Composition and Properties of Chinese Coker Gas Oil

Cao, Zhilong; Hou, B.; Chen, W.; Zhao, Qin

doi:10.1080/10916460500411879

Cited by 6 publications

(6 citation statements)

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“…Elemental composition of CGOs were listed in Table . Other properties of these types of CGOs have been reported elsewhere. ,,, …”

Section: Methodsmentioning

confidence: 87%

“…Coker gas oil (CGO), the vacuum distillate fraction of coking product, accounts for 20−30 wt % yield in thermal conversion of heavy feedstock . CGO can be used either as blending stock for fuel oil or feedstock for catalytic cracking and hydrocracking. , However, CGO contains high concentrations of basic nitrogen compounds, − which cause rapid catalyst deactivation in downstream catalytic processes. Hence, more comprehensive and detailed characterization of the composition of basic nitrogen compounds present in CGO can be useful in the designing and developing of better catalysts for processing heavy feedstock.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Basic Nitrogen Species in Coker Gas Oils by Positive-Ion Electrospray Ionization Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

Shi¹,

Xu²,

Zhao³

et al. 2010

Energy Fuels

119

129

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Six coker gas oils (CGOs) and three basic fractions extracted from one of the CGOs by 0.1, 0.4, and 1 M HCl hydrochloric acid were characterized by positive-ion electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI FT-ICR MS) and compared to those analyzed by gas chromatography mass spectrometry (GC-MS). The ultra high mass resolving power and high mass accuracy of FT-ICR MS allow the assignment of a unique elemental composition to each peak in the mass spectrum. Basic nitrogen species were characterized by class, type, and carbon number. The mass spectra of the CGOs at the 200-500 Da mass range were similar, but the distribution of double bond equivalence (DBE) versus carbon number were different. Among the N, N 2 , NO, and NS that were identified in CGOs, the N class nitrogen species were dominant. The results showed that hydrotreating reduced the relative abundance of all class species, except for the N class species. This suggests that some N class species are refractory to hydrotreating. The molecular weight of nitrogen species in the acid-extracted basic nitrogen fraction of CGO was lower than that of its parent CGO. The N 3 , NO 2 , and N 2 O class species were clearly identified and concentrated in the basic nitrogen fraction, but were not detected in their parent CGO. The N class species with ring plus DBE value of 4-16 in the basic nitrogen fraction were also identified by GC-MS analysis.

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“…Elemental composition of CGOs were listed in Table . Other properties of these types of CGOs have been reported elsewhere. ,,, …”

Section: Methodsmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Characterization of Basic Nitrogen Species in Coker Gas Oils by Positive-Ion Electrospray Ionization Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

Shi¹,

Xu²,

Zhao³

et al. 2010

Energy Fuels

119

129

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“…The properties of ICGO derived from the Venezuelan Mery-16 crude oil vacuum residue delayed coking unit are listed in Table . The properties of coker heavy gas oil (CHGO) derived from Athabasca bitumen (A-CHGO) and five kinds of CGOs from China, namely, Daqing coker gas oil (DQ-CGO), , Changling coker gas oil (CL-CGO), Dagang coker gas oil (DG-CGO), Shengli coker gas oil (SL-CGO), and LH-CGO, are also included in Table . Table shows that DQ-CGO and CL-CGO portray lower total nitrogen and aromatic contents, which entails no major processing challenges.…”

Section: Methodsmentioning

confidence: 99%

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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“…In general, hydrotreatment and hydrocracking are employed to upgrade CGO, but these processes involve high capital and operating costs. − An economical and feasible alternative to upgrade CGO is to use it in direct fluid catalytic cracking (FCC) feedstock or as part of FCC feedstocks. − In China, the lack of hydrocracking and hydrotreatment resources has led many refineries to use of FCC units to convert CGO. However, large amounts of basic nitrogen compounds in CGO neutralize and temporarily deactivate acid sites of catalysts, − thereby decreasing feed conversion and product yields and causing low levels of blended CGO/FCC feedstock ratios.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Process for Coker Gas Oil and Heavy Cycle Oil Conversion for Maximum Light Production

Wang¹,

Li²,

Huang³

et al. 2010

Ind. Eng. Chem. Res.

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Coker gas oil (CGO), heavy cycle oil (HCO), and a CGO-HCO blend were treated by solvent refinement and then cracked in a FCC pilot plant over a commercial Y zeolite-based catalyst at selected reaction conditions. The experimental setup simulates the cracking behavior of different feed streams in an FCC unit using different processing schemes. The processing alternative that can yield the highest conversion and maximum light oil production was evaluated. Blending unrefined CGO into FCC feedstock results in decreased feed conversion and retarded desirable product yields. This is attributed to the large amount of basic nitrogen compounds and polycyclic aromatics found in unrefined CGO. Solvent refinement of CGO, however, produced significant improvements in product yield, denitrification and contaminant-removal rates, and product quality. The same observations are true for feedstocks blended individually with refined HCO and a refined mixture of CGO and HCO. Refined oils are also superior to RFCC feedstocks for their improved feed conversion, product yield and product quality.

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Composition and Properties of Chinese Coker Gas Oil

Cited by 6 publications

References 0 publications

Characterization of Basic Nitrogen Species in Coker Gas Oils by Positive-Ion Electrospray Ionization Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

Characterization of Basic Nitrogen Species in Coker Gas Oils by Positive-Ion Electrospray Ionization Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

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

Synergistic Process for Coker Gas Oil and Heavy Cycle Oil Conversion for Maximum Light Production

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