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Abstract
A way to characterize (classify) frothers using gas hold-up as a surrogate for bubble size was explored. Nine surfactants with a range in chemical structures were selected and tested in a bubble column instrumented to measure gas hold-up and superficial gas velocity. A correlation between frother type and gas hold-up was observed: for alcohols, gas hold-up increases with hydrocarbon chain length and the effect is the same whether the chain is branched or straight; for polyglycols, gas hold-up increased with the number of propoxy groups. The ranking by gas hold-up gave the same result as other, more complex frother characterization techniques.
A way to characterize (classify) frothers using gas hold-up as a surrogate for bubble size was explored. Nine surfactants with a range in chemical structures were selected and tested in a bubble column instrumented to measure gas hold-up and superficial gas velocity. A correlation between frother type and gas hold-up was observed: for alcohols, gas hold-up increases with hydrocarbon chain length and the effect is the same whether the chain is branched or straight; for polyglycols, gas hold-up increased with the number of propoxy groups. The ranking by gas hold-up gave the same result as other, more complex frother characterization techniques.
On a exploré une manière de caractériser (de classifier) les moussants en utilisant la rétention de gaz comme substitut de la taille de bulle. On a choisi neuf surfactants ayant une gamme de sructures chimiques et on les a évalués dans une colonne à bulle instrumentée pour mesurer la rétention de gaz et la vitesse superficielle du gaz. On a observé une corrélation entre le type de moussant et la rétention de gaz: pour les alcools, la rétention de gaz augmente avec la longueur de la chaîne d'hydrocarbures et l'effet est le même que la chaîne soit branchée ou droite; pour les polyglycols, la rétention de gaz augmentait en fonction du nombre de groupes propoxy. L'ordre d'après la rétention de gaz a donné le même résultat que d'autres techniques plus complexes de carctérisation des moussants.
