Mass transfer rates to and from drops in liquid-liquid extraction equipment are often likely to be reduced by the presence of surface active contaminants. For industrial column design circumstances it is ideally required to account for the extent of contamination in a quantitative manner yet existing design procedures do not allow this to be done for the typical intermediate Reynolds number region of 10 to 100. A method is proposed for correcting continuous phase and drop mass transfer coefficients for the deleterious effects of contamination using only one contamination parameter which needs to be determined experimentally.Les taux de transfert de matibre des gouttes ou vers les goiittes dans un syseme d'extraction liquide-liquide peuvent souvent &re reduits par la prksence de contaminants de surface actifs. Pour la conception d'une colonne industrielle, idkalement, il est nkessaire de tenir compte de I'ampleur de la contamination de faGon quantitative alors que les prockdures de conception existantes ne le permettent pas pour les nombres de Reynolds intermMiaires de 10 h 100. On propose donc une mkthode visant h comger les coefficients de transfert de matibre des gouttes et de la phase gaseuse pour les effets ntcifs de la contamination bas& sur un parambtre de contamination unique h dkterminer exp6rimentalement.
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