Microscopy as a Reliable Tool for the Evaluation of Marine Fuels Stability

Vráblík, Aleš; Jaklová, Karolína; Bringlerová, Nikola; Schlehöfer, Dominik; Černý, Radek

doi:10.35933/paliva.2020.02.05

Cited by 2 publications

(2 citation statements)

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“…According to empirical evidence from laboratory studies monitoring the stability of marine fuels in practice, the TSA values are often higher than the TS values because of the difference in one determination. 40,42 In the case of the TSA method, we titrated the samples with n-hexadecane and then aged them for 1 h in an oil bath at 100 °C. The TSA parameter provides a more reliable guide to the colloidal stabilization of the sample than the TS parameter, which provides information only about the total sediment content.…”

Section: ■ Discussionmentioning

confidence: 99%

“…This method was tested on six laboratoryprepared marine fuels of the ISO-F-RME 180 class. 42 In this study, we considered the possibility of diluting the high-viscosity residual fraction with a component that does not disturb or that minimally disturbs the colloidal stability of the tested fraction. Concurrently, we developed a procedure for evaluating and comparing high-viscosity residual fractions and correlated the obtained results with commonly used methods for evaluating samples of this nature.…”

Section: ■ Introductionmentioning

confidence: 99%

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Evaluation of High-Viscosity Residual Fractions by Hot Filtration

Schlehöfer,

Vráblík,

Chrudimská

et al. 2023

Energy Fuels

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The high-viscosity residual fractions obtained during the secondary processing of crude oil are widely used as components in the production of marine fuels. Because of the high viscosity of these residual fractions, they cannot be used as marine fuel in accordance with the ISO 8217 standard (which monitors the quality parameters of residual marine fuels) without being mixed with a suitable low-viscosity cutter stock. Hot filtration, in accordance with the standardized procedures ISO 10307-1 and ISO 10307-2, is used to monitor the stability of the final marine fuels. However, this procedure cannot be applied to pure residual fractions because of their viscosity. We propose a procedure that does allow the application of hot filtration to determine the stability (in accordance with ISO 10307-1 and -2) of high-viscosity residual fractions. The proposed procedure involves mixing the residual fractions with a mixture of methyl esters in a suitable ratio. In this case, a 30% by weight addition of methyl esters to the tested high-viscosity residual fractions was determined to be the most suitable. The SV coefficient was employed to determine the optimal amount of the mixture of methyl ester (C ̌SN EN 14214) diluting component used to evaluate the high-viscosity residual fractions. The resulting values of TS (total sediment) and TSA (total sediment accelerated) parameters showed a high correlation, mainly for the most monitored parameter TSA, with dynamic viscosity at a temperature of 150 °C (R 2 TSA = 0.914) and C/H ratio (R 2 TSA = 0.929). Dependence of DV 150 and C/H ratio on asphaltene content representing n-heptane soluble material in residual fractions, as well as precursors of residual fraction instability, was also monitored. Determining the stability of pure residual fractions helps prevent possible technological problems arising during the storage and transport of either pure residual fractions or prepared marine fuels.

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Section: ■ Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Evaluation of High-Viscosity Residual Fractions by Hot Filtration

Schlehöfer,

Vráblík,

Chrudimská

et al. 2023

Energy Fuels

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Comparative Study of Light Cycle Oil and Naphthalene as an Adequate Additive to Improve the Stability of Marine Fuels

et al. 2022

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Post the enforcement of the Global Sulphur Cap 2020, large amounts of marine fuel have been produced as a mixture of two or more components to achieve a sulfur level of less than 0.5 wt %. This has led to the wider use of diluents or cutter stocks from different origins to comply with the quality requirements of the ISO 8217 standard. These can often be bio- or alternative components with a lower level of stability. This makes it crucial to select components that are compatible and form a homogeneous mixture. The ISO 8217 standard provides commercial and operational protection; however, the stability of the fuel deteriorates over time. Therefore, the purpose of this study was to develop an adequate component or additive to improve the colloidal stability of marine fuels. A set of laboratory-prepared samples was used to verify the positive effects of the addition of a light cycle oil and also a newly developed additive (containing 30 wt % naphthalene as the simple diaromatic hydrocarbon in tetralin). The prepared fuels (with effective additive dosage), when stored for 60 days, maintained the total sediment accelerated (TSA) parameters, confirming the stability of the fuels. The additive converted the unsaleable fuel into fuel that complied with the requirements of ISO 8217. The developed additive can be used for industrial applications in marine fuel production.

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Microscopy as a Reliable Tool for the Evaluation of Marine Fuels Stability

Cited by 2 publications

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Evaluation of High-Viscosity Residual Fractions by Hot Filtration

Evaluation of High-Viscosity Residual Fractions by Hot Filtration

Comparative Study of Light Cycle Oil and Naphthalene as an Adequate Additive to Improve the Stability of Marine Fuels

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