Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Salting-in and salting-out effects of organic and inorganic ammonium salts on the aqueous polymer solutions

Ebrahimi, Nosaibah, Farahbod, Boshra, Sadeghi, Rahmat
J. Chem. Thermodyn. 2018, 123, 86-98
ABSTRACT
This paper accomplishes a broad survey of the salting effects of different ammonium salts on the aqueous polymer solutions. In order to cover a wide range of hydrophilic and hydrophobic nature of solutes, salts including ammonium chloride (NH4Cl), ammonium bromide (NH4Br), tetraethyl ammonium bromide (TEAB), tetrapropyl ammonium bromide (TPAB), tetrabutyl ammonium bromide (TBAB), tetrabutyl ammonium chloride (TBAC), and dodecyl trimethyl ammonium bromide (DTAB), and polymers polyethylene glycol (PEG400 and PEG10000) and polypropylene glycol (PPG400 and PPG1000) have been used. In the first part of this work, cloud point temperatures (TC) for binary system of PPG1000 in pure water and for ternary systems of PPG1000 in aqueous solutions of ammonium salts have been determined by visual observation. It is shown that while the inorganic ammonium salts (NH4Cl and NH4Br) reduce the TC values of PPG1000 aqueous solutions (salting-out effect), the organic ammonium salts (TEAB, TPAB, TBAB, TBAC, DTAB) because of hydrocarbon portions in their structure favourably interact with PPG1000 and elevate the TC values (salting-in effect). The values of salting coefficient and energetic parameters of clouding process have been calculated. In the second part of this work, the isopiestic equilibrium has been investigated for several ternary {polymer + ammonium salt + water} systems at 298.2 K. Three different types of constant water activity curves deviation from the linear isopiestic relation (LIR) were observed: negative deviations for systems which undergo salting-out phenomenon and phase separation, positive deviations for systems which undergo salting-in effect, and non-deviation for semi-ideal solutions. The effects of type and molar mass of polymers, and type of cation and anion of ammonium salts on the magnitude and type of salting effects have been scrutinized.
Compounds
# Formula Name
1 C8H20BrN tetraethylammonium bromide
2 C12H28BrN tetrapropylammonium bromide
3 C16H36BrN tetrabutylammonium bromide
4 C16H36ClN tetrabutylammonium chloride
5 C15H34BrN dodecyltrimethylammonium bromide
6 BrH4N ammonium bromide
7 ClH4N ammonium chloride (NH4Cl)
8 H2O water
Datasets
The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type Compound-# Property Variable Constraint Phase Method #Points
  • POMD
  • 7
  • 8
  • (Relative) activity - 8 ; Liquid
  • Molality, mol/kg - 7; Liquid
  • Pressure, kPa; Liquid
  • Temperature, K; Liquid
  • Liquid
  • ISOPIE
  • 9
  • POMD
  • 6
  • 8
  • (Relative) activity - 8 ; Liquid
  • Molality, mol/kg - 6; Liquid
  • Pressure, kPa; Liquid
  • Temperature, K; Liquid
  • Liquid
  • ISOPIE
  • 9
  • POMD
  • 1
  • 8
  • (Relative) activity - 8 ; Liquid
  • Molality, mol/kg - 1; Liquid
  • Pressure, kPa; Liquid
  • Temperature, K; Liquid
  • Liquid
  • ISOPIE
  • 9
  • POMD
  • 2
  • 8
  • (Relative) activity - 8 ; Liquid
  • Molality, mol/kg - 2; Liquid
  • Pressure, kPa; Liquid
  • Temperature, K; Liquid
  • Liquid
  • ISOPIE
  • 11
  • POMD
  • 3
  • 8
  • (Relative) activity - 8 ; Liquid
  • Molality, mol/kg - 3; Liquid
  • Pressure, kPa; Liquid
  • Temperature, K; Liquid
  • Liquid
  • ISOPIE
  • 16
  • POMD
  • 4
  • 8
  • (Relative) activity - 8 ; Liquid
  • Molality, mol/kg - 4; Liquid
  • Pressure, kPa; Liquid
  • Temperature, K; Liquid
  • Liquid
  • ISOPIE
  • 10
  • POMD
  • 5
  • 8
  • (Relative) activity - 8 ; Liquid
  • Molality, mol/kg - 5; Liquid
  • Pressure, kPa; Liquid
  • Temperature, K; Liquid
  • Liquid
  • ISOPIE
  • 8