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UmeshMathur; Thank you very much for all the info. I'll surely check the references out. Thanks for taking the trouble, I appreciate it.:) -Dinu http://www.dinu.biz

Thanks for correcting me, UmeshMathur. Just wondering though, when you say "Bad data points can be diagnosed easily, thrown out, and the regressions repeated until you have a good fit across the range of P-T-X-Y" are you suggesting that one just scan the data curve and see what is physically...

Hi Mahesh; You are looking for binary interaction parameters for what equations? They could be different for each Equations of State. If you are using activity coeff methods (which you may not be) then they are different for those too. In any case, you will be able to get some info from the...

Thanks DickRussell! ...Time to get my hands dirty again!!!:-) http://www.dinu.biz

Hi DickRussell; I am reading your article "A flexible and reliable method solves single-tower and crude-distillation-column problems" Chem. Eng Oct17, 1983, and have a couple of questions for you; In your article, you say; 1. "Often, distillation calculations are performed with recycle loops...

DickRussell; Honestly, the basic tower design just came about without a good design effort in the start. Since I was working on modeling the dynamic behaviour of the column, the basic structure of the module was taken from that. I guess, it was assumed that the design would be simpler if we...

UmeshMathur; Yes, 0.03 CPU seconds is very impressive. Seems almost impossible without very close start values, doesn't it? I am wondering if these results were from calculations based on very good start values, either from previous iteration or user provided. Either ways, to be honest with you...

Thank you very much, DickRussell. Your input is greatly appreciated. What you have shown here, gives me a start, so I'll play around this a bit and see where I get to. Obviously, something like this, that seems to take you a few minutes (a couple of hours maybe) will take me days!:-) So, I'll...

Thank you UmeshMathur. I agree with you on the Russell's algorithm implementation being a non trivial task. I design and implement unit operations and thermodynamic VLE calculations (based on both EOS and Activity Coef methods). And in fact, the implementation I am testing is actually a port...

Can someone suggest a good example of a steady state distillation simulation, with all the necessary specs, to test out my implementation? I tried simulating the deethanizer in the "Fractionation Train" but I dont have all the necessary operating specs. I am trying to get Ethane and Methane in...

Thanks DickRussell. I appreciate your feedback.:-)

Hi all, I was wondering if anyone can direct me to a good reference on how to implement the Russells inside out algorithm for distillation column model calculations. What I need is to learn the theory and how it works. Also possibly get into the numeric method... Alternatively, is there any...