Assignment on Multicomponent distillation project

Introduction of Multicomponent distillation project

In the chemical mixture, different thermodynamic properties are often dependent on the state properties including pressure, temperature, and saturation conditions (V/F). Considering the properties of two states when third one is fixed by the thermodynamic equilibrium. The prime concern of the project is to measure the multicomponent hydrocarbon system at the fixed feed temperature and with the variation in the operating pressure that can be used to explore the impact of design and operation of distillation column  (Maples, 2000).

Purpose of Multicomponent distillation project

The purpose of the present project is to introduce a multicomponent distillation column design setup with the help of AspenPlus simulation software. Different conditions are considered for the operation and use of simulation results and calculated data to find different aspects of operating systems and pressure on the column design as well as performance.

Data analytics of Multicomponent distillation project

The column specification calculations are carried out for 99.9% recovery of propylene (LK) and 99.9% recovery of n-butane (HK) in the bottoms. The mass balance and constraint elementary process is based on working of pump, reactor, absorber, and distillation column. Pure propylene is feed into the absorber E, then component F will reduce vapor feed and stream Se will be absorbed by 100% fraction. In the distillation process of AspenPlus simulation (figure 1) the component C, D, A, B, E are in the decreasing order relative to volatility. In AspenPlus we added two main component constraints to the flowsheet and the mole fraction is measured. The convergence algorithm was developed to measure the increase in maximum number of iteration operations in RADFRAC columns that obtain the exact measurement of convergence. Most of the light gases were forwarded to the flash drum and tray tower recovered 99% n-butane and propylene. Considering the data, it is obvious that LNKs appear only in the distillate while HKNs of the process are in the bottom products only. The mass flow rate, composition and split fraction of propylene and n-butane 102 lbmol/hr, 638 lbmol/hr, 0.579, 0.403, 0.001, and 0.999 are respectively.  The operating pressure changes to 1, 5, 15, and 20 atm that hypothesize the product stream with the changes in the condenser or reboiler duties and rate of change of temperature in the process. The operational cost will be changed by increasing and decreasing pressure. The P -T envelopes are used to determine energy cost and how changes in the pressure will induce impact on the column temperature. in the distillation process in a unit operation to separate the liquid mixtures the process is to extract high purity product. The propylene is the bottom fractional recovery element that is also known as key element and it is volatile therefore it is called light key (LK) and n-butane is least volatile in the process therefore it is called heavy key (HK). The process used widely accepted method that is referred as Fenske- underwood Gilliland (FUG) method.

Conclusion

The process is simulated by using AspenPlus software and models are considered under certain conditions. The data analytics section provides enough information about the process simulation, components, flowrates, and design specifications. The two constraints can be achieved by having alteration in the vapor pressure at FLASH 1 and FLASH2. NRTL-RK property is used for calculation. The two liquid phase split is observed as expected. On each run of simulation, the pressure values were changed that replaced the existing data and measured new conditions under the specified input values.

Reference of Multicomponent distillation project

Maples, R. (2000). Petroleum Refinery Process Economics. Penn wall books.

Appendix of Multicomponent distillation project

Preliminary calculation

Mass balances

Column specification of Multicomponent distillation project

Feasible P – T conditions

Fenske equation to determine N