedure would constitute the fourth-generation synthesis of solketal by glycerol acetalization with acetone.



中文翻译:

丙三醇与丙酮缩醛化合成第四代醇缩酮:一种太阳光光催化方法

背景

生物质是化石燃料生产化学品的唯一可再生替代品。从这个意义上说,甘油是一种重要的生物质衍生平台化学品,是在生物柴油生产过程中作为副产品获得的。本文首次报道了甘油与丙酮的光催化缩醛化反应生成环状缩酮,这是一种有趣的化学品,具有多种应用,如溶剂或(生物)燃料添加剂。

方法

使用商用 TiO 2 (Aeroxide® Evonik P25) 作为光催化剂,并使用非常温和的反应条件(30 °C,太阳能模拟光)。通过因子设计实验研究了甘油/丙酮比率和催化剂浓度对甘油转化率和五元/六元环缩醛比率的影响。P25 浓度在 1–3 g/L 范围内,而丙酮/甘油摩尔比在 6 到 20 之间变化。

发现

总而言之,最大转化率 (89.6%) 对应于 1.86 g/L 和 10.96 的丙酮/甘油比。在所有情况下,对 5 元环缩酮 (solketal) 的选择性都超过 92%。该程序将构成通过用丙酮进行甘油缩醛化的第四代醇缩酮合成。

更新日期:2021-08-03
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