Hydrofining and Catalytic Cracking of Coker Gas Oil

Meng, Xianghai; Chen, Xu; Gao, Jinsen

doi:10.1080/10916460701707430

Cited by 9 publications

(15 citation statements)

References 7 publications

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“…Coker gas oil (CGO), a main intermediate product of delayed coking, usually accounts for 20-30 wt% of the total feedstock (Meng et al, 2009), therefore its utilization is of great importance. However, CGO has been considered difficult to process for decades due to its characteristic high aromatics and nitrogen content (Hou et al, 2007;.…”

Section: Introductionmentioning

confidence: 99%

Application of Coker Gas Oil Used as Industrial Hydrogen Donors in Visbreaking

Chen

Yong-liang

Wang

et al. 2014

Petroleum Science and Technology

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Effectiveness of coker gas oil (CGO) used as industrial hydrogen donors in the visbreaking was revealed. Hydrogen-transferring abilities of different CGO narrow fractions were first analyzed. The fraction of 350-420 • C (HDII) turned out to be the best selection as hydrogen donors and then we did visbreaking experimental tests. The results show that, in contrast with conventional visbreaking, the addition of HDII achieves higher conversion of residues to desirable liquid product and effectively suppresses coke formation: the coke induction period is prolonged from 17 to 27 min and the liquid-coke particle size decreases from 0.307 to 0.186 μm. The hydrogen shuttle between asphaltene and hydrogen donors is of great significance during this thermal processing.

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Section: Introductionmentioning

confidence: 99%

Application of Coker Gas Oil Used as Industrial Hydrogen Donors in Visbreaking

Chen

Yong-liang

Wang

et al. 2014

Petroleum Science and Technology

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“…Inferior heavy oil is becoming an important component of the energy platform, and its use as a source for liquid fuel is growing . Coking is the most common process for converting inferior heavy oil. , Coker gas oil (CGO), which accounts for 20–30 wt % of the coker feed, is hard to process by fluid catalytic cracking (FCC) and hydrocracking (HDC) as a result of its high content of nitrogen compounds and condensed aromatics. , Total nitrogen compounds refer to the basic (can be titrated by perchloric acid in glacial acetic acid) and non-basic nitrogen compounds. The acidic sites of the FCC and HDC catalysts are readily neutralized by the basic nitrogen compounds. − Non-basic nitrogen compounds and condensed aromatics, on the other hand, easily adsorb onto the catalyst active sites, where they undergo dehydrogenation and condensation reactions to form coke.…”

Section: Introductionmentioning

confidence: 99%

“…Accordingly, pretreating ICGO before FCC processing is inevitable. Solid adsorbents, neutralization, solvent extraction, − and hydrotreatment (HDT) , are the most used pretreatment methods for processing ICGO. The first three led to a low liquid yield, high energy consumption, and serious environmental problems, whereas HDT was deemed feasible.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the quality of the Athabasca-derived feedstock is still superior to that of the ICGO derived from the Venezuelan vacuum residue. Very few studies in fact considered ICGO HDT followed by FCC processing. , …”

Section: Introductionmentioning

confidence: 99%

“…1 Coking is the most common process for converting inferior heavy oil. 2,3 Coker gas oil (CGO), which accounts for 20−30 wt % of the coker feed, 4 is hard to process by fluid catalytic cracking (FCC) and hydrocracking (HDC) as a result of its high content of nitrogen compounds and condensed aromatics. 5,6 Total nitrogen compounds refer to the basic (can be titrated by perchloric acid in glacial acetic acid) and nonbasic nitrogen compounds.…”

Section: Introductionmentioning

confidence: 99%

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Combined Hydrotreating and Fluid Catalytic Cracking Processing for the Conversion of Inferior Coker Gas Oil: Effect on Nitrogen Compounds and Condensed Aromatics

Shen¹,

Wang²,

Liu³

et al. 2018

Energy Fuels

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Inferior coker gas oil (ICGO) derived from Venezuelan vacuum residue delayed coking is difficult to process using fluid catalytic cracking (FCC) or hydrocracking (HDC). The high content of nitrogen and condensed aromatics leads to major coking and readily deactivates the acid catalyst. In this work, a sequence of hydrotreating (HDT) and FCC processing is used to effectively convert ICGO to a high-value light oil product. The results show a higher overall conversion and a significant increase in the yield of gasoline compared to FCC processing. Molecular level characterization of the nitrogen compounds and condensed aromatics before and after HDT confirms that the nitrogen content and the 2+-ring aromatic content decreased, whereas the single-ring aromatics increased. The nitrogen compounds were mainly N1, N1O1, N1O2, and N1S1 class species in basic nitrogen and N1, N1O1, N1O2, N2, and N2O1 class species in non-basic nitrogen. Moreover, the double bond equivalent of these species shifted to lower values. The decrease in the nitrogen compounds with a high heteroatom content reduces coking on the FCC catalyst. Subsequently, FCC unit performance and conversion to light oil increased. Moreover, the decrease in the size of N1 class compounds and the ease of their cracking following HDT improved the performance of the FCC unit. Partial saturation of condensed aromatics following HDT also made it easier to crack these compounds.

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