Quantitative relationship between olefin saturation and octane loss during HDS process: An insight from molecular structure to experimental activity

Dong, Liang; Luo, Kaiwei; Zhao, Liang; Zhang, Yuhao; Gao, Jinsen; Hao, Tianzhen; Chen, Xu

doi:10.1016/j.ces.2018.06.060

Cited by 18 publications

(9 citation statements)

References 22 publications

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“…There were three types’ olefins in gasoline: i -olefin, n -olefin, and cyclo-olefin. Many paper pointed that cyclo-olefins had the lowest hydrogenation activity and the lowest effect on octane number loss. ,, The hydrogenation of i -olefins and n -olefins was the hot point in the production of clean gasoline. The branch group was the marker to distinguish i -olefins and n -olefins.…”

Section: Resultsmentioning

confidence: 99%

“…16,17 In addition, the hydrogenation of olefins has a great relationship with its carbon number. 18 The conclusions obtained above were not well applied to the hydrogenation of C7−C9 olefins in FCC gasoline. 5,17,19−21 It is necessary to investigate the effect of carbon number and molecular structure of olefin on its hydrogenation activity.…”

Section: Introductionmentioning

confidence: 91%

“…From here, the hydrogenation of olefins and the main influence factors have been well studied. However, the conclusions obtained in these studies were based on the olefins with small carbon number (such as C5 and C6 olefins) in FCC gasoline or model feed. − The olefins hydrogenated in the HDS unite of FCC gasoline were C7–C9 olefins in the refinery. , In addition, the hydrogenation of olefins has a great relationship with its carbon number . The conclusions obtained above were not well applied to the hydrogenation of C7–C9 olefins in FCC gasoline. ,,− It is necessary to investigate the effect of carbon number and molecular structure of olefin on its hydrogenation activity.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Carbon Number and Molecular Structure of Olefin on HDO Activity and Hydrogenation Pathway

Dong

Zhang

Luo

et al. 2020

Ind. Eng. Chem. Res.

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The hydrogenation of C7–C9 olefins, which leads to severe loss of octane number in the hydrodesulfurization process of gasoline, was investigated. The reactivity of olefins hydrogenation was affected by the branch group, CC bond position, and the distance between them. The steric hindrance caused by the branch group was decreased with the increase of the carbon number. However, the effect of the CC bond position on olefins hydrogenation increased with the increase of carbon number in olefins. Meanwhile, the steric hindrance, caused by the CC bond position, and the distance between the branch group and CC bond position can be reduced by isomerization of the CC bond. Thus, the isomerization of the CC bond as the first step was the main hydrogenation pathway for internal olefins.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Effect of Carbon Number and Molecular Structure of Olefin on HDO Activity and Hydrogenation Pathway

Dong

Zhang

Luo

et al. 2020

Ind. Eng. Chem. Res.

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“…Gasoline products lose about 2–3 units of octane number (ON) because several high-ON olefins in FCC naphtha are saturated to low-ON paraffin by the hydrodesulfurization (HDS) process (the main desulfurization process used worldwide). In addition, the saturation of olefins during HDS consumes a large amount of hydrogen, which is contrary to the principle of efficient resource utilization . On the basis of molecular refining, controlling the saturation of olefins in the HDS process can be used for the separation of olefins from FCC naphtha, rather than improving the catalysts and HDS process.…”

Section: Introductionmentioning

confidence: 99%

Desulfurization of Fluid Catalytic Cracking Naphtha by Extractive Distillation: A Universal Simulation Method Established Using the Universal Quasi-Chemical Functional Group Activity Coefficient Model

et al. 2021

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The extractive distillation process is gradually being used for the desulfurization of fluid catalytic cracking (FCC) naphtha because of its excellent octane number protection performance during desulfurization. The key to this process is the separation of sulfides. However, the composition of FCC naphtha is complicated and easily changes, which seriously affect the separation performance. The operating conditions need to be adjusted frequently with the change in the different properties of feedstocks, which cost time, manpower, and investment. In this study, we introduce a simulation method using the universal quasi-chemical functional group activity coefficient (UNIFAC) model to predict the process of desulfurization. In the simulation, the group binary parameters for the UNIFAC model seriously affect the reliability of the method. Therefore, the lacking parameters of the solvent and sulfides were first regressively calculated by the experimental results of the binary vapor−liquid equilibrium (VLE). All the values of (D−J) by the Herington integral method were under 10, which means that the parameters obtained in this work were well correlated to those of the VLE experiments. Based on this, the prediction simulation method was established and the maximum error of the compositions of the products between simulation and real-oil experiment was only 0.5 wt %. According to the simulation, 98% of sulfides could be extracted under the optimal conditions (113 °C at the extraction column, 178 °C at the solvent recycle column, etc.). The rule of the extraction of sulfides was thiophene sulfur > mercaptan sulfur > thioether sulfur, which is consistent with the VLE study results. The sulfur content of the raffinate oil was decreased to 9.3 mg/kg. It well met the latest gasoline standard and is appropriate for the prediction of the desulfurization of FCC naphtha by the extractive distillation process.

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“…15,19 On the other hand, another effective approach to preserve RON is to convert olefins into isoparaffins that possess higher RON. 3,20 For example, if 1-hexene is hydrogenated to nhexane, the loss of RON reaches 50; while converting olefins to methylpentanes, RON losses are less than 3. Olefin isomerization usually takes place over acidic catalysts, such as zeolites, aluminosilicates, metal−organic frameworks, and phosphoric acid.…”

Section: Introductionmentioning

confidence: 99%

Hydrotreatment of FCC Gasoline Catalyzed by CoMo Bifunctional Catalysts: The Effects of Acidity on Catalytic Performance

Chen

Xia

Zheng

et al. 2020

Ind. Eng. Chem. Res.

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The acidity of bifunctional catalysts is regarded as one of the most important factors for FCC gasoline hydrotreatment. To investigate the effects of acidity on catalytic performance, the CoMo/Al2O3 catalysts modified by MCM-41 and HZSM-5 were prepared by incipient wetness impregnation. The characterization results showed that adding molecular sieves changed the distribution of acid sites of catalysts and had a positive impact on forming longer MoS2 slabs with a slightly higher stacking number related to better hydrodesulfurization (HDS) performance. The results of catalytic performance indicated that 1-octene isomerization conversion increased from 4.13 to 33.97% with the increasing Brønsted acid site/Lewis acid site (BAS/Lewis acid sites (LAS)) ratio by presenting stronger BAS, resulting in the increasing selectivity of hydrodesulfurization/olefin hydrogenation (HDS/HYDO) from 0.89 to 5.41. However, when the BAS/LAS ratio surpassed 0.46 with the presence of weaker and stronger BAS, HDS efficiencies started decreasing. This understanding sheds light on designing hydrotreating catalysts to produce high-quality gasoline.

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Quantitative relationship between olefin saturation and octane loss during HDS process: An insight from molecular structure to experimental activity

Cited by 18 publications

References 22 publications

Effect of Carbon Number and Molecular Structure of Olefin on HDO Activity and Hydrogenation Pathway

Effect of Carbon Number and Molecular Structure of Olefin on HDO Activity and Hydrogenation Pathway

Desulfurization of Fluid Catalytic Cracking Naphtha by Extractive Distillation: A Universal Simulation Method Established Using the Universal Quasi-Chemical Functional Group Activity Coefficient Model

Hydrotreatment of FCC Gasoline Catalyzed by CoMo Bifunctional Catalysts: The Effects of Acidity on Catalytic Performance

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