I'm studying the fixed-bed column adsorption models. I tried to calculate the breakthrough time from Adams-Bohart model ( predicted tb ). But I don't know why the calculated tb is negative.
The applied parameters from fitting the data are:
K=0.00013 L/mg min, N0=351.61 mg/L; and C0=40 mg/L, Z=6 cm, U=0.2 cm/min.
According to the literature, I consider C/C0= 0.1 to calculate the tb.
Please guide me if possible.