1 reply to this topic

[nilesh.shah]

System Details

Column Dia - 150 NB
Column Lenght - 12 Mts
Pressure at different location
At the source ( At the vacuum Header) 711 Torr
After condenser 700 Torr
At the top of the column 620 Torr
At the bottom of the column - 580 torr
DP across the column - 40 torr
Operating temp - 130 Deg C
Utility in condenser - Cooling Water
Vapor Flow - 75 Kg/hr
R.R - 5
Product flow rate - 15 Kg/hr

The problem i am facing in vacuum distillation is the pressure drop across the condenser which is around the 80 Torr. I had done the calculation for the pressure drop accoridnng to the velocity at the operating temp and pressure which is coming out low. The velocity of the vapor is20 m/sec. As per my knowledge at 60 Torr, the 50 m/sec velocity is good

What are the possible reson for it and are the critical paramtre which i have to take care for calculation

Attached Files

•  Packed_column_Model__1_.pdf   94.14KB   327 downloads

[Zauberberg]

I would say that total pressure drop between the condenser and column top also includes column top nozzle exit losses, overhead line losses, condenser entrance nozzle losses and finally the condenser pressure drop itelf. Have you included all these items in pressure loss calculation?

However, 0.1bar pressure drop in vacuum system - assuming that instrument readings are correct - is huge and surely a sign of irregular operation (and/or design). Can you explain this system in more details, and give some background for this application?

Best regards,