Reduction of Dispersion in Ultrasonically-Enhanced Micropacked Beds

TitleReduction of Dispersion in Ultrasonically-Enhanced Micropacked Beds
Publication TypeJournal Article
Year of Publication2018
AuthorsNavarro-Brull, FJ, Teixeira, AR, Zhang, J, Gomez, R, Jensen, KF
JournalIndustrial & Engineering Chemistry Research
Pagination122 - 128
Date Published2018/01/10/
ISBN Number0888-5885
Keywordscavitation, gas-liquid, liquid-liquid-extraction, mass-transfer, microfluidics, microreactors, multiphase flow, porous-media, reactors, water

Channeling of gas can reduce mass transfer performance in multiphase micropacked-bed reactors. Viscous and capillary forces cause this undesired and often unpredictable phenomenon in systems with catalyst particle sizes of hundreds of micrometers. In this work, we acoustically modify flow in a micropacked-bed reactor to reduce gas channeling by applying high power sonication at low ultrasonic frequencies (similar to 40 kHz). Experimental residence time distributions reveal two orders of magnitude reduction in dispersion with ultrasound, allowing for nearly plug-flow behavior at high flow rates in the bed. Sonication appears to partially fluidize the packed-bed under pressurized cocurrent two-phase flow, effectively improving dispersion characteristics.

Short TitleInd. Eng. Chem. Res.