| In recent years, great progress has been made in application of Higee distillation;therefore much higher demanding of Higee distillation process simulation accuracy is beingrequired. In this work, a two-phase non-equilibrium mathematical model of higee distillationhas been developed base on transport process models of high gravity filed by modifying themass transfer coefficient correlations and interfacial area correlation of distillation model ingravity filed.Mass transfer coefficient subroutine and interfacial area subroutine of high gravity filedwere programmed by Fortran language. The dynamic link library files of subroutines wereintroduced into Aspen Plus to account for the modification on the mass transfer model andinterfacial area model of an rated-based unit. So, the rated-based unit in Aspen Plus could beused for modeling and simulating the higee distillation process of methanol and water. Moreaccurate mass transfer coefficient correlations and interfacial area correlation were chosenand model reliability of higee distillation were demonstrated by analyzing simulation resultsof the Chen’s and Reddy’s mass transfer coefficient correlations, and Rajan’s and Onda’sinterfacial area correlations. The simulation results show that the mass transfer rate could beelevated one order of magnitude.In this work, the Higee distillation process of simulation and optimization of methanoland water was carried out on the basis of the established two-phase non-equilibrium model ofHigee distillation process on Aspen Plus platform, and analyzed the effective of design andoperation parameters such as feed stage, reflux ratio, rotational speed, volume flow rate offeed, fraction of mass in feed to the whole system substantially. Moreover according to thesensitivity analysis of Aspen Plus, the optimal conditions could be found. The feed stage of13, reflux ratio of1.6, rotational speed of900rpm, volume flow rate of feed of30L/h, fraction of mass in feed of25%are the optimal conditions. |
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