Tutorial Hysys

HYSYS CONVERSION REACTORS By: Eko Ariyanto, ST., MChemEng Muhammadiyah University of Palembang Engineering Faculty Department of Chemical Engineering

Tutorial on Styrene Styrene is a monomer used in the production of many plastics. It has the fourth highest production rate behind the monomers of ethylene, vinyl chloride and propylene. Styrene is made from the dehydrogenation of ethylbenzen :

Procedure to Install a Conversion Reaction Set 1. Start HYSYS 2. Open a new case by clicking on the blank white page OR use the commands File New. Start a New Case

3. Since these compounds are hydrocarbons, use Peng-Robinson thermodynamic package. (Additional information on HYSYS thermodynamics packages can be found in the Simulation Basis. An alternative package for this system is the PRSV) 3.1. Select the Fluid Package menu tab and press the Add Button Press Add Button

3.2. Select the EOS filter radio button to see only Equation of State (EOS) 3.3. Then select the Peng Robinson Equation of State Step 3.2 Step 3.3

4. Install the chemicals for a styrene reactor: ethylbenzen, styrene, and hydrogen. Note: Just typewrite the name of chemical into Match box and then click Add Pure button

5. Lets look at one of the components and see some of the physical properties that it is using. 5.1. Select Ethyl benzen 5.2. Click on the View Component button Examine the temperature dependent properties given on the Tdep page 5.4. Notice that the ideal gas enthalpy has been correlated using a 5 th order polynominal

Now return to the Simulation Basis Manager by closing the Component List View window Press the close button or X Select the Rxns tab and then press the Simulation Basis Mgr… button Rxns tab

The reaction component Selection view will appear, if you click Add Comps… button

And click A dd This Group of Components

To install a reaction press the Add R xn…

On the Stoichiometry tab add all of the components to the component list by using the drop down list. Select ethylbenzene from the drop down list in the Edit Bar. The Mole Weight column should automatically provide the molar weight of ethylbenzene. In the Stoich Coeff field enter a stoichiometric coefficient of -1 (i.e. 1 moles of ethylbenzene will be consumed). Notice that the coefficient will be negative for reactants and positive for product.

Now define the rest of the Stoichiometry tab as shown in the adjacent figure. Go to Basis tab and set ethylbenzene as the Base Component and Conversion to 80 %. The status bar at the bottom of the property view should now show the Ready message. Note that the conversion reaction can be a function of temperature. This is a simple polynomial fit to conversion as a function of temperature data. Using this type of reaction set we will be able examine mole and energy balance without knowing the kinetics. Close the property view

By default, the Global Rxn Set is present within the Reaction Sets group when you first display the Reaction Manager. However, for this procedure, a new Reaction Set will be created. Press the Add Set button. HYSYS provides the name Set-1 and opens the Reaction Set property view. To attach the newly created Reaction to the Reaction Set, place the cursor in the <empty> cell under Active List.

Open the drop down list in the Edit Bar and select the name of the Reaction. The Set Type will correspond to the type of Reaction which you have added to the Reaction Set. The status message will now display Ready. Press the Close button to return to the Reaction Manager.

To attach the reaction set to the Fluid Package (your peng robinson thermodynamics), highlight Set-1 in the Reaction Sets group and press the Add to FP button. When a Reaction Set is attached to a Fluid Package, it becomes available to unit operations within the Flowsheet using that particular Fluid Package. The Add ’Set-1’ view appears, from which you highlight a Fluid Package and press the Add Set to Fluid Package button.

Press the Close button. Notice that the name of the Fluid Package (Basis-1) appears in the Assoc. Fluid Packages group when the Reaction Set is highlighted in the Reaction Sets group Now Enter the Simulation Environment by pressing the button in the lower right hand portion

Install a conversion reactor. Either through the Flowsheet, Add operation F12 or icon pad. Click on General Reactors and then a small pad pops up with a choice of 3 reactors. Choose the conversion reactor. Click on the Conversion Reactor icon, then release left mouse button. Move cursor to pfd screen and press left mouse button. Double click on the reactor to open. Conversion Reactor

Add stream names and a new reactor name as shown. After naming these streams the following errors appear: Requires a Reaction Set and Unknown Duty.

Next add the reaction set by selecting the reactions tab and choosing Reaction Set from the drop down menu. Close the Conversion Reactor

Open the workbook Now add a feed composition of pure ethylbenzene at 217 gmol/s, 880 K, 1.378 bar. Remember you can type the variable press the space bar and type or select the units. Isn’t it strange that you can’t see the molar flowrate in the composition window? Let’s add the molar flowrates to the workbook window. Go to Workbook Setup using the menu commands at the top of your screen. Press the Add button on the right side Select Component Molar Flow and then press the All radio button.

To change the units of the variables go to Tools, preferences, variables tab. Clone the SI set and give this new set a name. Change the component molar flowrate units from kmol/hr to gmol/s if needed. Change the Flow units from kmol/hr to gmol/s Next change the Energy from kJ/hr to kJ/s. Save preference set as well as the case. Remember that you need to open this preference set everytime you use this case. Now run the simulation. For an isothermal reactor specify the outlet temperature.

For the adaiabatic reactor, delete the temperature specification and specify the heat duty as 0. The heat duty can be specified in several ways: in the workbook under the Energy Streams tab in the reactor in the Design Tab under the parameters option in Duty.

Now change the conversion. The changes that we will make now will only effect this reactor. Go to the reactions tab in the reactor. Select the Conversion% radio button. Now type a new conversion value. Notice that this is in percent conversion. Use the spread sheet operations to check you conversion values.

Tutorial Hysys

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