Hydroconversion kinetics of Marlim vacuum residue

Almeida, Rafael Menegassi de; Guirardello, Reginaldo

doi:10.1016/j.cattod.2005.08.021

Cited by 25 publications

(34 citation statements)

References 16 publications

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“…Almeida et al [17] presented a 5-lump kinetic model for hydroconversion of Marlim vacuum residue in which by utilizing fourteen experiments in batch reactor, 26 coefficients were estimated for the kinetic model.…”

Section: Introductionmentioning

confidence: 99%

“…This work confirmed the validity of lumping strategy even for the hydrotreating process. The usage of lumping strategy is not limited to hydrocracking and some works have been done in the similar fields like modeling of fluid catalytic cracking process [19], hydroconversion [20] and catalytic [21,22] as well as thermal cracking [23] of heavy oils which the latter is in the field of petrochemical processes.…”

Section: Introductionmentioning

confidence: 99%

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4-Lump kinetic model for vacuum gas oil hydrocracker involving hydrogen consumption

Sadighi

Ahmad

Rashidzadeh³

2010

Korean J. Chem. Eng.

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A 4-lump kinetic model including hydrogen consumption for hydrocracking of vacuum gas oil in a pilot scale reactor is proposed. The advantage of this work over the previous ones is consideration of hydrogen consumption, imposed by converting vacuum gas oil to light products, which is implemented in the kinetic model by a quadratic expression as similar as response surface modeling. This approach considers vacuum gas oil (VGO) and unconverted oil as one lump whilst others are distillate, naphtha and gas. The pilot reactor bed is divided into hydrotreating and hydrocracking sections which are loaded with different types of catalysts. The aim of this paper is modeling the hydrocracking section, but the effect of hydrotreating is considered on the boundary condition of the hydrocracking part. The hydrocracking bed is considered as a plug flow reactor and it is modeled by the cellular network approach. Initially, a kinetic network with twelve coefficients and six paths is considered. But following evaluation using measured data and order of magnitude analysis, the three route passes and one activation energy coefficient are omitted; thus the number of coefficients is reduced to five. This approach improves the average absolute deviation of prediction from 7.2% to 5.92%. Furthermore, the model can predict the hydrogen consumption for hydrocracking with average absolute deviation about 8.59% in comparison to those calculated from experimental data.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

4-Lump kinetic model for vacuum gas oil hydrocracker involving hydrogen consumption

Sadighi

Ahmad

Rashidzadeh³

2010

Korean J. Chem. Eng.

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“…In Eqs. (9) to (15), ρ and μ are the density and viscosity of stream at hydrocracking pressure and temperature, respectively. These transport parameters can be calculated as follows [31]:…”

Section: Model Formulationmentioning

confidence: 99%

“…Because of low Reynolds number of the stream (9<Re p <25), molecular diffusion is important. Therefore, the mass transport equation for lumps can be expressed as follows: (15) where j ranges from the fresh feed (F) to gas (G); C denotes the mass concentration of lumps; η is the effectiveness factor which is equal to 0.7 for a cylindrical catalyst in a trickle bed regime [29]; the positive sign "+" stands for reactant (feed or VGO); the negative sign "−" relates to products, and D j is the dispersion of lumps in the VGO feed whilst the self-diffusion and diffusion of gas in VGO are neglected. Therefore, D FF and D GF are equal to zero.…”

Section: Model Formulationmentioning

confidence: 99%

“…According to the discrete lumping approach, there are many researches in which the hydrocracking process is modeled with threelump [11,12], four-lump [13,14], five-lump [15], six-lump [16] and eight-lump [17] partitions. In all these studies, the pilot or industrial scale reactor was modeled using a one-dimensional (1D) space in which hydrocracking and/or hydrotreating reactions were assumed to be carried out in the axial direction.…”

Section: Introductionmentioning

confidence: 99%

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A two-dimensional discrete lumped model for a trickle-bed vacuum gas oil hydrocracking reactor

Sadighi¹

2016

Korean J. Chem. Eng.

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A two-dimensional (2D) computational fluid dynamics model based on discrete lumping approach was used to predict the product yields of a pilot scale vacuum gas oil (VGO) hydrocracking reactor. This model was developed by solving mass conservation equations in conjunction with the continuity and momentum balances in the z-r cylindrical plane. The kinetic parameters of the model were estimated from the experimental data, and validated by using actual values. Results show that the proposed model can appreciably improve the accuracy of the yield prediction in comparison to the predicted value using the 1D model. Moreover, it is confirmed that the order of magnitude of the radial liquid velocity against the axial one is considerably low, and there is no significant pressure drop along the r-direction. Additionally, results show that two-dimensional model is a reliable tool for evaluating the catalyst performance and also for designing commercial reactors.

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