Breaking of Water-in-Crude Oil Emulsions. 7. Demulsifier Performance at Optimum Formulation for Various Extended Surfactant Structures
2016; American Chemical Society; Volume: 30; Issue: 9 Linguagem: Inglês
10.1021/acs.energyfuels.6b01286
ISSN1520-5029
AutoresJosé G. Delgado‐Linares, José G. Alvarado, Francia Véjar, Johnny Bullón, Ana Forgiarini, Jean‐Louis Salager,
Tópico(s)Surfactants and Colloidal Systems
ResumoThe performance of several extended surfactants as water-in-crude oil emulsion breakers was evaluated using two criteria: (1) the demulsifier dose required (CD*) to attain the minimum stability at the so-called optimum formulation, and (2) the corresponding low minimum stability value. These surfactants were found to behave in the same way as typical commercial demulsifiers do; i.e., they require a lower dose CD* when their hydrophilicity is slightly greater. The reported data for a dozen different extended surfactants indicate how the two performance indices are altered by changing the structure characteristics, such as the propylene oxide number, the ethylene oxide number, and the ionic polar group (carboxylate, sulfate, phosphate). The best performance as a demulsifier seems to depend on the proper combination of these structures to attain a well-fitting compromise.
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