Multiobjective optimization of a hydrodesulfurization process of diesel using distillation with side reactor

xico ABSTRACT: The distillation with side reactor has been proposed to remove sulfur compounds of diesel. The design and optimization of a hydrodesulfurization process involve the selection of the configuration and the operating conditions to minimize the total annual cost, CO2 emissions, and the amount of sulfur compounds. In general, the optimal design of a hydrodesulfurization process is a nonlinear and multivariable multiobjective optimization problem, with the presence of both continuous and discrete design variables. In particular, stochastic multiobjective optimization algorithms are capable of solving, robustly and efficiently, challenging optimization problems, and they appear to be a suitable alternative for the design and optimization of complex process schemes. In this study, we have performed the multiobjective optimization of five configurations of distillation with a side reactor for the hydrodesulfurization process including an alternative using reactive distillation. The multiobjective optimization problem can be stated as a minimization of total annual cost (TAC), CO2 emissions, and amount of sulfur compounds. The results obtained in the Pareto fronts indicated competition between total annual cost, CO2 emissions, and the amount of sulfur compounds of the hydrodesulfurization process. These Pareto solutions are useful to identify proper conditions for the operation of this process. In general, the reduction of the amount of sulfur compounds increases the TAC and CO2 emissions. However, we can identify operating conditions where the TAC can be reduced.

[1]  Moses O. Tadé,et al.  Application of side reactors on ETBE reactive distillation , 2004 .

[2]  K. Joback,et al.  ESTIMATION OF PURE-COMPONENT PROPERTIES FROM GROUP-CONTRIBUTIONS , 1987 .

[3]  Rajamani Krishna,et al.  Modelling reactive distillation , 2000 .

[4]  G. Froment,et al.  Kinetics of hydrodesulfurization on a cobalt-molybdenum/.gamma.-alumina catalyst. 1. Kinetics of the hydrogenolysis of thiophene , 1986 .

[5]  Syed A. Ali,et al.  Deep desulfurization of gas oil over NiMo catalysts supported on alumina–zirconia composites , 2012 .

[6]  Rajamani Krishna,et al.  Distillation column with reactive pump arounds: an alternative to reactive distillation , 2004 .

[7]  Robin Smith,et al.  Reducing CO2 emissions and energy consumption of heat-integrated distillation systems. , 2005, Environmental science & technology.

[8]  Richard Turton,et al.  Analysis, Synthesis and Design of Chemical Processes , 2002 .

[9]  T. Ho,et al.  Kinetics of dibenzothiophene hydrodesulfurization , 1991 .

[10]  K. Sakanishi,et al.  Hydrodesulfurization Reactivities of Narrow-Cut Fractions in a Gas Oil , 1995 .

[11]  A. Sapre,et al.  Hydrodesulfurization of methyl-substituted dibenzothiophenes catalyzed by Co-Mo/gamma-Al2O3 , 1980 .

[12]  Isao Mochida,et al.  Hydrodesulfurization reactivities of various sulfur compounds in diesel fuel , 1994 .

[13]  K. Sakanishi,et al.  Three-stage Deep Hydrodesulfurization of Diesel Fuel under 30kg/cm2 H2 Pressure without Color Development , 1993 .

[14]  Eduardo S. Pérez-Cisneros,et al.  Conceptual design of a reactive distillation process for ultra-low sulfur diesel production , 2005 .

[15]  Gilbert F. Froment,et al.  Kinetic Modeling and Reactor Simulation in Hydrodesulfurization of Oil Fractions , 1994 .

[16]  Gilbert F. Froment,et al.  Hydrodesulfurization of 4-Methyldibenzothiophene and 4,6-Dimethyldibenzothiophene on a CoMo/Al2O3 Catalyst: Reaction Network and Kinetics , 1998 .

[17]  K. Knudsen,et al.  Catalyst and process technologies for ultra low sulfur diesel , 1999 .

[18]  G. P. Rangaiah,et al.  Multi-objective optimization of a bio-diesel production process , 2013 .

[19]  Freek Kapteijn,et al.  A numerical comparison of alternative three-phase reactors with a conventional trickle bed reactor. The advantages of countercurrent flow for hydrodesulfurization , 1999 .

[20]  J. Ancheyta,et al.  Comparison of kinetic and reactor models to simulate a trickle-bed bench-scale reactor for hydrodesulfurization of VGO , 2012 .