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 Non-linear curve fitting for breakthrough curve		  New Topic  Reply to Topic
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Vishal1987

India
1 Posts
Posted - 10/19/2018 :  02:05:41 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin):
Operating System:
Dear Friends,
I need to use nonlinear fit for Thomas, Yoon-Nelson and Adams-Bohart adsorption models. I tried to build these equations using fitting function builder, but I fail to do so.
Equations are
Thomas model = y=1/(1+exp((K*q*M)/F-(K*C*x)))

Yoon-Nelson model= Y=exp(K*A-K*x)

Adams-Bohart model= Y= exp(K*C*x-K*N*F)

K is the respective model constant and it varies with different flow rates and bed height,
C is the initial concentration it is 1 mg L-1
x (independent variable) which is time it varies from 0 to 180 min
I tried to edit some default functions and use but it didn't work. I'm getting an error massage saying that, Fitting failed on all datasets"
Please help me on this

VISHAA

AmandaLu

439 Posts
Posted - 10/19/2018 :  04:16:45 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

Could you please send your fitting function and data to tech@originlab.com so I can check?

Thanks,
Amanda
OriginLab Technical Service
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