Biomass‐Derived Aromatics by Solid Acid‐Catalyzed Aldol Condensation of Alkyl Methyl Ketones,Advanced Sustainable Systems

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Biomass‐Derived Aromatics by Solid Acid‐Catalyzed Aldol Condensation of Alkyl Methyl Ketones
Advanced Sustainable Systems ( IF 6.5 ) Pub Date : 2020-06-24 , DOI: 10.1002/adsu.201900150
Phillip Reif ₁ , Hannah Rosenthal ₁ , Marcus Rose ₁

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Cyclotrimerization of biomass‐based alkyl methyl ketones exhibits great potential as a route to biomass‐derived aromatics by a sustainable valorization of biorefinery streams. In this study, acetone is used as a model reagent to screen solid acid catalysts for the aldol condensation reaction to the aromatic trimer mesitylene. From a broad catalyst screening promising activity is shown by the cation exchange resin Purolite CT275DR, the beta‐zeolite H‐BEA 35, and aluminosilicate Siralox 70/170 HPV which are used to further investigate reaction parameters. Acetone conversion and mesitylene yield increase with temperature and time, while yield of the intermediate mesityl oxide decreases. This effect is also found for higher quantities of catalyst acid sites and is accompanied with an increased side product formation which negatively affects total product selectivity. Analyzing the reaction progress shows a significant drop in catalyst productivity after an initial start‐up phase. This observation is linked to a deactivation of the catalyst which involves water that is formed during the condensation reaction of acetone. Obtained results confirm the general viability of the aromatization of alkyl methyl ketones and can be considered the first step to an alternative sustainable route to biomass‐derived aromatics compared to other currently discussed routes.

中文翻译：

固体酸催化烷基甲基酮的醛醇缩合生物质衍生的芳烃

通过对生物精炼厂物流进行可持续的增值，基于生物质的烷基甲基酮的环三聚具有巨大的潜力，可作为从生物质衍生的芳烃的途径。在这项研究中，使用丙酮作为模型试剂来筛选固体酸催化剂，以进行醛醇缩合反应生成芳族三聚均三甲苯。从广泛的催化剂筛选中，阳离子交换树脂Purolite CT275DR，β-沸石H-BEA 35和硅铝酸盐Siralox 70/170 HPV表现出令人鼓舞的活性，这些物质可用于进一步研究反应参数。丙酮转化率和均三甲苯产率随温度和时间而增加，而中间均三甲苯氧化物的产率降低。对于较高量的催化剂酸位点也发现了这种效果，并且伴随有副产物形成的增加，这不利地影响了总产物的选择性。分析反应进程表明，在初始启动阶段后，催化剂的生产率显着下降。该观察结果与催化剂的失活有关，该催化剂失活涉及在丙酮的缩合反应中形成的水。获得的结果证实了烷基甲基酮芳构化的一般可行性，并且与目前讨论的其他路线相比，可以认为是生物质衍生的芳烃替代可持续路线的第一步。该观察结果与催化剂的失活有关，该催化剂失活涉及在丙酮的缩合反应中形成的水。获得的结果证实了烷基甲基酮芳构化的一般可行性，并且与目前讨论的其他路线相比，可以认为是生物质衍生的芳烃替代可持续路线的第一步。该观察结果与催化剂的失活有关，该催化剂失活涉及在丙酮的缩合反应中形成的水。获得的结果证实了烷基甲基酮芳构化的一般可行性，并且与目前讨论的其他路线相比，可以认为是生物质衍生的芳烃替代可持续路线的第一步。

更新日期：2020-06-24

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