Two-Stage Hydrotreating of Athabasca Heavy Gas Oil with Interstage Hydrogen Sulfide Removal: Effect of Process Conditions and Kinetic Analyses
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- 作者：Christian Botchwey ; Ajay K. Dalai ; and John Adjaye
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2004
- 出版时间：September 1, 2004
- 年：2004
- 卷：43
- 期：18
- 页码：5854 - 5861
- 全文大小：179K
- 年卷期：v.43,no.18(September 1, 2004)
- ISSN：1520-5045
文摘
Two-stage hydrodenitrogenation (HDN)-hydrodesulfurization (HDS) of heavy gas oil, derivedfrom Athabasca bitumen, has been carried out in a trickle-bed microreactor using a commercialNiMo/Al2O3 catalyst. The operating conditions for the experiments were varied as follows:temperature range of 340-420 
C, reactor pressure of 950-1600 psig, liquid hourly space velocityrange of 0.5-2.0 h-1, and hydrogen to heavy gas oil ratio of 600 mL/mL. Variation in the catalystloading between stages I and II was also studied. Stage I products were stripped off any generatedhydrogen sulfide and further hydrotreated in stage II to see the impact of hydrogen sulfideinterstage removal on the hydrotreating activities. A comparison of the two-stage results tothose of the single-stage results shows an enhancement in the hydrotreating activities. Forinstance, a 12.6 wt % increase in the conversion of nonbasic nitrogen was observed. The optimumconditions for higher gain in HDN and HDS due to hydrogen sulfide removal were found to be380 C, 7.6 MPa, and 1:3 (w/w) catalyst loading. A Langmuir-Hinshelwood model developedfor the hydrogen sulfide inhibition predicts sufficiently the observed data of the two-stage process.
C, reactor pressure of 950-1600 psig, liquid hourly space velocityrange of 0.5-2.0 h-1, and hydrogen to heavy gas oil ratio of 600 mL/mL. Variation in the catalystloading between stages I and II was also studied. Stage I products were stripped off any generatedhydrogen sulfide and further hydrotreated in stage II to see the impact of hydrogen sulfideinterstage removal on the hydrotreating activities. A comparison of the two-stage results tothose of the single-stage results shows an enhancement in the hydrotreating activities. Forinstance, a 12.6 wt % increase in the conversion of nonbasic nitrogen was observed. The optimumconditions for higher gain in HDN and HDS due to hydrogen sulfide removal were found to be380 C, 7.6 MPa, and 1:3 (w/w) catalyst loading. A Langmuir-Hinshelwood model developedfor the hydrogen sulfide inhibition predicts sufficiently the observed data of the two-stage process.