Properties and Chemical Composition of Typical Coker Gas Oil

Hou, B.; Cao, Zhilong; Chen, W.; Han, Jiajing

doi:10.1080/10916460600688897

Cited by 13 publications

(11 citation statements)

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“…The FCC and hydrocracking, which are two key processes for CGO upgrading, face new challenges as a consequence of the increasing heavy-oriented petroleum reserves and severity in the environmental requirements for fuel composition. , To pursue the best interest for refineries, CGO is usually blended with other feedstock during upgrading. The industrial data showed that the maximum blending ratio of CGO is limited to around 20 wt % in the FCC unit, and it is also no more than 20 wt % for hydrocracking to ensure the properties of products and the normal operation and economic benefit of units. − Therefore, the traditional upgrading route that heavy oil was considered as a whole part should be changed to avoid the negative effects caused by retarding parts in heavy oil during processing, and the resources cutting utilization will be realized.…”

Section: Introductionmentioning

confidence: 99%

Effect of Retarding Components on Heavy Oil Catalytic Cracking and Their Corresponding Countermeasures

Wang

Gao

2019

Energy Fuels

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Heavy oil could be classified into two parts: one is the easy cracking part, which is the main source of liquid hydrocarbon transportation fuels and industrial chemicals, and the other is the refractory cracking part, which is failed to be cracked by the present technologies and has negative effects on upgrading. Therefore, the efficient method to obtain a higher conversion of heavy oil is needed for the heavy oil processing industry. Coker gas oil (CGO), used as an example of heavy oil, is supposed to be hard to process during fluid catalytic cracking (FCC). The structural information in the molecular level of basic nitrogen compounds, nonbasic nitrogen compounds, and condensed aromatics in feedstock and liquid products from FCC was investigated. The coked catalysts in the catalytic cracking reaction of CGO were characterized. The results showed that these compounds, especially basic ones, are more difficult to crack, which are preferentially chemisorbed on the surface of the catalyst leading to less acid sites for other easy cracking hydrocarbons and the decrease of the activity of catalysts. Physical solvent removal and chemical catalytic adsorption were used to pretreat heavy oil, and the result indicated that either physical solvent removal or chemical catalytic adsorption is a good way to avoid the retarding effects of refractory cracking components, and better product distributions can be obtained.

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Section: Introductionmentioning

confidence: 99%

Effect of Retarding Components on Heavy Oil Catalytic Cracking and Their Corresponding Countermeasures

Wang

Gao

2019

Energy Fuels

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“…However, when the FCC unit is blended with a certain amount (generally less than 20 wt%) of CGO, the activity and selectivity of catalyst decrease, the feedstock conversion drops, recycle oil and slurry oil withdrawal increase, the yield of coke increases, product distribution deteriorates, and CGO bending ratio becomes strictly limited [ 1 – 3 ]. Earlier works [ 4 , 5 ] on this subject concluded that nitrogen compounds in CGO, especially basic nitrogen compounds, could heavily deactivate FCC catalysts. The poisonous basic nitrogen compounds could reversibly adsorb onto the acid site of catalyst, resulting in a diminution of acid centers, or acted as coke precursors due to their size and aromatic nature [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Characterization of nitrogen compounds in coker gas oil by electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry and Fourier transform infrared spectroscopy

et al. 2014

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In this study, the classes and structures of nitrogen species in coker gas oil (CGO) are characterized by electrospray ionization (ESI) Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) combined with Fourier transform infrared (FT-IR) spectroscopy. The results demonstrate that the m/z of basic and non-basic nitrogen compounds ranges from 180 to 560 and from 200 to 460, respectively. Six basic nitrogen compounds, N1 (a molecule contains one nitrogen atom, similarly hereinafter), N1O1, N1O1S1, N1O2, N1S1, and N2, are identified by their positive-ion mass spectra, and four non-basic nitrogen compounds, N1, N1O1, N1S1, and N2, are characterized by their negative-ion mass spectra. Among these nitrogen compounds, the N1 class species are the most predominant. Combined with the data of ESI FT-ICR MS and FT-IR, the basic N1 class species are likely pyridines, naphthenic pyridines, quinolines, and benzoquinolines. The most non-basic N1 class species are derivatives of benzocarbazole. The N2 class species are likely amphoteric molecules with pyridine and pyrrole core structures.

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“…Therefore, the nitrogen content of the feedstock must be lower than the bearing limit of the catalytic cracking units (basic nitrogen content ≤ 1000 ppm, total nitrogen content ≤ 3000 ppm); the lower the value, the better would be the performance. 16 As shown in Fig. 1 , the total nitrogen content and basic nitrogen content of heavy oil are about 3100 and 1000 ppm, respectively, after the coking process, approaching the permissible limit.…”

Section: Resultsmentioning

confidence: 88%

A kinetic model for in situ coking denitrification of heavy oil with high nitrogen content based on starch using a structure-oriented lumping method

Zhou

et al. 2018

RSC Adv.

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In this study, in situ coking denitrification technology was utilized to simplify the entire process by adding an appropriate quantity of denitrification agents to the delayed-coking tower without any further follow-up denitrification process. The effect of starch as the denitrification agent in the in situ coking denitrification process was studied. The distribution of oil products was characterized by GC of simulated distillation. The results indicated that the nitrogen compounds present in heavy oil transformed to coke via in situ coking conversion by reacting with starch. A molecular-level process model for the coking process was developed.Product distribution on the complex reaction network could be described accurately by the model.

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Properties and Chemical Composition of Typical Coker Gas Oil

Cited by 13 publications

References 0 publications

Effect of Retarding Components on Heavy Oil Catalytic Cracking and Their Corresponding Countermeasures

Effect of Retarding Components on Heavy Oil Catalytic Cracking and Their Corresponding Countermeasures

Characterization of nitrogen compounds in coker gas oil by electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry and Fourier transform infrared spectroscopy

A kinetic model for in situ coking denitrification of heavy oil with high nitrogen content based on starch using a structure-oriented lumping method

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