Sorry for the long text post but I have alot of problems with this task.
I have a large problem to solve although I only wish to seek help and guidance not for someone to actually do it for me.
My problems in that I need to design an absorption tower (dryer), to remove water content from a gas stream using a stream of concentrated sulfuric acid I have to design the size, type of packing, temperature change, pressure drops ect. (packing is to be first stage randomly packed and second stage trays), there is also a recycle stream which entres between the two different transfer stages, this recycle is also cooled so will effect the temperature profile.
All I have to go off is the compositions and flow rates of the gas and liquid in and out as I have already done a complete mass and mole balance.
I have a good understanding of the process and recently sat an exam on this an got 80%, but I cannot work out where to start with such little information. I have to make assumptions that the flow rates stay constant, but in fact one stream out triples, also the temperature stays constant which is doesn't do to dilution and a cooled recycle stream, the transfer rate stays constant which it possible cannot as it has different packing. I have seen a lecturer for help but he just said to split it up into 10 sections and work at it from there, but everywhere I read it says to do an overall calculation then split it up which I think is correct, although I do understand possibly treating the two types of packing separately from the beggining.
So far I have constructed an operating line on a y vs. x graph, but this seems usless without an equilibrium line in which I could extrapolate some data, but my lecture told me they would be the same so I abandoned that idea.
Also tried to use Henry's constant as the system is gas phased controlled and find value of y*, but I do not know which constant to use, (I presume the water vapour), but I cannot even find this.
I also tried an idea that y=y*, for a total overall transfer but I cannot see how this would enable me to further split up the system to get more accurate individual sections.
Thankyou for reading and I hope you can help guide me in the correct direction.
Also I would say that if someone was willing to help me it would be great to be able to communicate over msn so there isnt the long delay of emailing, I know this would mean anyone giving up there own time and I would be willing to pay them £20+ say per hours ish, for them giving up their time. I would posted all my activity on this tread so to maybe help anyone else with a simular problem.