Slurry-phase hydrocracking of heavy oil and model reactant: effect of dispersed Mo catalyst

Hui Du,Dong Liu,Yajing Duan,Ming Li,Yuyang Ren

doi:10.1007/s13203-014-0092-8

Hui Du, Dong Liu + Show 3 more

Open Access

https://doi.org/10.1007/s13203-014-0092-8

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Abstract

Thermal hydrocracking and catalytic hydrocracking of heavy oil and model reactant have been carried out to investigate the effect of dispersed Mo catalyst on slurry-phase hydrocracking. The XRD and XPS patterns suggested that the major existence form of dispersed Mo catalyst in slurry-phase hydrocracking was MoS2. Experimental data revealed that the conversion of feedstock oils and model reactant increased with the presence of catalyst, while the yields of light products (gas, naphtha) and heavy products (vacuum residue, coke) decreased, the yields of diesel and vacuum gas oil increased in the meantime. Besides, the yields of aromatic hydrocarbon and naphthenic hydrocarbon in naphtha fraction decreased. Effect parameters R G (the ratio of i-C4H10 yield to n-C4H10 yield) and isoparaffin/n-paraffin ratio were proposed to study the reaction mechanism of slurry-phase hydrocracking, the smaller effect parameters showed that there was no carbonium ion mechanism in slurry-phase hydrocracking, which still followed the free radical mechanism, and that the isomerization ratio of products decreased with the presence of Mo catalyst.

Highlights

The hydroprocessing of residue includes fixed bed, moving bed, ebullated bed and slurry-phase hydroprocessingCatalyst plays a significant role in slurry-phase hydrocracking, a catalyst with high activity will result in high yield of light fuel oil and low yield of coke
A smaller value of effect parameters indicate that the slurry-phase hydrocracking still follows the free radical mechanism, and that the formation of isomerization products is suppressed by the dispersed Mo catalyst
The feedstock oils reacted with the following conditions: initial hydrogen pressure, 8.0 MPa; reaction temperature, 420 °C; reaction time, 1 h; stirring rate, 500 rmp, 300 lgÁg-1 of molybdenum naphthenate and 500 lgÁg-1 of sublimate sulfur only for catalytic hydrocracking reaction

Summary

Introduction

The hydroprocessing of residue includes fixed bed, moving bed, ebullated bed and slurry-phase hydroprocessingCatalyst plays a significant role in slurry-phase hydrocracking, a catalyst with high activity will result in high yield of light fuel oil and low yield of coke. Abstract Thermal hydrocracking and catalytic hydrocracking of heavy oil and model reactant have been carried out to investigate the effect of dispersed Mo catalyst on slurry-phase hydrocracking.

Results

Conclusion