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Predicting Spontaneous Emulsification in Saltwater Environments Using the HLD Model.

Cole R Davis1, Carlos J Martinez1, John A Howarter1,2

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Summary

Salt concentration significantly impacts spontaneous emulsification of toluene using surfactants like NPE and SDBS. Higher NaCl levels enhance emulsification, with mechanisms varying by surfactant type.

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Area of Science:

  • Colloid and Surface Science
  • Physical Chemistry
  • Materials Science

Background:

  • Spontaneous emulsification is crucial for forming nanoemulsions and remediating wastewater.
  • Understanding the role of salts and surfactants in emulsion formation is key.

Purpose of the Study:

  • To investigate spontaneous emulsification of toluene with nonylphenol polyethoxylate (NPE) and sodium dodecylbenzenesulfonate (SDBS) in saltwater.
  • To determine the influence of NaCl concentration on emulsification spontaneity and mechanisms.
  • To model spontaneous emulsification using Hydrophilic Lipophilic Difference (HLD).

Main Methods:

  • Utilized dynamic light scattering and turbidity measurements.
  • Performed Hydrophilic Lipophilic Difference (HLD) calculations.
  • Analyzed toluene-surfactant systems in varying NaCl concentrations.

Main Results:

  • NaCl promoted spontaneous emulsification in otherwise non-spontaneous SDBS-toluene systems.
  • Emulsification spontaneity increased with rising NaCl concentration.
  • NPE emulsified via micelle swelling; SDBS emulsified via nucleation and growth.
  • Spontaneous emulsification occurred as HLD values approached zero, specifically between -2.4 and -2.05.

Conclusions:

  • NaCl concentration is a critical factor influencing spontaneous emulsification in toluene-surfactant systems.
  • The mechanism of spontaneous emulsification is surfactant-dependent.
  • HLD is a valuable tool for predicting and modeling spontaneous emulsification in saltwater environments.