Simulation and Optimization of Distillation Processes for Separating the Methanol–Chlorobenzene Mixture with Separate Heat-Pump Distillation

The methanol–chlorobenzene mixture has a larger relative volatility in the low composition range than in the high composition range. Based on this characteristic, the mixture can be effectively separated by separate heat-pump distillation (SHPD) with significant energy savings. The binary interaction parameters of the UNIQUAC equation were used to predict the vapor–liquid equilibrium by means of the binary interaction parameters included in the Aspen Plus database. To minimize the overall annual operating costs, simulations for SHPD were carried out using Aspen Plus software, including the RadFrac and Compr blocks, and the optimal operating conditions, such as the split-point concentration, were determined. Simulations for conventional distillation, conventional heat-pump distillation, and multieffect distillation processes were also carried out for comparison. The simulated results showed that the SHPD process has obvious advantages over the other distillation processes in the assessment of energy saving...

[1]  William L. Luyben,et al.  Distillation Design and Control Using AspenTM Simulation: Luyben/Distillation Design and Control Using Aspen Simulation , 2006 .

[2]  Massimiliano Errico,et al.  Energy saving in a crude distillation unit by a preflash implementation , 2009 .

[3]  Paul Langston,et al.  Economic feasibility of heat pumps in distillation to reduce energy use , 2009 .

[4]  Martín Picón-Núñez,et al.  Thermal integration of heat pumping systems in distillation columns , 1999 .

[5]  E. L. Ligero,et al.  Dehydration of ethanol with salt extractive distillation—a comparative analysis between processes with salt recovery , 2003 .

[6]  William L. Luyben,et al.  Design and Control of Distillation Systems for Separating Azeotropes: Luyben/Azeotropes Distillation , 2010 .

[7]  Juan Gabriel Segovia-Hernández,et al.  Design and Optimization of Thermally Coupled Distillation Schemes for the Separation of Multicomponent Mixtures , 2006 .

[8]  Sigurd Skogestad,et al.  Multi-effect distillation applied to an industrial case study , 2005 .

[9]  Sigurd Skogestad,et al.  Selecting appropriate control variables for a heat-integrated distillation system with prefractionator , 2004, Comput. Chem. Eng..

[10]  Yasuki Kansha,et al.  New Design Methodology Based on Self-Heat Recuperation for Production by Azeotropic Distillation , 2010 .

[11]  Z. Fonyó,et al.  Design strategy for heat pump assisted distillation system , 1986 .

[12]  Peter Mizsey,et al.  Rigorous investigation of heat pump assisted distillation , 1995 .

[13]  Xiao Feng,et al.  Optimal Design and Optimal Operation of Separate Heat Pump Distillation , 2008 .

[14]  Eugeny Y. Kenig,et al.  Dividing wall columns in chemical process industry: A review on current activities , 2011 .

[15]  Yasuki Kansha,et al.  Self-Heat Recuperation Technology for Energy Saving in Chemical Processes , 2009 .

[16]  Peter Mizsey,et al.  Economic application of heat pumps in integrated distillation systems , 1994 .