Abstract

This is a study of using Aspen HYSIS to design a separation process o

ammonia and water. In this study, it is to understand the usage of condenser,

valve and separation process. Information from the given manual as a guide are

used in the HYSIS program.

1.0PROCEDURE

Methodology for process separation of ammonia and water using Aspen HYSIS:

1. First, the Aspen HYSIS user interface is opened and Aspen HYSIS blank

simulation is chosen.

2. Condenser, separator, and valve models are dragged one by one from the

unit operation model pallet onto the flow sheet.

3. All streams from each unit operation models are connected. Each stream

and model block is renamed.

4. Setup, components, properties, streams, and blocks inputs from data

browser are filled with related information and values.

5. ‘Next’ button is pressed as for running the simulation process.

2.0PROCESS FLOW DIAGRAM (PFD)

Figure 1: Process flow diagram of ammonia and water through a separator.

3.0WORKBOOK

Stream Name Feed 1 3 4Vapor/ Phase Fraction 1.0000 1.0000 1.0000 0.0000Temperature [C] 143.6 143.6 131.6 131.6Pressure [bar] 17.42 17.42 6.900 6.900Molar Flow [kgmole/h] 4536 4536 4536 0.0000Mass Flow [kg/h] 7.810e+004 7.810e+004 7.810e+004 0.0000Std Ideal Liq Vol Flow [m3/h]

117.1 117.1 117.1 0.0000

Molar Enthalpy [kJ/kgmole]

-7.962e+004 -7.962e+004 -7.962e+004 -2.352e+005

Molar Entropy [[kJ/kgmole.C]

162.7 162.7 169.9 84.32

Heat Flow [kJ/h] -3.611e+008 -3.611e+008 -3.611e+008 -0.0000Liq Vol Flow @ Std Con [m3/h]

115.7 115.7 115.7 0.0000

Master Comp Mole Frac (Ammonia)

0.8088 0.2020

Master Comp Mole Frac (Water)

0.1912 0.7980

Figure 2: Parameters computed for each streams.

4.0QUESTIONS AND DISCUSSIONS

1. What is the temperature of the outlet stream of the condenser?

According to Figure 1, the outlet stream temperature of condenser, from E-100 to VLV-100 is 143.6˚C.

2. What are the mole fractions for ammonia and water in the vapor and liquid stream of the separator?

Mole fractions for ammonia and water in the vapor stream of the separator are:-Ammonia = 0.8088Water = 0.1912

Mole fractions for ammonia and water in the liquid stream of the separator are:-Ammonia = 0.2020Water = 0.7980

3. Determine the mass flow rate for each outlet stream of the separator.

Mass flow rate of vapor stream = 78100 kg/hMass flow rate of liquid stream = 0.0000 kg/h

All the values inserted in the Aspen HYSIS according to the manual provided output

the results as show in the Figure 2. It is known that the condenser is used to release

heat from the heater E-100 and maintaining the temperature opted. The valve VLV-100

channels the stream to the separator, and separation process occurs at the separator.

Ammonia and water are separated into vapor and liquid streams. The produced values

are assumed accurate using Advanced Peng-Robinson property package.

Appendices