Model distill

 Compounds
  ethylene  
  propylene
  propane
  hydrogen
  nitrogen
 End Compounds

 Objects
  ! feed stream
  feed           = Feed
  feed_lag       = Stream_Lag
  feed_cooler    = Vessel
  feed_flash     = Flash
  liq_mixer      = Mixer
  vap_mixer      = Mixer

  ! condenser and reflux
  condenser      = Vessel
  drum           = Flash
  reflux         = Splitter

  ! column stages
  stage[1:8]     = Stage_1

  ! reboiler
  sump           = Vessel
  reboiler       = Vessel
  reboiler_flash = Flash

  ! mass and massflows
  sump_mass      = Mass
  feed_massflow  = Massflow
  cleu_massflow  = Massflow
  btms_massflow  = Massflow
 End Objects

 Connections
  ! feed streams
  feed.*                      = feed_lag.inlet.*
  feed_lag.outlet.*           = feed_cooler.inlet.*
  feed_cooler.outlet.*        = feed_flash.inlet.*
  feed_flash.outlet_vap.*     = vap_mixer.inlet[1].*
  feed_flash.outlet_liq.*     = liq_mixer.inlet[1].*

  ! liquid down the column
  liq_mixer.inlet[2].*        = stage[1].l_out.*
  liq_mixer.outlet.*          = stage[2].l_in.*
  stage[2:7].l_out.*          = stage[3:8].l_in.*
  stage[8].l_out.*            = sump.inlet.*

  ! reboiler
  sump.outlet.*               = reboiler.inlet.*
  reboiler.outlet.*           = reboiler_flash.inlet.*

  ! vapor up the column
  reboiler_flash.outlet_vap.* = stage[8].v_in.*
  stage[3:8].v_out.*          = stage[2:7].v_in.*
  vap_mixer.inlet[2].*        = stage[2].v_out.*
  vap_mixer.outlet.*          = stage[1].v_in.*

  ! condenser
  stage[1].v_out.*            = condenser.inlet.*
  condenser.outlet.*          = drum.inlet.*
  drum.outlet_liq.*           = reflux.inlet.*
  reflux.outlet[2].*          = stage[1].l_in.*

  ! mass and massflow meters
  sump.reserve.*              = sump_mass.acc.*
  feed.*                      = feed_massflow.stream.*
  drum.outlet_vap.*           = cleu_massflow.stream.*
  reboiler_flash.outlet_liq.* = btms_massflow.stream.*

  ! stream pressures
  strm_p                            = stage[1].v_out.p
  strm_p                            = stage[2:8].l_out.p
  strm_p                            = stage[3:8].v_out.p

  ! feed and stage pressures
  fd_p                              = stage[1:8].l_res.p
 End Connections


 Model custom

  Parameters
     fd_t     = 370.0  ! K
     fd_p     = 3.11e6 ! Pa
     fd_c2h4  = 0.28   ! mol%
     fd_c3h6  = 0.6184 ! mol%
     fd_c3h8  = 0.0916 ! mol%
     fd_h2    = 0.01   ! mol%

     strm_p   = fd_p   ! Pa
     fd_ndot  = 1.0
  End Parameters

  Variables
     fd_mdot  = 0.395  ! kg/sec
  End Variables

  Connections
     fd_t     = feed.t
     fd_p     = feed.p
     fd_c2h4  = feed.x[1]
     fd_c3h6  = feed.x[2]
     fd_c3h8  = feed.x[3]
     fd_h2    = feed.x[4]
     fd_mdot  = feed_massflow.mdot
     fd_ndot  = feed.ndot
  End Connections

  Intermediates
  End Intermediates

  Equations
  End Equations

 End Model