Yields and the selected physicochemical properties of thermobitumen as an intermediate product of the pyrolysis of Kukersite oil shale

Albert, T; Astra, H-L; Järvik, Oliver; Kamenev, S.; Karagöz, Selhan; Mozaffari, Sepehr; Oja, Vahur; Yanchilin, A. B.

doi:10.3176/oil.2021.4.02

Cited by 2 publications

(1 citation statement)

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“…To the best of our knowledge, no previous attempt has been made to model the wet air oxidation of oil shale through kinetic calculations. Earlier, the focus has been on the mechanisms of shale oil formation, which are usually roughly divided into two sequential stages -first the formation of thermobitumen, then volatiles [21,22]. This paper proposes that the oxidation of kukersite by molecular oxygen at significantly lower temperatures can also be formally divided into two distinctive steps and that these steps can be distinguished by CO 2 formation.…”

Section: Introductionmentioning

confidence: 99%

A two-step model for assessing the potential of shale-derived chemicals by oxidation of kukersite

Mets,

Lopp,

Uustalu

et al. 2023

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The organic matter in oil shale (kerogen) contains vast potential as its structure is rich in easily convertible and versatile building blocks. Due to the complex structure of kerogen, simplifications are often used in order to obtain any information about the mechanism of its processing. This paper presents an approximate two-stage kinetic model which has been constructed to describe the wet air oxidation (WAO) process of the kerogen of Estonian kukersite oil shale, i.e. an alternative oil shale treatment process. The results obtained highlight the basic mechanisms of oil shale oxidation by molecular oxygen in water into different products. These outcomes add to the already existing knowledge on the structure of kerogen and validate it. The composed two-stage reaction formula outlines a fast reaction period which describes the dissolution of organic material, followed by a slower oxidation of dissolved substances. The attained high dissolution rate of kukersite kerogen illustrates the potential for recovering feedstock chemicals. The rate constants found remained independent of the oxygen-to-carbon ratio and good agreement was observed between calculated kinetic curves and experimental values.

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Section: Introductionmentioning

confidence: 99%