Sulfur in kukersite shale oil: its distribution in shale oil fractions and the effect of gaseous environment

Mozaffari, Sepehr; Järvik, Oliver; Baird, Zachariah

doi:10.31219/osf.io/b8x6w

Cited by 3 publications

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“…The data used for the analysis in this article was part of a larger study to investigate the properties of kukersite shale oil. The elemental composition data and additional properties of the samples studied here were given in the earlier articles by Järvik et al [12], Mozzafari et al [13], and Järvik and Oja [14], the data can also be found from the Open Science Framework repository (https://osf.io/3q5ur).…”

Section: Elemental Analysismentioning

confidence: 99%

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The composition of kukersite shale oil

Baird¹,

Oja²,

Järvik³

2023

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Pyrolysis oils are usually considered as substitutes for crude oil; however, they can also be sources of valuable compounds. One such pyrolysis oil is shale oil obtained by pyrolysis of kukersite oil shale. Kukersite shale oil consists mainly of aromatic rings with straight alkyl side chains. For samples with comparable boiling point distributions, kukersite shale oil has a higher proportion of aromatic rings than petroleum and many other shale oils. Sulfur, nitrogen, and oxygen are often incorporated into the ring structures, with much of the oxygen also present as phenolic hydroxyl groups.To evaluate the potential for producing some specific compounds from kukersite shale oil foundational data on the composition is needed. In this article, new experimental data on the elemental composition and infrared spectrum of kukersite shale oil is analyzed to investigate its composition. To get detailed information on how the composition of the oil changes depending on the average molecular weight of the oil fraction, the shale oil was separated into narrow boiling fractions using distillation. This gives more detailed data on different portions of the oil than earlier datasets. Additionally, this data is for oil produced from newer solid heat carrier retorts. The results show that the nitrogen content in kukersite shale oil increases with the boiling temperature, with the heaviest fractions containing about 0.3 wt%. Sulfur content reaches a maximum of almost 2 wt% for fractions boiling between 150 and 190 °C, and heavier fractions contain about 0.7 wt%. Similarly, the proportion of hydroxyl groups in kukersite shale oil peaks in the fraction boiling at about 320 °C, with heavier fractions containing more aromatic and alkyl functional groups. The elemental composition of kukersite shale oil is also compared to that of other shale oils.

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Section: Elemental Analysismentioning

confidence: 99%

“…Past studies have determined that the sulfur compounds in kukersite oil are mostly alkylthiophenes and thioesters, although some mercaptans and disulfides are also present [13,30,32].…”

Section: Sulfur Compoundsmentioning

confidence: 99%

The composition of kukersite shale oil

Baird¹,

Oja²,

Järvik³

2023

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“…Past studies have determined that the sulfur compounds in kukersite oil are mostly alkylthiophenes and thioesters, although some mercaptans and disulfides are also present [13], [30], [31]. This type of sulfur distribution is different from that normally seen with conventional petroleum.…”

Section: Sulfur Compoundsmentioning

confidence: 99%

“…Even Jordanian El Lajjun shale oil, which is known for its high sulfur content, shows a decrease in sulfur content in the heavier fractions [26]. A more detailed analysis of the sulfur compounds in kukersite shale oil is given in one of our other articles [13].…”

Section: Sulfur Compoundsmentioning

confidence: 99%

The composition of kukersite shale oil

Baird¹,

Järvik²,

Oja³

2022

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Pyrolysis oils are usually considered as substitutes for crude oil; however, they can also be sources of valuable compounds. One such pyrolysis oil is shale oil obtained by pyrolysis of kukersite oil shale. K shale oil consists mainly of aromatic structures with straight alkyl side chains. For samples with comparable boiling point distributions, kukersite shale oil is more aromatic than petroleum and many other shale oils. Sulfur, nitrogen, and oxygen are often incorporated into the ring structures, with much of the oxygen also present as phenolic hydroxyl groups.To evaluate the potential for producing some specific compounds from kukersite shale oil foundational data on the composition is needed. Here we analyze new data on the elemental composition and infrared spectrum of kukersite shale oil to investigate its composition. To get detailed information on how the composition of the oil changes depending on the average molecular weight of the oil fraction, the shale oil was separated into narrow boiling fractions using distillation.The results show that the nitrogen content in kukersite shale oil increases with the boiling temperature, with the heaviest fractions containing about 0.3 wt%. Sulfur content reaches a maximum of almost 2 wt% for fractions boiling between 150 and 190 °C, and heavier fractions contain about 0.7 wt%. Similarly, the proportion of hydroxyl groups in kukersite shale oil peaks in the fraction boiling at about 320 °C, with heavier fractions containing more aromatic and alkyl functional groups. The elemental composition of kukersite shale oil is also compared to that of other shale oils.

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“…H 2 S release from coal during pyrolysis in an N 2 inert atmosphere was detected by Chen et al [55], while Yani et al [56] also detected the release of H 2 S and SO 2 gases from pyrolized lignite samples. Mozaffari et al [57] showed the release of sulfur compounds in Estonian kukersite shale oil obtained using pyrolysis at temperatures lower than 520 • C; in particular, they demonstrated that the presence of steam during pyrolysis led to an increase in H 2 S release.…”

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confidence: 99%

Alterations of Carbonate Mineral Matrix and Kerogen Micro-Structure in Domanik Organic-Rich Shale during Anhydrous Pyrolysis

et al. 2022

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The study of organic-rich carbonate-containing shales after heating is an important task for the effective application of in-situ thermal kerogen conversion technologies implemented for these types of rocks. This research was conducted to study changes in the rocks of the Domanik Formation after high-temperature treatment, taking into account the nature of structural changes at the micro level and chemical transformations in minerals. The sample of organic-rich carbonate-containing shales of the Domanik Formation was treated in stages in a pyrolizer in an inert atmosphere in the temperature range of 350–800 °C for 30 minutes at each temperature. By means of X-ray powder diffractometry (XRPD), HAWK pyrolysis, light and scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and computed micro-tomography, the characteristics of the rock before and after each heating stage were studied. The results showed significant alteration of the mineral matrix in the temperature range 600–800 °C, including the decomposition of minerals with the formation of new components, and structural alterations such as fracturing micropore formation. The organic matter (OM) was compacted at T = 350–400 °C and fractured. The evolution of void space includes fracture formation at the edges between rock components, both in organic matter and in minerals, as well as nanopore formation inside the carbonate mineral matrix. The results obtained show what processes at the microlevel can occur in carbonate-containing organic-rich shales under high-temperature treatment, and how these processes affect changes in the microstructure and pore space in the sample. These results are essential for modeling and the effective application of thermal EOR in organic-rich shales.

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Sulfur in kukersite shale oil: its distribution in shale oil fractions and the effect of gaseous environment

Cited by 3 publications

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The composition of kukersite shale oil

The composition of kukersite shale oil

The composition of kukersite shale oil

Alterations of Carbonate Mineral Matrix and Kerogen Micro-Structure in Domanik Organic-Rich Shale during Anhydrous Pyrolysis

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