Measurements of diffusivity of chlorinated VOCs in heavy absorption solvents using a laminar falling film contactor

The diffusivity of VOC in absorption solvents has been determined in view to modelling the performance of G/L processes for treatment of VOC-containing gases. The laminar falling film technique was used for the examples of dichloromethane (DCM) and tetrachloroethylene (TCE), to be absorbed in 2-di-e...

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Bibliographic Details
Published in:Chemical engineering and processing 2008, Vol.47 (9), p.1478-1483
Main Authors: Hadjoudj, Reda, Monnier, Hubert, Roizard, Christine, Lapicque, François
Format: Article
Language:English
Subjects:
Applied sciences
Chemical and Process Engineering
Chemical engineering
Engineering Sciences
Exact sciences and technology
Gas–liquid absorption
Heavy organic solvents
Laminar falling film
Transfer rates
Volatile organic compounds
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Summary:The diffusivity of VOC in absorption solvents has been determined in view to modelling the performance of G/L processes for treatment of VOC-containing gases. The laminar falling film technique was used for the examples of dichloromethane (DCM) and tetrachloroethylene (TCE), to be absorbed in 2-di-ethylhexyl adipate (DEHA). The technique led to accurate results for DCM. In contrast, the moderate volatility of TCE corresponds to a low Henry's law constant; the absorption was then largely controlled by gas-side transfer, the rate of which had to be accounted for in treatment of the absorption data. Nevertheless, as discussed in the paper, the well-known technique is poorly applicable in case of too soluble gases, i.e. exhibiting Henry's constants below 1 Pa m 3 mol −1.
ISSN:0255-2701
1873-3204
DOI:10.1016/j.cep.2007.04.014