A1 Journal article (refereed), original research (Journal article, original research)

Real-time monitoring and insights into process control of micron-sized calcium carbonate crystallization by an in-line digital microscope camera

Open Access hybrid publication

Publication Details

Authors: Aghajanian Soheil, Ruuskanen Vesa, Nieminen Harri, Laari Arto, Honkanen Markus, Koiranen Tuomas

Publisher: Elsevier

Publication year: 2021

Language: English

Related journal or series: Chemical Engineering Research and Design

ISSN: 0263-8762

eISSN: 1744-3563

JUFO level of this publication: 1

Digital Object Identifier (DOI): http://dx.doi.org/10.1016/j.cherd.2021.12.001

Permanent website address: https://www.sciencedirect.com/science/article/pii/S0263876221005025?via%3Dihub

Social media address: https://www.researchgate.net/publication/356846163_Real-time_monitoring_and_insights_into_process_control_of_micron-sized_calcium_carbonate_crystallization_by_an_in-line_digital_microscope_camera

Open Access: Open Access hybrid publication


In the present study, a crystallization monitoring unit consisting of an in-situ digital microscope camera and real-time image analysis is utilized for monitoring and control of a micron-sized, liquid-liquid crystallization of calcium carbonate. The crystallization process is integrated with a membrane contactor-based carbon dioxide capture process to demonstrate a sustainable CO2-to-chemical unit operation. The measurement probe transilluminates the crystal suspension and provides a live view from the crystallizer. In a series of open-loop experiments, the effects of several operating conditions such as feed flow rate and volumetric power on crystal size and particle count are investigated. For comparison purposes, solid product crystals are assessed with an offline laser diffraction technique. In the closed-loop experiments, the controlled variable is average particle diameter, and the manipulated variable is mixing intensity. The implemented set-point tracking PI controller generates actuating signals based on real-time image analysis measurement of the crystal size. Experimental results demonstrate a practical approach for measuring micron-sized particle suspensions, which is a challenge for particles with a mean diameter smaller than 15–20 microns, provides insights into the mixing intensity-based particle size controllability in fast-reaction precipitation systems and offers a framework to implement a direct design feedback control policy.

Last updated on 2021-09-12 at 16:56