In any balance in the system, we have
Accumulation = input – output + generation – consumption……… (i)
However, while performing material balance in distillation column, we assume,
- Operation is carried out in steady state (i.e. constant volume) ⇒ Accumulation = 0
- We assume there is no reaction between components. ⇒ Generation = 0, Consumption = 0
Thus equation i now becomes
0 = input – output + 0 + 0
Input = output…….. (ii)
Because there are two sections in the column, there are two operating lines
- Operating line: Rectifying section
- Operating line: stripping section
Material balance around rectifying section:
Material balance around stripping section:
Rectifying operating line:
Rectifying operating line represents upper section of column. In the above figure, line AB represents operating line of rectifying section which follows the equation,
Stripping operating line:
Stripping operating line represents lower section of column. In the above figure, line AB represents operating line of stripping section which follows the equation,
About Author
Name : Pratiksha Shrestha
pratiksha.shrestha2001@gmail.com
Ms. Shrestha holds masters degree in food engineering and bioprocess technology from Asian Institute of Technology (AIT) Thailand. She is currently working for Government of Nepal at Department of Food Technology and Quality Control (DFTQC), Kathmandu. She is also a teaching faculty in College of Applied food and Dairy Technology (CAFODAT) affiliated to Purbanchal university, Nepal.