Partition of fatty acids

Simpson, Richard B.; Ashbrook, J. Douglas; Santos, Elsa C.; Spector, Arthur A.

doi:10.1016/s0022-2275(20)36790-0

Cited by 46 publications

(15 citation statements)

References 23 publications

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“…26,27 In all cases, the most extensive corrosion, in terms of mass loss and pitting, occurred on WE1, which was deployed in ASW, and the extents of WE1 corrosion exceeded that of the uninoculated incubation (Table 1). In all cases, B20 FAME metabolism resulted in production of acetic acid and a decrease in ASW pH, but we also point out that the pH of ASW in uninoculated incubations also decreased, likely due to partitioning of fatty acids into the ASW 36,37 (Figure 2c,d). Y. lipolytica yielded the greatest acetic acid accumulation and induced the lowest ASW pH (Figure 2c,d) but induced neither the greatest amount of pitting nor mass loss (Table 1).…”

Section: Resultsmentioning

confidence: 62%

“…WE1 and WE2 were alternatingly positioned in either ASW or B20, with WE1 in ASW of one chamber and WE2 in B20 of the other chamber referred to as Arrangement 1 and WE1 in B20 of one chamber and WE2 in ASW of the other chamber referred to as Arrangement 2. In both configurations, no current was observed in uninoculated incubations and acetate did not accumulate, but a decrease in pH was observed in ASW as fatty acids from the B20 partitioned into the aqueous layer 36,37 (Figure 3b,c). The decrease in pH in uninoculated incubations likely led to slightly enhanced mass loss and pitting of electrodes immersed in ASW compared to those in biodiesel (Table 2).…”

Section: Offset Zra Incubationsmentioning

confidence: 99%

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Novel Mechanism of Microbially Induced Carbon Steel Corrosion at an Aqueous/Non-aqueous Interface

Miller

Sadek

Crouch

et al. 2020

Ind. Eng. Chem. Res.

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Microbially influenced corrosion (MIC) is a common problem in biodiesel storage tanks. Here, thick microbial growths develop at and span aqueous/non-aqueous fluid interfaces. MIC in this setting was investigated in experiments using zero-resistance ammetry (ZRA) measurements. To mimic the water–fuel interface, one carbon steel coupon was deployed in B20 biodiesel and one carbon steel coupon was deployed in medium mimicking storage tank sump water, and current between the two coupons was measured. ZRA incubations were inoculated with fungi isolated from contaminated B20 biodiesel storage tanks. Corrosion on both coupons was the greatest in incubations with a fungus whose filaments penetrated the diesel fuel layer, while organisms that did not explore the fuel induced corrosion only on the coupon immersed in water and not on the coupon immersed in the fuel. Subsequent ZRA experiments indicated that current between steel coupons was only achieved when fungal hyphae penetrated the non-aqueous layer, and this resulted in the most extensive corrosion of the coupons. We call this corrosion aqueous/non-aqueous interfacial MIC (ANI-MIC).

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Section: Resultsmentioning

confidence: 62%

Section: Offset Zra Incubationsmentioning

confidence: 99%

Novel Mechanism of Microbially Induced Carbon Steel Corrosion at an Aqueous/Non-aqueous Interface

Miller

Sadek

Crouch

et al. 2020

Ind. Eng. Chem. Res.

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“…In the second category of experiments, SA was added into decane at a concentration of 0.1 mM to mimic the polar components that naturally exist in many types of crude oils. SA has a carboxyl head (−COOH) and a long alkane tail (−(CH 2 ) 16 CH 3 ) with a high partition ratio between alkane and water . These characteristics make SA molecules prone to accumulation at the oil–brine and oil-calcite interfaces.…”

Section: Resultsmentioning

confidence: 99%

“…SA has a carboxyl head (−COOH) and a long alkane tail (−(CH 2 ) 16 CH 3 ) with a high partition ratio between alkane and water. 35 These characteristics make SA molecules prone to accumulation at the oil−brine and oilcalcite interfaces. This SA−decane mixture, labeled as the moderately polar oil (MPO), was used to measure oil−brine CAs in systems involving the base brine and Brine solutions 20D, 20D-NaCl, and 20D-noCa (i.e., diluted base brine without calcium ion).…”

Section: ■ Introductionmentioning

confidence: 99%

Wettability of Calcite Surfaces: Impacts of Brine Ionic Composition and Oil Phase Polarity at Elevated Temperature and Pressure Conditions

2020

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The interactions among the polar components of oil, aqueous phase ions, and carbonate minerals, as well as their subsequent effects on surface wettability, can significantly impact the fluid distribution and recovery in a hydrocarbon reservoir. In this study, we investigate the adsorption/ desorption of molecules from oils with different levels of polarity on calcite surfaces during different displacement processes under elevated pressure and temperature conditions. We measured dynamic contact angles (CA) on untreated and aged calcite substrates using brines with different salinities and compositions and model oils, that is, mixtures of varying concentrations of stearic acid (SA) and n-decane. In particular, the impacts of the concentrations of Ca 2+ , SO 4 2− , and OH − ions on the adsorption phenomena were explored. For the nonpolar oil, increasing brine salinity or removing Ca 2+ ions from the aqueous phase impacted the potentials of oil−brine and brine−mineral interfaces and shifted the wettability of calcite surface toward more water-wet conditions. In the presence of polar oil, the adsorption of the polar components controls the surface wettability. Higher concentrations of Ca 2+ /SO 4 2− could facilitate/obstruct the polar component adsorption and thus increase/decrease the dynamic oil−water CAs. It is also observed that the brine salinity does not impact the wettability if excess SA is added to the oil phase, that is, if the oil phase is strongly polar. Moreover, the adsorption of SA on the calcite surface under experimental conditions is found to be reversible during the displacement events. The surface energy calculation for the adsorption process indicates that the surface coverage of calcite by SA is more sensitive to the presence of Ca 2+ in brine than the concentration of polar components in oil. We also conducted several experiments on calcite substrates aged with SA. The measurements demonstrate that the adsorbed SA molecules are detached when the aged mineral surface is exposed to a lower-salinity brine at high temperatures, and the SA molecules could be adsorbed back on the surface once the displacement is halted.

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“…One obvious problem is the lack of log P values for the higher carboxylic acids, only a few values for the water/heptane system, P(hept), being available. [28][29][30] These are given in Fig. 2 Outline of the indirect method.…”

Section: Methodsmentioning

confidence: 99%

The determination of air/water partition coefficients for alkyl carboxylic acids by a new indirect method

Abraham

2003

J. Environ. Monitor.

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The air/water partition coefficients of carboxylic acids, Kw, especially those of high molecular weight, are very difficult to determine directly. Values of Kw can be obtained by an indirect method as Kw = K/P where K is an air/solvent partition coefficient and P is the corresponding water/solvent partition coefficient. In the present method, gas-liquid chromatographic data and water/solvent partition data are used to obtain 'descriptors' of carboxylic acids that can then be used to determine the required K, P, and thus Kw values. These are reported for all the 24 n-alkyl carboxylic acids from formic acid to n-tetracosanoic acid, and for seven branched chain alkyl carboxylic acids. There is good agreement with literature values of Kw, where available, although the present data on the n-alkyl carboxylic acids is much more self consistent than the literature data.

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Partition of fatty acids

Cited by 46 publications

References 23 publications

Novel Mechanism of Microbially Induced Carbon Steel Corrosion at an Aqueous/Non-aqueous Interface

Novel Mechanism of Microbially Induced Carbon Steel Corrosion at an Aqueous/Non-aqueous Interface

Wettability of Calcite Surfaces: Impacts of Brine Ionic Composition and Oil Phase Polarity at Elevated Temperature and Pressure Conditions

The determination of air/water partition coefficients for alkyl carboxylic acids by a new indirect method

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