Next we will define the Composition of the two feed streams. Note that you can change the global unit set to Field if the units are different than those displayed below. For BZFEED, enter a Temperature of 100☏, a Pressure of 15 psia, and a Molar Flow of 100 lbmole/hr. For H2FEED, enter a Temperature of 120☏, a Pressure of 335 psia, and a Molar Flow of 310 lbmole/hr. First we will define the Conditions of each stream.
Go to the Worksheet tab to define streams H2FEED and BZFEED. Create 2 inlet streams: H2FEED, BZFEED and 1 outlet stream: ToPreHeat. Click the Simulation button in the bottom left of the screen.įirst we will place a Mixer and a Heater block onto the flowsheet.ĭouble click on the mixer (MIX-100) to open the mixer property window. We are now ready to enter the simulation environment. Select Basis-1 and click Add Set to Fluid Package. Close this window when complete.Īttach this reaction set to a fluid package by clicking the Add to FP button. This indicates that the reaction will convert 99.8% of benzene regardless of temperature. In the Basis grid select Benzene as Base Component, Overall for Rxn Phase, 99.8 for Co, and 0 for both C1 and C2. Enter -1, -3, and 1, respectively, for stoichiometry coefficients. In the reaction property window, add components Benzene, Hydrogen, and Cyclohexane to the Stoichiometry Info grid. Once a new reaction (Rxn-1) can be seen on the reaction set page, close the Reactions window shown below.ĭouble click on Rxn-1 to define the reaction. Select the Hysys radio button and select Conversion. In Reactions | Set-1 select Add Reaction. Go to Reactions folder in the navigation pane and click Add to add a reaction set. We must now specify the reaction involved in this process. In the Fluid Packages folder in the navigation pane click Add. Use the Find button to select the following components: Hydrogen, Nitrogen, Methane, Benzene, and Cyclohexane.
In the Component Lists folder, select the Add button to create a new HYSYS component list.ĭefine components. Start Aspen HYSYS V8.0, select New on the Start Page to start a new simulation.Ĭreate a component list. They may not reflect an industrial application or real situation. The examples presented are solely intended to illustrate specific concepts and principles. Liquid Split 70% of liquid stream goes to distillation column Purge Stream Purge rate is 8% of vapor recycle stream Reactor Stoichiometry Conversion Outlet temperature Pressure dropīenzene + 3H2 Cyclohexane 99.8% of benzene 400☏ 15psi Hydrogen Feed (H2FEED) Hydrogen Nitrogen Methane Benzene Total Flow (lbmol/hr) Temperature (☏) Pressure (psia)ĭistillation Column Number of stages Feed stage Reflux Ratio Cyclohexane recovery Condenser Pressure Reboiler Pressureġ5 8 1.2 99.99 mole % in bottoms 200 psia 210 psiaįeed Preheater Outlet Temperature Outlet Pressure Process operating specifications are listed on the following page.įeed Streams Benzene Feed (BZFEED) Hydrogen Nitrogen Methane Benzene Total Flow (lbmol/hr) Temperature (☏) Pressure (psia) The majority of the liquid stream leaving the flash tank goes to a distillation column to purify the cyclohexane product, while a small portion of the liquid stream is recycled back to the feed mixture to minimize losses of benzene. The vapor stream coming off the flash tank is recycled back to the feed mixture after a small purge stream is removed to prevent impurities from building up in the system. The reactor effluent stream is then sent to a flash tank to separate the light and heavy components of the mixture. This simulation will use a conversion reactor block to model this reaction. This feed mixture is then sent to a fixed-bed catalytic reactor where 3 hydrogen molecules react with 1 benzene molecule to form cyclohexane. Fresh benzene and hydrogen feed streams are first fed through a heater to bring the streams up to reactor feed temperature and pressure conditions. The simplified flowsheet for this process is shown below.
Background/Problem Construct an Aspen HYSYS simulation to model the production of cyclohexane via benzene hydrogenation. Lesson Objectives Ĭonstruct an Aspen HYSYS flowsheet simulation of the production of cyclohexane via benzene hydrogenation Become familiar with user interface and tools associated with Aspen HYSYSĪspen HYSYS V8.0 Knowledge of chemical process operationsģ. AspenTech Incorporations Aspen Hysys V8.8Ĭases Solved in Hysys Version 8.0 are same as Version 8.8Ĭyclohexane Production with Aspen HYSYS® V8.0 1.