When simulation user want to simulate a distillation column, sometime they only have input stream information but they don’t know how many number of distillation column stages to simulate. User can guess how much number of stages in distillation, but there is a step user can use to find initial number of stages. This tutorial objective is to design simple distillation from beginning.
Fig 1. Modelling distillation tower using Aspen HYSYS.
A. Find Pressure of Column Suppose user has feed information below, Fluid Package : Peng Robinson
Total mass flow = 14634.5 Kg/hr at saturated liquid
Feed then is introduced to separator with same operating condition
Distillation : Basic (Aspen Hysys)
Fig.2 Example of Flash Drum simulation Open bottom stream information.
P = 14.92 , this pressure will be used for next design using shortcut column
Distillation : Basic (Aspen Hysys)
B. Shortcut Distillation After user got pressure from previous simulation, that Pressure information is used to shortcut distillation simulation by using same feed
Fig.3 Shortcut distillation
Make sure, Top Product Phase is Liquid
Distillation : Basic (Aspen Hysys) and then choose parameters. Fill black form of Parameters. For example, Reflux ratio = 2x Reflux minimum
Minimum reflux ratio = 9, External Reflux ratio = 9x2 = 18 , and then, click Performance tab.
Distillation : Basic (Aspen Hysys) Actual number of Trays = 72.7. This is theoretical tray for column. 73 trays is used in the simulati on. Optimal feed stage = 28.6 = stage number 29.
C. Rigorous Distillation On the Palette, choose Distillation Column, fill all information, and then Next
Distillation : Basic (Aspen Hysys)
And then, Next, until last page
Distillation : Basic (Aspen Hysys)
Choose Monitor, Set Specification, Distillation Rate = 10809.5 Kg/hr and Reflux Rate = 194534.5 Kg/hr, and then Run
Feed then is introduced to separator with same operating condition. Page 3 of 9. Basic Distillation - ASPEN HYSYS.pdf. Basic Distillation - ASPEN HYSYS.pdf.
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##Assignment-1. 1. Name one separation process that requires energy input to the system. (a) Coagulation, (b) Adsorption, (c) Distillation, (d) Flocculation. 2.
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associated with the separation of natural gas liquids (NGL). Fast and safe convergence is obtained even near the critical region. Scope-Existing algorithms for solving multistage, multicomponent separation problems can be divided into three main grou
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