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Article: Solubility of sodium soaps in aqueous salt solutions

TitleSolubility of sodium soaps in aqueous salt solutions
Authors
KeywordsKrafft Point
Phase Behavior
Sodium Soaps
Solubility
Tetraalkylammonium Bromides
Issue Date2005
PublisherAcademic Press. The Journal's web site is located at http://www.elsevier.com/locate/jcis
Citation
Journal of Colloid and Interface Science, 2005, v. 291 n. 2, p. 543-549 How to Cite?
AbstractThe solubility of sodium soaps in dilute aqueous salt solutions has been systematically investigated by direct visual phase behavior observations. The added electrolytes, including simple inorganic salts and bulky organic salts, influence the solubility of sodium soaps in water, as represented by the varied soap Krafft point. Two inorganic salts, sodium chloride and sodium perchlorate, demonstrate a "salting-out" property. On the other hand, tetraalkylammonium bromides show an excellent ability to depress the soap Krafft point and enhance the soap solubility in water. With increasing the tetraalkylammonium ionic size, the degree of "salting-in" of soaps in water increases. However, solubility of pure tetraalkylammonium bromide in water decreases as the length of the alkyl chains increases. Furthermore, in the ternary water-tetrapentylammonium bromide (TPeAB)-sodium myristate (NaMy) system, we observed an upper cloud point phenomenon, which greatly shrinks the 1-phase micellar solution region in the phase diagram. This miscibility gap, together with the organic salt solubility limitation, restricts the use of tetraalkylammonium bromides with alkyl chains longer than 4 carbon atoms as effective soap solubility enhancement electrolytes. We also found that for sodium soap with a longer hydrocarbon chain, more tetrabutylammonium salt is required to reduce the soap Krafft point to room temperature. © 2005 Elsevier Inc. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/90903
ISSN
2015 Impact Factor: 3.782
2015 SCImago Journal Rankings: 1.126
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLin, Ben_HK
dc.contributor.authorMcCormick, AVen_HK
dc.contributor.authorDavis, HTen_HK
dc.contributor.authorStrey, Ren_HK
dc.date.accessioned2010-09-17T10:10:06Z-
dc.date.available2010-09-17T10:10:06Z-
dc.date.issued2005en_HK
dc.identifier.citationJournal of Colloid and Interface Science, 2005, v. 291 n. 2, p. 543-549en_HK
dc.identifier.issn0021-9797en_HK
dc.identifier.urihttp://hdl.handle.net/10722/90903-
dc.description.abstractThe solubility of sodium soaps in dilute aqueous salt solutions has been systematically investigated by direct visual phase behavior observations. The added electrolytes, including simple inorganic salts and bulky organic salts, influence the solubility of sodium soaps in water, as represented by the varied soap Krafft point. Two inorganic salts, sodium chloride and sodium perchlorate, demonstrate a "salting-out" property. On the other hand, tetraalkylammonium bromides show an excellent ability to depress the soap Krafft point and enhance the soap solubility in water. With increasing the tetraalkylammonium ionic size, the degree of "salting-in" of soaps in water increases. However, solubility of pure tetraalkylammonium bromide in water decreases as the length of the alkyl chains increases. Furthermore, in the ternary water-tetrapentylammonium bromide (TPeAB)-sodium myristate (NaMy) system, we observed an upper cloud point phenomenon, which greatly shrinks the 1-phase micellar solution region in the phase diagram. This miscibility gap, together with the organic salt solubility limitation, restricts the use of tetraalkylammonium bromides with alkyl chains longer than 4 carbon atoms as effective soap solubility enhancement electrolytes. We also found that for sodium soap with a longer hydrocarbon chain, more tetrabutylammonium salt is required to reduce the soap Krafft point to room temperature. © 2005 Elsevier Inc. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherAcademic Press. The Journal's web site is located at http://www.elsevier.com/locate/jcisen_HK
dc.relation.ispartofJournal of Colloid and Interface Scienceen_HK
dc.subjectKrafft Pointen_HK
dc.subjectPhase Behavioren_HK
dc.subjectSodium Soapsen_HK
dc.subjectSolubilityen_HK
dc.subjectTetraalkylammonium Bromidesen_HK
dc.titleSolubility of sodium soaps in aqueous salt solutionsen_HK
dc.typeArticleen_HK
dc.identifier.emailLin, B:blin@hku.hken_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jcis.2005.05.036en_HK
dc.identifier.scopuseid_2-s2.0-26444586720en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-26444586720&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume291en_HK
dc.identifier.issue2en_HK
dc.identifier.spage543en_HK
dc.identifier.epage549en_HK
dc.identifier.isiWOS:000232815500027-

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