Preparative thin-layer chromatography and high-resolution mass spectrometry of crude oil carboxylic acids

Seifert, Wolfgang; Teeter, Richard M.

doi:10.1021/ac60275a027

Cited by 45 publications

(23 citation statements)

References 25 publications

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“…Naphthenic acids (NAs) refer to a complex suite of alkyl‐substituted acyclic and cycloaliphatic carboxylic acids . The analytical studies showed that approximately 1500 acids were detected in the NAs mixtures . The complexity of NAs mixtures makes the detection of all the ozonation intermediates or transformed NAs almost an impossible task.…”

Section: Resultsmentioning

confidence: 99%

Heterogeneous catalytic ozonation of naphthenic acids in water

jibouri

Upreti

2018

Can J Chem Eng

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A major challenge the oil sands industries are facing is the urgent need to treat large amounts of oil sands process‐affected water (OSPW). OSPW is toxic to many species mainly due to the presence of naphthenic acids (NAs). Ozonation can significantly reduce both concentration and toxicity of the NAs. Unfortunately, this method suffers from its relatively high cost. To enhance NAs removal, we initiated heterogeneous catalytic ozonation of synthetic OSPW. Two types of catalysts were investigated: i) alumina supported metal oxides, and ii) unsupported catalysts. The alumina supported oxides included MnO2, MnO2/Co3O4, and MnO2/Li2O, while the unsupported catalysts were alumina and activated carbon (AC). All tested catalysts enhanced the ozone removal of NAs. Specifically, AC was found to be a very effective catalyst in addition to its adsorbability. AC significantly enhanced the removal of NAs and COD, the detoxification of the OSPW, and the biodegradability of NAs. For 85 % removal of NAs, the AC catalyzed ozonation needed 15 min whereas over 45 min were required by its non‐catalyzed counterpart. By using AC catalyzed ozonation, the efficiencies of detoxification and COD removal were both over four times and the biodegradability of the synthetic OSPW was over five times of those treated by non‐catalyzed ozonation. The mechanism study confirmed that due to the presence of AC the hydroxyl radical concentration increased 31 %, resulting in 26.4 % reduction in ozone consumption compared to non‐catalyzed ozonation. The removal of NAs was enhanced because of the higher oxidation power of hydroxyl radicals than molecular ozone.

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Section: Resultsmentioning

confidence: 99%

Heterogeneous catalytic ozonation of naphthenic acids in water

jibouri

Upreti

2018

Can J Chem Eng

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show abstract

“…Naphthenic acids (NAs) refer to a complex suite of alkyl‐substituted acyclic and cycloaliphatic carboxylic acids . The analytical studies showed that approximately 1500 acids were detected in the NA mixtures . The complexity of NA mixtures makes the detection of all the ozonation intermediates almost an impossible task.…”

Section: Resultsmentioning

confidence: 99%

“…[4,27] The analytical studies showed that approximately 1500 acids were detected in the NA mixtures. [28] The complexity of NA mixtures makes the detection of all the ozonation intermediates almost an impossible task. As a consequence, the ozone consumption by the intermediates was not considered.…”

Section: Mass Balance Of Dissolved Ozonementioning

confidence: 99%

Application of mass balance models in the process of ozone removal of naphthenic acids from water

jibouri

Upreti

2016

Can J Chem Eng

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The oil sands process‐affected water (OSPW), produced in large amounts during the extraction of crude oil from oil sands, is toxic mainly due to the presence of naphthenic acids (NAs), among other constituents. Ozonation is an effective method for the removal of NAs. To provide information for better control of NAs ozonation, models based on mass balance were developed in this study to predict the concentration profiles of commercial NAs, dissolved ozone, and gaseous ozone during the process. It was found that the developed models successfully predicted the concentrations of commercial NAs and gaseous ozone. For the dissolved ozone concentration, the developed model can predict the equilibrium concentrations well. However, the actual ozone consumption was higher than that predicted by the model at the initial period of the ozonation process. This deviation possibly resulted from the inapplicability of the gas‐liquid equilibrium conditions at the initial high rate stage of the reaction. In addition, the Henry's law constant and the overall mass transfer coefficient for the given system were determined experimentally. Also investigated in this study was the effects of inlet gaseous ozone concentration into the reactor on the removal of NAs and on the concentration of dissolved ozone. As expected, the increase in inlet ozone concentration enhanced the removal of NAs and increased the concentration of dissolved ozone.

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“…From a similar study Kaiser [224] advocated the "coupling" of TLC with MS. In a further application, preparative TLC has been used to reduce the complexity of a crude oil carboxylic acid fraction to fractions containing about 1500 compounds, which were examined by high-resolution measurement of the molecular ions [225]. Since a 50 mg amount of crude sample was applied to the plate, individual compounds were only present in pg quantities (Fig.…”

Section: B Ms Of Microquantities Of Materials Purified By Other Methodsmentioning

confidence: 99%

Spectroscopic Methods of Identification of Microquantities of Organic Materials

Ayling¹

1974

Applied Spectroscopy Reviews

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Preparative thin-layer chromatography and high-resolution mass spectrometry of crude oil carboxylic acids

Cited by 45 publications

References 25 publications

Heterogeneous catalytic ozonation of naphthenic acids in water

Heterogeneous catalytic ozonation of naphthenic acids in water

Application of mass balance models in the process of ozone removal of naphthenic acids from water

Spectroscopic Methods of Identification of Microquantities of Organic Materials

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