Abstract
The Pinnick oxidation, due to its tolerance for sensitive functional groups, is widely used in the process of oxidizing α,β-unsaturated aldehydes to corresponding carboxylic acids. The reaction reagents typically include sodium chlorite, buffer salts, and a scavenger. However, the controllability of Pinnick oxidation in the batch reaction process is poor due to the inherent limitations of the reactor’s performance. This leads to potential safety risks and necessitates the reaction to proceed slowly under conditions of low temperature and low concentration. In this work, we introduced a new continuous micro-reaction process to intensify the Pinnick oxidation. The water-soluble crotonic acid was selected as a typical object of study. Through the study of reaction parameters and the construction of a micro-reaction system, efficient continuous process was achieved under high-temperature and high-pressure conditions for the first time. Compared to the batch process, the reaction benefited from the superheated condition resulting in a significant acceleration of the reaction rate, efficient gas–liquid interphase mass transfer allowing for effective utilization of the generated chlorine dioxide, and the inherent safety of the microreactor enabling an increase in reaction concentration. In addition, the buffer salts used in the Pinnick oxidation has been successfully replaced by hydrochloric acid and applied to the continuous flow. This work shows the tremendous potential of microreactors in utilizing harsh reaction conditions to achieve process intensification.
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Article Highlights
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A superheated micro-reaction process was introduced into the Pinnick oxidation to achieve efficient and safe preparation of crotonic acid.
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Efficient gas–liquid interphase mass transfer in microreactor realized effective utilization of the by-product chlorine dioxide.
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The great replacement of phosphate buffer salts with hydrochloric acid was achieved in continuous flow.
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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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The authors gratefully acknowledge the support of the National Natural Science Foundation of
The supplementary China (22108264, 22378376) for this work.
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Huang, J., Li, Y., Zhou, Y. et al. Efficient pinnick oxidation by a superheated micro-reaction process. J Flow Chem (2024). https://doi.org/10.1007/s41981-024-00324-1
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DOI: https://doi.org/10.1007/s41981-024-00324-1