Kinetic studies of detergency. I. Analysis of cleaning curves

Abstract

The kinetics of removal of thin films of pure radioactive tristearin from a stainless‐steel surface by .03M NaOH was studied in a circulation system. The data obtained are consistent with the presence of two species of tristearin, each species being removed simultaneously by a first‐order process and behaving independently of the other. The principal evidence for the existence of the two species is the excellent agreement of the experimental data with the mathematical techniques of kinetics over a wide range of experimental conditions. Rate constants for the removal of each species and the relative proportions of the two species are given for different experimental conditions. It is shown that the difference between the two species must be based on some physical factor, and possible explanations are discussed. The presence of two species gives a satisfactory explanation for hitherto unexplained results of other workers.

Kinetic Study of Desorption of Two Species of Bovine Serum Albumin from Alumina during Alkali Elution Process

“…It was also shown that k f was influenced by θ, whereas k s was independent on θ. Only a few studies have so far been reported concerning the analysis of desorption curves based on the concept of two types of adsorbates (15,(20)(21)(22). Although it is difficult to compare the rate constants reported in the literature with the values obtained in this study because elution conditions differ largely from each other, some phenomena identical to the results of this study were observed.…”

“…Although it is difficult to compare the rate constants reported in the literature with the values obtained in this study because elution conditions differ largely from each other, some phenomena identical to the results of this study were observed. Bourne and Jennings (21,22) studied the removal of tristearin from stainless steel by circulation cleaning with 0.03 M NaOH solution at 65…”

“…A slower-desorbing species 2 was suggested to be more closely associated with the stainless steel surface than species 1. In addition, they pointed out that cleaning curves obtained by several workers for diverse systems could be described by the sum of two first-order processes at different rates (20)(21)(22). The concept of two soil species and analytical technique are thought to be applicable to the analysis of the overall curve of desorption of irreversibly adsorbed protein through broadly weak and strong interactions with a solid surface.…”

“…Bourne and Jennings (21,22) first proposed that two species of tristearin were present in a multilayer on stainless steel, a species 1 being removed at a fast rate and a species 2 being removed at a slow rate, and that each of species 1 and 2 was removed independently and simultaneously according to a first-order process. A slower-desorbing species 2 was suggested to be more closely associated with the stainless steel surface than species 1.…”

Investigations to Increase Cleaning Efficiency with Pulsed Liquid Jet

“…Diese intermittierende Pulsation wird auch als Impuls/PauseBetrieb bezeichnet. Das grundsätzliche Verbesserungspotenzial der pulsierenden Spritzreinigung zur Reduzierung des Ressourceneinsatzes wurde von Bourne und Jennings [10] anhand von Untersuchungen in einem Rohrleitungssystem mit Fettverschmutzung durch periodisches Entwäs-sern gezeigt. Bourne und Jennings bezeichneten die Ursache für diese verbesserte Reinigungswirkung als Dupré-Effekt und beschrieben den Einfluss des Grenzflächenwech-sels Luft/Reinigungsflüssigkeit an der verschmutzten Ober-fläche als maßgeblich.…”