Thermal Processing Limits of Athabasca Bitumen during Visbreaking Using Solubility Parameters

Rahimi, Parviz; Teclemariam, Alem; Taylor, Ed; Debruijn, Theo J. W.; Wiehe, Irwin A.

doi:10.1021/bk-2005-0895.ch013

Cited by 23 publications

(38 citation statements)

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“…1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 On the contrary, visbreaking was operated at a conversion of less than 0.33 to prevent coke formation. 24 I y Q (once through) seemed to suppress coke formation the most effectively at high conversion levels.…”

Section: Product Yield and Conversionmentioning

confidence: 98%

Comparison of Thermal Cracking Processes for Athabasca Oil Sand Bitumen: Relationship between Conversion and Yield

et al. 2014

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This study compared various thermal cracking processes for Athabasca oil sand bitumen according to the relationship between vacuum residue (VR) conversion and the product yield for each process, using reported data. The conversion was defined as the fraction of VR which was converted to lighter products. The conventional processes examined were visbreaking, delayed coking, and fluid coking, and the developing processes were high conversion soaker cracking (HSC), heavy to light (HTL), I y Q, Eureka, and supercritical water cracking (SCWC). HSC and SCWC were higher severity visbreaking-type processes with conversions of 0.49 and 0.39-0.50, respectively. HTL and I y Q_(recycle) were lower severity fluid coking-type processes with a conversion of 0.52. I y Q (once through), and Eureka showed the highest conversions (0.62-0.68).Supercritical water (SCW) upgrading was operated experimentally at higher severity, with a conversion of 0.64, and showed the highest yield of distillate product (DP) among all thermal cracking processes investigated.Analysis of the conversion-yield relationship revealed the thermal cracking behavior of Athabasca bitumen. The key for achieving higher conversions with lower coke yield was considered to be efficient mass transfer of the volatile fraction stripped away from condensed phase which is liquid fraction at the experimental condition. The condensed-phase decomposition showed an upper limit of conversion of 0.55, and that with high mass-transfer system exceeded 0.65.

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Section: Product Yield and Conversionmentioning

confidence: 98%

Comparison of Thermal Cracking Processes for Athabasca Oil Sand Bitumen: Relationship between Conversion and Yield

et al. 2014

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“…The reaction time and temperature are two important variables that greatly affect cracking efficiency of the heavy molecules. Therefore, to evaluate the efficiency of the experiments at different conditions, a parameter called reaction severity index (SI) including both variables of temperature and reaction time was used, according to Rahimi et al and Gray [23,24]:…”

Section: Experimental Methodsmentioning

confidence: 99%

Supercritical water treatment of oil sludge, a viable route to valorize waste oil materials

Radfarnia

Khulbe

Little

2015

Fuel

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“…However, it is quite possible that the relationship between vacuum residue conversion and olefin content of the oil will not be linear due to the impact of hydrogen disproportionation. With increasing vacuum residue conversion, the visbroken product also comes closer to the flocculation point that could affect subsequent oil blending and phase stability …”

Section: Technologies For Partial Upgradingmentioning

confidence: 99%

Processing Unconventional Oil: Partial Upgrading of Oilsands Bitumen

Klerk

2021

Energy Fuels

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Unconventional oil, irrespective of whether it is a bio-oil, coal oil, petroleum oil, or waste oil, is an oil that is too viscous to effectively transport in its native state. Processing of unconventional oil to enable transport is imperative to get the oil to its primary market, namely, petroleum refineries. What is the most profitable amount of processing to meet the technical requirements for transport and marketability of the oil product? The impact of oil composition on petroleum refining is discussed in terms of refinery constraints and petroleum economics. The constraints explored are distillation, sulfur treatment capacity, hydrogen availability, and crack spread. Using oilsand-derived bitumen as a case study, three different approaches to deliver unconventional oil to the market are presented: dilution without any upgrading, full upgrading by the combination of cracking and hydroprocessing, and partial upgrading without the use of hydrogen. The concept of partial upgrading assumes that there is an economical optimum amount of processing between the two extremes of dilution and full upgrading. Potential partial upgrading processes that are reviewed are limited to the categories of visbreaking, coking, solvent deasphalting, and olefin treating without hydrogen. Comparative material balances, oil properties, capital costs, and utility requirements are presented and discussed in the context of partial upgrading. The study concludes that there is a limited prospect for single-step partial upgrading processes to produce an oil with sufficiently reduced viscosity, density, and olefin content to meet pipeline specifications without a substantial yield loss. Cracking necessitates olefin treatment, and process options for olefin treatment without hydrogen are less well developed than olefin treatment with hydrogen. While not concluding that multistep processes cannot meet the dual objectives of increasing profitability and transport requirements, it is pointed out that increasing complexity erodes the economic incentive by which partial upgrading is justified.

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Thermal Processing Limits of Athabasca Bitumen during Visbreaking Using Solubility Parameters

Cited by 23 publications

References 0 publications

Comparison of Thermal Cracking Processes for Athabasca Oil Sand Bitumen: Relationship between Conversion and Yield

Comparison of Thermal Cracking Processes for Athabasca Oil Sand Bitumen: Relationship between Conversion and Yield

Supercritical water treatment of oil sludge, a viable route to valorize waste oil materials

Processing Unconventional Oil: Partial Upgrading of Oilsands Bitumen

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