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Process Monitoring of Antisolvent Based Crystallization in Low Conductivity Solutions Using Electrical Impedance Spectroscopy and 2-D Electrical Resistance Tomography

1
Institute of Applied Computer Sciences, Lodz University of Technology, 90-924 Lodz, Poland
2
Separation Science Department, Lappeenranta University of Technology, 90-924 Lappeenranta, Finland
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(11), 3903; https://doi.org/10.3390/app10113903
Received: 11 May 2020 / Revised: 26 May 2020 / Accepted: 29 May 2020 / Published: 4 June 2020
(This article belongs to the Section Applied Industrial Technologies)
Industrial process monitoring is an important field of research where different chemical processes are monitored and controlled. In this work, electrical impedance spectroscopy (EIS) was used to analyze antisolvent based crystallization of sucrose solutions. The impedance and phase spectra were recorded for four known sucrose concentrations in water, and for each case, four predetermined amounts of ethanol were added. As a result, sixteen different solutions involving sucrose solutions of different concentrations and ethanol to water ratios were analyzed. Significant differences were observed in the magnitude and phase spectra of the solutions in the frequency range of 50 kHz to 300 kHz. The experimentally obtained data from the EIS were converted into frequency response models. Three continuous-time transfer function models of the first-order, second-order, and a second-order with a zero were estimated and compared. In addition, a 2-D electrical resistance tomography (ERT) system with a low conductivity sensor unit was designed and tested with demineralized water, tap water and industrial food grade saturated sucrose solution. Non-conducting phantom and sugar crystals were observed within the saturated sucrose solution using the Bayesian reconstruction algorithm. These demonstrations have the potential to be developed into a multi-frequency ERT systems for monitoring the distribution of the crystals in the reactor. The EIS modality can be a complementary process analytical technology (PAT) tool indicating supersaturation status and provide quality assurance. View Full-Text
Keywords: impedance spectroscopy; antisolvent sucrose crystallization; electrical resistance tomography; industrial process monitoring; data-driven models impedance spectroscopy; antisolvent sucrose crystallization; electrical resistance tomography; industrial process monitoring; data-driven models
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MDPI and ACS Style

Rao, G.; Aghajanian, S.; Koiranen, T.; Wajman, R.; Jackowska-Strumiłło, L. Process Monitoring of Antisolvent Based Crystallization in Low Conductivity Solutions Using Electrical Impedance Spectroscopy and 2-D Electrical Resistance Tomography. Appl. Sci. 2020, 10, 3903.

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