TY - JOUR
T1 - Hydrodesulfurization of 4,6-Dimethyldibenzothiophene on NiMoP/γ-Al2O3catalyst under reactive distillation conditions in a micro trickle bed reactor
T2 - Solvent and temperature effect
AU - García-Martínez, Julio Cesar
AU - Chávez-Esquivel, Gerardo
AU - Colín-Luna, José Antonio
AU - De Los Reyes-Heredia, José Antonio
N1 - Publisher Copyright:
© 2022 Walter de Gruyter GmbH, Berlin/Boston.
PY - 2023/4/1
Y1 - 2023/4/1
N2 - In this work, the influence of pressure and temperature experimentally applied on reactive distillation (RD) under lower conditions than conventional hydrotreating (HDT) processes, the hydrodesulfurization (HDS) reaction of 4,6-dimethyldibenzothiophene (4,6-DMDBT) molecule and the experimental performance of a down-flow micro trickle bed reactor (micro-TBR) with n-dodecane and decalin were studied. Thermodynamic analyses to evaluate hydrogen solubility in liquid hydrocarbons and evaporation for n-dodecane and decalin as lineal and cyclic representative solvents, respectively, were considered. It was possible to define experimental conditions, producing a small deviation of the plug flow model (PFM) and diminished the gas-liquid (G-L) mass transfer limitation as determined from a reactor model at 2.5 MPa. The axial dispersion model (ADM) and PFM models adjust the experimental data at 2.5 MPa operational pressure and the 4,6-DMDBT conversion obtained was ca. 20-50% using n-dodecane; 1.5 times higher when decalin was using. This behavior was due to the liquid hydrogen fraction of n-dodecane was two times higher than for decalin for all operational pressures. In this sense, the use of n-dodecane as a solvent decreased the mass transfer resistance at the G-L and liquid-solid (L-S) interphases. The internal mass transfer resistance in the G-L interphase not only depends on the diffusivity of the solvent, but it also depends on both, the temperature and hydrogen pressure, finding that the RD conditions with n-dodecane are viable in the treatment of sterically impaired molecules in HDS processes.
AB - In this work, the influence of pressure and temperature experimentally applied on reactive distillation (RD) under lower conditions than conventional hydrotreating (HDT) processes, the hydrodesulfurization (HDS) reaction of 4,6-dimethyldibenzothiophene (4,6-DMDBT) molecule and the experimental performance of a down-flow micro trickle bed reactor (micro-TBR) with n-dodecane and decalin were studied. Thermodynamic analyses to evaluate hydrogen solubility in liquid hydrocarbons and evaporation for n-dodecane and decalin as lineal and cyclic representative solvents, respectively, were considered. It was possible to define experimental conditions, producing a small deviation of the plug flow model (PFM) and diminished the gas-liquid (G-L) mass transfer limitation as determined from a reactor model at 2.5 MPa. The axial dispersion model (ADM) and PFM models adjust the experimental data at 2.5 MPa operational pressure and the 4,6-DMDBT conversion obtained was ca. 20-50% using n-dodecane; 1.5 times higher when decalin was using. This behavior was due to the liquid hydrogen fraction of n-dodecane was two times higher than for decalin for all operational pressures. In this sense, the use of n-dodecane as a solvent decreased the mass transfer resistance at the G-L and liquid-solid (L-S) interphases. The internal mass transfer resistance in the G-L interphase not only depends on the diffusivity of the solvent, but it also depends on both, the temperature and hydrogen pressure, finding that the RD conditions with n-dodecane are viable in the treatment of sterically impaired molecules in HDS processes.
KW - 4,6-dimethyldibenzothiophene
KW - hydrodesulfurization
KW - micro trickle bed reactor
KW - reactive distillation
KW - thermodynamic analysis
UR - http://www.scopus.com/inward/record.url?scp=85133427202&partnerID=8YFLogxK
U2 - 10.1515/ijcre-2022-0005
DO - 10.1515/ijcre-2022-0005
M3 - Artículo
AN - SCOPUS:85133427202
SN - 2194-5748
VL - 21
SP - 413
EP - 429
JO - International Journal of Chemical Reactor Engineering
JF - International Journal of Chemical Reactor Engineering
IS - 4
ER -