Academic Field

Chemistry, Chemical Engineering

Faculty Mentor Name

Dr. Markus Hoffmann

Presentation Type

Poster Presentation

Abstract

Polyethylene glycol (PEG) and many nonionic surfactants related to PEG are liquid at room temperature and possess benign properties including low vapor pressure, low toxicity, biodegradability, and high solvation power due to their amphiphilicity. We also observed an appreciable ability to solvate mineral salts in contrast to traditional organic solvents. Very little is known about the solubility of mineral salts in these surfactants. For these reasons we began a systematic solubility study of a variety of mineral salts in solutions of varying ratios of water and surfactant from neat surfactant to water rich compositions. Three different surfactant/water solvent systems were evaluated: PEG200/water, C10E6/water, and C10E7P2/water. Solubility measurements were taken for NaCl, KCl, KBr, CsCl, K2HPO4 and K2SO4 using atomic absorption spectroscopy. The solubilities decreased with decreasing water content but remained appreciably high in the neat surfactants, on the order of 10 mmolal for K2SO4 to 1 molal for KBr. Some salt solutions underwent phase separation or formed gels at particular water content levels.

Keywords

Chemistry, AAS, surfactant

Start Date

10-4-2015 2:00 PM

End Date

10-4-2015 2:45 PM

Location

SERC House of Fields

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Apr 10th, 2:00 PM Apr 10th, 2:45 PM

Solubility of Mineral Salts in Binary Solvent Systems of Nonionic Surfactants and Water

SERC House of Fields

Polyethylene glycol (PEG) and many nonionic surfactants related to PEG are liquid at room temperature and possess benign properties including low vapor pressure, low toxicity, biodegradability, and high solvation power due to their amphiphilicity. We also observed an appreciable ability to solvate mineral salts in contrast to traditional organic solvents. Very little is known about the solubility of mineral salts in these surfactants. For these reasons we began a systematic solubility study of a variety of mineral salts in solutions of varying ratios of water and surfactant from neat surfactant to water rich compositions. Three different surfactant/water solvent systems were evaluated: PEG200/water, C10E6/water, and C10E7P2/water. Solubility measurements were taken for NaCl, KCl, KBr, CsCl, K2HPO4 and K2SO4 using atomic absorption spectroscopy. The solubilities decreased with decreasing water content but remained appreciably high in the neat surfactants, on the order of 10 mmolal for K2SO4 to 1 molal for KBr. Some salt solutions underwent phase separation or formed gels at particular water content levels.