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

doi:10.1002/cplu.202200167

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

Authors

Matthew O'Brien m.obrien@keele.ac.uk

Ruxandra Moraru

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).

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