An Automated Computer‐Vision “Bubble‐Counting” Technique to Characterise CO₂ Dissolution into an Acetonitrile Flow Stream in a Teflon AF‐2400 Tube‐in‐Tube Flow Device

O'Brien, Matthew; Moraru, Ruxandra

Abstract

AbstractA Teflon AF‐2400 based tube‐in‐tube device was used to generate flow streams of CO2 in acetonitrile and a computer‐vision based ‘bubble counting’ technique was used to estimate the amount of CO2 that had passed into solution whilst in the tube‐in‐tube device by quantifying the amount of CO2 that left solution (forming separate gas‐phase segments) downstream of the back‐pressure regulator. For both CO2 pressures used, there appeared to be a minimum residence time below which no CO2 was observed to leave solution. This was assumed to be due to residual CO2 below (or close to) the saturation concentration at atmospheric pressure and, by taking this into account, we were able to fit curves corresponding to simple gradient‐driven diffusion and which closely matched previously obtained colorimetric titration data for the same system. The estimated value for the residual concentration of CO2 (0.37 M) is higher than, but in reasonable general correspondence with, saturation concentrations previously reported for CO2 in acetonitrile (0.27 M).

Citation

O'Brien, M., & Moraru, R. (2023). An Automated Computer‐Vision “Bubble‐Counting” Technique to Characterise CO2 Dissolution into an Acetonitrile Flow Stream in a Teflon AF‐2400 Tube‐in‐Tube Flow Device. ChemPlusChem, 88(1), https://doi.org/10.1002/cplu.202200167

• Journal Article Type: Article
• Acceptance Date: Jul 1, 2022
• Online Publication Date: Aug 23, 2022
• Publication Date: 2023-01
• Publicly Available Date: Aug 24, 2023
• Journal: ChemPlusChem
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• Volume: 88
• Issue: 1
• DOI: https://doi.org/10.1002/cplu.202200167
• Keywords: General Chemistry
• Publisher URL: https://chemistry-europe.onlinelibrary.wiley.com/doi/abs/10.1002/cplu.202200167