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Reduction of Dispersion in Ultrasonically-Enhanced Micropacked Beds

Author:
Navarro-Brull, Francisco J., Teixeira, Andrew R., Zhang, Jisong, Gómez, Roberto, Jensen, Klavs F.
Source:
Industrial & engineering chemistry process design and development 2018 v.57 no.1 pp. 122-128
ISSN:
1520-5045
Subject:
catalysts, mass transfer, particle size, process design, sonication, ultrasonics
Abstract:
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 (∼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.
Agid:
6019475