The impact of cut point on the processability of Athabasca bitumen

Rahimi, Parviz; Gentzis, Thomas; Taylor, Ed; Carson, Dan; Nowlan, Vincent J.; Cotte, E.

doi:10.1016/s0016-2361(00)00179-4

Cited by 15 publications

(9 citation statements)

References 10 publications

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“…A high content of asphaltene in the feed has a tendency to give a high coke yield, and several investigators have reported a linear correlation between coke yield and asphaltene content. ,, However, our results show that an increase in the asphaltene concentration in the fractions from 0 (neat maltene), to 9.3 wt % produced an increase in coke yield of only 3.2 wt % (from 2.3 wt % to 5.5 wt %); i.e., only one-third of the asphaltene was converted to coke (see Figure ). In the fractions soluble in Heptol with 20% toluene, the coke yield increased significantly, from 5.5 to 10.4 wt %, although the asphaltene content increased by only 3.3 wt %.…”

Section: Resultscontrasting

confidence: 70%

Characterization of Asphaltenes from Brazilian Vacuum Residue Using Heptane−Toluene Mixtures

et al. 2004

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Brazilian vacuum residue (VR) was separated into insoluble and soluble fractions using n-heptane−toluene mixtures (Heptol). Coking tests performed on the soluble fractions showed that asphaltenes vary in regard to the extent to which they form coke. VR asphaltenes were subfractioned into AS 0−10%, AS 10−20%, AS 20−30%, and AS 30−40% by stepwise extraction using Heptol. The AS 20−30% and AS 30−40% fractions had greater aromaticity and a higher proportion of quaternary aromatic carbons, as well as a larger unit size. These type II asphaltenes produced more coke than did type I asphaltenes, which consist of the AS 0−10% and AS 10−20% fractions.

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Section: Resultscontrasting

confidence: 70%

Characterization of Asphaltenes from Brazilian Vacuum Residue Using Heptane−Toluene Mixtures

et al. 2004

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“…17 Moreover, the bitumen residue percentage is very high (about 51% for Athabasca bitumen) in unconventional bitumen resources, which must be converted to high-value products. 18 Processing of these resources requires high hydrogen consumption to improve the quality as well as hydrogen/carbon atomic ratio enhancement of produced liquids. Consequently, the high loss of liquid oil resulted because most of this liquid will be lost as gas and/or solid, which is not favorable in terms of the process economy.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, there exists a high level of contaminants in the bitumen matrix, such as sulfur, nitrogen, and metal, which also has environmental repercussions and requires special removal techniques . Moreover, the bitumen residue percentage is very high (about 51% for Athabasca bitumen) in unconventional bitumen resources, which must be converted to high-value products . Processing of these resources requires high hydrogen consumption to improve the quality as well as hydrogen/carbon atomic ratio enhancement of produced liquids.…”

Section: Introductionmentioning

confidence: 99%

In Situ Upgrading of Athabasca Bitumen Using Multimetallic Ultradispersed Nanocatalysts in an Oil Sands Packed-Bed Column: Part 1. Produced Liquid Quality Enhancement

2013

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Conventional crude oil production is declining, while the consumption of petroleum-based fuels is increasing. Therefore, bitumen and heavy oil exploitation is steadily growing. However, in the present context, heavy oil and bitumen exploitation processes are high-energy and water-intensive and, consequently, have significant environmental footprints because of the production of gaseous emissions, such as CO 2 , and generating huge amounts of produced water. In situ catalytic conversion or upgrading is a promising cost-effective and environmentally friendly technology that aims at reducing the environmental footprints of oil sand exploitation and producing of high-quality oil that meets pipeline and refinery specifications. In this study, in situ prepared Ni−W−Mo ultradisperse nanocatalysts within a vacuum gas oil matrix were used for Athabasca bitumen upgrading in a packed-bed flow reactor at a high pressure and temperature. Experiments were performed at a pressure of 3.5 MPa, temperatures from 320 to 340 °C, and a hydrogen flow rate of 1 cm 3 /min. The produced liquid was analyzed on the basis of residue conversion, microcarbon residue (MCR) content, sulfur and nitrogen contents, American Petroleum Institute (API) gravity, and viscosity. Results showed that nanocatalysts enhanced the quality of Athabasca bitumen by increasing the API gravity and decreasing the viscosity and MCR, sulfur, and nitrogen contents. Nanocatalysts effectively favored the hydrogenation reactions and inhibited the massive formation of coke that usually occurs via olefin polymerization and heavy free radical condensation during the classical thermal cracking process of heavy oils.

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“…Elliot 19 pointed out deep distillation can reduce total coke yield for deep distillation residue. Rahimi et al 20 studied the reactivity of Athabasca bitumen resid fractions and found the coke yield based on residue increases with boiling point. However, as the cut boiling point increased, the amount of the residue decreased.…”

Section: ■ Introductionmentioning

confidence: 99%

Coking Reactivity of Laboratory-Scale Unit for Two Heavy Petroleum and Their Supercritical Fluid Extraction Subfractions

Zhang

Han

et al. 2013

Ind. Eng. Chem. Res.

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The building of a separation-reaction network for heavy feedstock requires an understanding of the reactivity for subfractions. This paper proposes a study on the coking reactivity for two heavy petroleum samples, vacuum residua (VR) from China Liaohe and Venezuela Orinoco crude oils, and their supercritical fluid extraction fractionation (SFEF) subfractions. The properties of feedstocks and their SFEF series were analyzed, including density, molecular weight, elemental content, Conradson carbon residue (CCR), SARA components (saturates, aromatics, resins and asphaltenes) and structure parameters by nuclear magnetic resonance (NMR). All the samples were subjected to a laboratory-scale batch reactor to investigate the coking reactivity. Coke yield increased as the SFEF subfraction became heavier; while the yields of naphtha, diesel, and gas oil all decreased. The results show that the classic linear correlation between coke yield and CCR are not appropriate for separated fractions of VR. Instead, a negative power function was observed. Furthermore, the coke yield shows a linear relationship with aromaticity for both SFEF series. To precisely estimate coking reactivity for feedstocks and subfractions, a new SARA component based prediction model was carried out, which reveals the contribution of each component.

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The impact of cut point on the processability of Athabasca bitumen

Cited by 15 publications

References 10 publications

Characterization of Asphaltenes from Brazilian Vacuum Residue Using Heptane−Toluene Mixtures

Characterization of Asphaltenes from Brazilian Vacuum Residue Using Heptane−Toluene Mixtures

In Situ Upgrading of Athabasca Bitumen Using Multimetallic Ultradispersed Nanocatalysts in an Oil Sands Packed-Bed Column: Part 1. Produced Liquid Quality Enhancement

Coking Reactivity of Laboratory-Scale Unit for Two Heavy Petroleum and Their Supercritical Fluid Extraction Subfractions

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