Interfacial Properties and Partitioning of 4-Heptylbenzoic Acid between Decane and Water

Spildo, Kristine; Høiland, Harald

doi:10.1006/jcis.1998.5872

Cited by 25 publications

(26 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the higher IFTs seen for the calcium solutions (data set no. 4, Figure 11) has been analysed theoretically 24 , and verified experimentally by others 12,19,25 . The presence of the calcium ions leads to precipitation or binding with the naphthenic acid molecules at higher pH values, which renders them more surface inactive.…”

Section: Interfacial Tensions (Ift) Of Naphthenate Systemssupporting

confidence: 54%

A Mechanistic Study of Naphthenate Scale Formation

Shepherd¹,

Thomson²,

Westacott³

et al. 2005

Proceedings of SPE International Symposium on Oilfield Chemistry

View full text Add to dashboard Cite

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractStatic bottles tests have been conducted on model naphthenic acid solutions with the objective of studying the mechanisms of naphthenate "scale" formation. Various experimental sensitivities were analysed such as initial pH, cation type and concentration in the aqueous phase, naphthenic acid type and concentration in the oil phase. Data has been obtained for the deposits formed from sodium, calcium and barium rich aqueous phases and their combinations. Trends in precipitate mass as well as the composition of the solid deposits obtained from X-Ray diffraction (XRD) and electron microscopy/ energy dispersive x-ray (ESEM-EDX) are presented. The effects of cations on bulk and surface properties such as viscosity, emulsion stability and interfacial tension are also shown. These results contribute to the understanding of naphthenate deposition mechanisms under lab conditions.

show abstract

Section: Interfacial Tensions (Ift) Of Naphthenate Systemssupporting

confidence: 54%

A Mechanistic Study of Naphthenate Scale Formation

Shepherd¹,

Thomson²,

Westacott³

et al. 2005

Proceedings of SPE International Symposium on Oilfield Chemistry

View full text Add to dashboard Cite

show abstract

“…The local minimum in IFT observed by Rudin and Wasan (25) and Lord et al (3) was attributed to the simultaneous adsorption of the anionic and neutral forms of the acid at the interface. In the absence of a minimum, the continuous decrease in IFT with pH has been attributed to the continuous ionization of acidic groups at the interface (5,26,(29)(30)(31). The absence of any change in IFT with increasing pH in the present work can probably be attributed to a combination of using a moderately water-soluble acid in relative low concentrations and the low ionic strength used in these studies.…”

Section: Interfacial Tensionsmentioning

confidence: 48%

“…For organic acids there are reports that IFT (a) passes through a minimum as the pH increases (3,25), (b) decreases continuously with increasing pH (26,(29)(30)(31), and (c) remains unchanged as the pH increases (27). The local minimum in IFT observed by Rudin and Wasan (25) and Lord et al (3) was attributed to the simultaneous adsorption of the anionic and neutral forms of the acid at the interface.…”

Section: Interfacial Tensionsmentioning

confidence: 85%

Surface and Interfacial Properties of Octanoic Acid–Octylamine Mixtures in Isooctane–Water Systems: Influence of Acid: Amine Molar Ratio and Aqueous Phase pH

Spildo

Blokhus

Andersson

2001

Journal of Colloid and Interface Science

Self Cite

View full text Add to dashboard Cite

“…For this purpose the adsorption of benzoic and 4-heptylbenzoic acid on silica from organic phase in the presence of water has been studied in this work. Previously, 4-heptylbenzoic acid (4-HBA) was characterized with respect to its interfacial and partitioning properties in a decane/water system (18), and it was found to have many of the properties necessary to make it a good model component for wettability studies. Further, it has also been shown to alter the wettability of square glass capillaries and microscope glass slides by adsorption from decane (19), and we thus expect it to adsorb on the surface of silica particles.…”

Section: Introductionmentioning

confidence: 99%