Effect of Sodium Carbonate on the Cloud Point in Alkyl Ether/Brine Systems: Apparent Relation with Dynamic Interfacial Tension Minimum期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Effect of Sodium Carbonate on the Cloud Point in Alkyl Ether/Brine Systems: Apparent Relation with Dynamic Interfacial Tension Minimum

Authors:	Moundher Hadji Mohamed Aoudia Adil Al-Rubkhi Rashid S. Al-Maamari Amel Hadj-Ziane-Zafour

Affiliation:	1.Laboratory of Chemical Engineering,University Saad Dahlab, Blida 1,Blida,Algeria;2.Department of Chemistry,Sultan Qaboos University,Al-Khodh,Sultanate of Oman;3.Department of Petroleum and Chemical Engineering,Sultan Qaboos University,Al-Khodh,Sultanate of Oman

Abstract:	The effect of Na₂CO₃ on the cloud point in Na₂CO₃/surfactant/brine was investigated using two series of nonionic surfactants, C₁₃EO_x and C₁₇EO_x. The cloud point, T _cp, was found to decrease linearly with increasing Na₂CO₃ concentration. This was attributed to Na⁺ and particularly to CO₃ ^2?salting-out effect. The slope a = dTcp/d[Na₂CO₃] 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 CO₃ ^2?ions in solution. This was also illustrated by the linear variation of ΔT _cp = T _cp,0 ? T _cp,[Na2CO3] with the surfactant degree of ethoxylation.

Keywords:	Enhanced oil recovery Nonionic surfactant Soap Cloud point Salting‐out effect
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