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[Display omitted] • A monolithic reactor with multi-jet-channel in the circumferential array is constructed. • Two jets unaligned-impinging induces unsteady flow with local eddies and interface deformation. • The degree of two-phase dispersion is higher in the helical channel with a smaller pitch. • The throughput increases by over tenfold with the condition of a higher K L a value. A monolithic reactor with multi-jet-channel in the circumferential array (MR-MJCCA) is designed to intensify mass transfer. Effects of operating conditions and geometric parameters on the mass transfer efficiency E and overall volumetric mass transfer coefficient K L a are illustrated through experimental and numerical methods. Results show that the increased jet impingement intensity due to a higher flow rate and smaller jet diameter D p effectively enhances mass transfer. E and K L a in the MR-MJCCA possessing eight channels increase with reducing the channel depth D e and helical pitch p , yet first rise and then decline with enlarging the jet unaligned-impinging distance w. A higher two-phase interfacial area and energy dissipation rate are conducive to improving mass transfer performance in configurations with D p = 0.3 mm, D e = 1 mm, p = 5 mm, and w = 1.5 mm. Increasing the axial length of reactor elevates E whereas K L a diminishes. A reliable artificial neural network model was used to correlate K L a with key parameters. MR-MJCCA exhibits a higher K L a compared to most microreactors and the throughput increases by over tenfold, demonstrating its scalability and broader industrial applications. [ABSTRACT FROM AUTHOR]