Hi,
Please help me. I am doing a separation of:
- Acetol: 1.25kmol/h (HK)
-Water: 216.647kmol/h (LK)
-methanol: 0.803kmol/h
-ethanol: 0.412kmol/h
-1-propanol: 0.67kmol/h
I am aiming for 95% purity acetol, however, when I apply my feed compositions and average relative volatilities to the underwood equation I get a minimum reflux ratio of -1. Why is this? What am I doing wrong?
component gm xf xd axf/(a-θ) axd/(a-θ) acetol 1 0.0056875 2.86E-05 7.02E-07 3.53E-09 water 5.14E+00 0.9857358 9.91E-01 6.25E-04 6.29E-04 methanol 1.83E+01 0.0036536 3.68E-03 8.24E-06 8.29E-06 ethanol 1.15E+01 0.0018746 1.89E-03 2.66E-06 2.67E-06 propanol 5.53E+00 0.0030485 3.07E-03 2.08E-06 2.09E-06
Thanks!