Kinetic studies of detergency. II. Effect of age,temperature, and cleaning time on rates of soil removal |
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| Authors: | M. C. Bourne W. G. Jennings |
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| Affiliation: | (1) Department of Food Science and Technology, University of California, Davis, California;(2) Present address: Dept. of Food Science and Technology, New York State Agricultural Experiment Station, Cornell University, Geneva, N. Y. |
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| Abstract: | The effects of variation in temperature, flow rate, cleaning time, and age were studied in a model circulation system. The results are recorded as changes in the rate constants k1 and k2 and changes in the relative proportions of the two soil species. The removal of tristearin in this simple system was found to proceed by two independent mechanisms, acting simultaneously. The first, named the “flow mechanism,” is dependent on time, and its rate increases with flow rate. The second, which the authors term the “Dupré mechanism,” is not dependent upon time and arises from the air-detergent interface that moves over the surface. The Dupré effect is independent of flow rate at all rates of flow. In most of the experiments the Duprè mechanism accounted for about 90% of the removal of tristearin. A comparison is made between the removal of monomolecular films and thin polymolecular films. It is shown that the empirical finding of apparently simple first-order kinetics is not inconsistent with the complex processes that remove tristearin from the surface. |
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