| Autor: |
Weil, J. K., Pierce, C. J., Linfield, W. M. |
| Zdroj: |
Journal of the American Oil Chemists' Society; December 1976, Vol. 53 Issue: 12 p757-761, 5p |
| Abstrakt: |
Blends of soap and surfactants that possess good lime soap dispersing properties were dispersed in hard water. The turbidity of such dispersions varied depending on the type of dispersant used and also on the soap:dispersant ratio. Differences in coarseness of various dispersions could be measured empirically by filtration through a membrane of intermediate (1.2 µm) porosity. For determinations of the chemical composition of the dispersions a somewhat finer membrane (0.8 µm or less) was chosen, which retained most of the dispersed solids. Filter residues and filtrates were analyzed for sodium, calcium, magnesium and lime soap dispersing agents (LSDA). All of the calcium remained on the filter, whereas sodium was found primarily in the filtrate. Magnesium was held completely on the filter only if sufficient soap was present to tie up all Ca++and Mg++. Analysis of the organic portion of the residues indicated that the soap:LSDA ratio found was the same as that used in the preparation of the original dispersion. On filtration through a fine membrane (0.05 µm) virtually all dispersed material was retained on the membrane. The filtrate possessed only slight activity in terms of surface tension and detergency, whereas the resuspended solids possessed high surface activity similar to the unfiltered dispersion. This indicates that the dispersed solids are the major source of surface activity. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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