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Millifluidics for Chemical Synthesis and Time-resolved Mechanistic Studies

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Published on: November 27, 2013

Compartmentalized Droplets for Continuous Flow Liquid-Liquid Interface Catalysis.

Ming Zhang^1,2, Lijuan Wei¹, Huan Chen¹

¹School of Chemistry and Chemical Engineering, Shanxi University , Taiyuan 030006, China.

Journal of the American Chemical Society

|July 19, 2016

Summary

We developed Flow Pickering Emulsion (FPE), a novel continuous flow method for biphasic catalysis. This technique immobilizes water-soluble catalysts in droplets, enhancing reaction efficiency up to tenfold compared to batch methods.

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Area of Science:

Chemical Engineering
Catalysis
Flow Chemistry

Background:

Batch organic-aqueous biphasic catalysis faces limitations hindering efficiency and scalability.
Continuous flow processing offers advantages but requires innovative approaches for biphasic systems.

Purpose of the Study:

To introduce a novel continuous flow method, Flow Pickering Emulsion (FPE), for processing organic-aqueous biphasic reactions.
To overcome limitations of traditional batch biphasic catalysis through an innovative liquid-liquid interface protocol.

Main Methods:

Development of FPE using water-in-oil Pickering emulsions to compartmentalize water-soluble catalysts within micron-sized droplets in a column reactor.
Experimental and theoretical investigation of oil phase flow, droplet stability, and catalyst confinement within the FPE system.
Demonstration of FPE versatility through case studies involving acid-catalyzed addition, ring opening, and enzyme-catalyzed chiral reactions.

Main Results:

Successful implementation of FPE for continuous flow biphasic catalysis, demonstrating catalyst immobilization and efficient organic phase flow.
Case studies confirmed the generality and versatility of FPE across different reaction types.
FPE reactions exhibited excellent durability and up to a 10-fold enhancement in reaction efficiency compared to batch processes, attributed to a flow interface catalysis effect.

Conclusions:

FPE provides a sustainable and efficient flow chemistry approach for conventional biphasic catalysis.
The method enables enhanced reaction efficiency and catalyst retention, opening new avenues for process intensification.
FPE represents a significant advancement in liquid-liquid interface protocols for continuous flow reactions.