ENERGY BALANCE AROUND EG REFINER

For refining of ethylene glycol we selected tray column, selection criteria for this is given in designing of EG REFINER.

 4.6.1: Balance around Reboiler

Inlet Temp of process stream = t₁          =   90  ^oC

Outlet Temp of process stream= t₂          =  157  ^oC

    ta     =  123.5 ^oC

Inlet Temp of steam = T₁ =Ta               = 212^oC

Outlet Temp of steam =   T₂ =Ta          = 212^oC

Mass flow rate of steam                        =25445 Kg/hr

Latent heat of steam                              =1882 KJ/Kg

Enthalpy of steam entering the reboiler =47887967 KJ/hr

Preheat = Q1=mCp∆t                          = 9238925 KJ/hr

Latent Heat = Q2 = m λ                       = 38649042 kJ/ hr

Total Heat =Q = Q1+Q2                     =47887967 kJ/ hr

Enthalpy of stream leaving                     =47887967 kJ/ hr

4.6.2: Balance around Condenser

 Inlet temperature of the process (condensing)stream= T₁ =T =154 ^oC

Outlet temperature of the process stream= T₂  =T=154 ^oC

Inlet temperature of the water                = t₁  = 25 ^oC

Outlet temperature of the water = t₂  = 85 ^oC

Mass flow rate of the process stream = m  = 33070 kg/hr

  ∆ of Process Stream                               = 916 K J / Kg

 Enthalpy of process stream entering the condenser   Q = m *

    = 33070 *916 = 30292120  KJ/ hr

C_p of water       = 4.187 KJ/kg k

Mass flow rate of cooling water m                 = 120695 Kg /hr

Enthalpy of water leaving                              = 120695  *(4.18738 * (85-25))

        =30292120  KJ/ hr