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Effect of Sodium Carbonate on the Cloud Point in Alkyl Ether/Brine Systems: Apparent Relation with Dynamic Interfacial Tension Minimum
Author(s) -
Hadji Moundher,
Aoudia Mohamed,
AlRubkhi Adil,
AlMaamari Rashid S.,
HadjZianeZafour Amel
Publication year - 2016
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-016-1870-3
Subject(s) - chemistry , cloud point , pulmonary surfactant , brine , ethylene oxide , surface tension , sodium , ether , inorganic chemistry , thermodynamics , organic chemistry , physics , biochemistry , copolymer , polymer
The effect of Na 2 CO 3 on the cloud point in Na 2 CO 3 /surfactant/brine was investigated using two series of nonionic surfactants, C 13 EO x and C 17 EO x . The cloud point, T cp , was found to decrease linearly with increasing Na 2 CO 3 concentration. This was attributed to Na + and particularly to CO 3 2− salting‐out effect. The slope a = d Tcp/ d [Na 2 CO 3 ] became more and more negative as the degree of ethoxylation is increased, suggesting that the higher the number of ethylene oxide (EO) groups the stronger is the cloud point depression for a given increment in Na + and CO 3 2− ions in solution. This was also illustrated by the linear variation of Δ T cp = T cp,0 − T cp,[Na2CO3] with the surfactant degree of ethoxylation.