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PHASE BEHAVIOR OF BRANCHED TAIL ETHOXYLATED CARBOXYLATE SURFACTANT/ELECTROLYTE/ALKANE SYSTEMS. |
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| Authors: | Masahiko ABE Robert S. SCHECHTER Robert D. SELLIAH Baharuddin SHEIKH William H. WADE |
| Affiliation: | 1. Department of Industrial and Engineering Chemistry , Faculty of Science and Technology Institute of Colloid and Interface Science, University of Tokyo , 2641, Noda, Chiba, 273, Japan;2. Department of Chemistry , The University of Texas at Austin , Austin, Texas, 78712;3. Department of Chemical Engineering , The University of Texas at Austin , Austin, Texas, 78712;4. Department of Chemistry , The University of Texas at Austin , Austin, Texas, 78712 |
| Abstract: | This paper describes the effect of pH on phase behavior of branched tail EO carboxylate surfactants in electrolyte/ alkane microemulsion system3 which are of possible pertinence to enhanced oil recovery. The pH of the aqueous surfactant solutions was found to have a considerable effect on the salinity requirement for middle phase microemulsion formation. At 70 and 60°C alcohol-free optimal three phase microemulsion systems are formed with all alkanes studied over the entire pH range of 6-12. At lower temperatures and. higher pH values, liquid crystals were found to form in systems which contained lower molecular weight alkanes. |
| Keywords: | Cysteine Hexacyanoferrate(III) AOT Oxidation |