6 replies to this topic

[kasiagaspar]

I need to estimate what is going in to my distillation column, I use Pro/II.

I know the molar composition on the top of the column, and here in not a problem.

On the bottom the only thing I have is a distillation curve. I know the boiling points for 5,10, 20... % of the bottom products. The method for it is D86.

Based on this information I need to estimate somehow the feed.

Did anyone have similar problem? Or have an idea how to solve it?

Best regards

[djack77494]

I need to estimate what is going in to my distillation column, I use Pro/II.

I know the molar composition on the top of the column
On the bottom the only thing I have is a distillation curve. I know the boiling points for 5,10, 20... % of the bottom products. The method for it is D86.

Based on this information I need to estimate somehow the feed.

Did anyone have similar problem? Or have an idea how to solve it?

Best regards

Maybe I'm missing something, but you could just add the known composition of the column overhead * its flowrate to the known composition of the column bottoms * its flowrate. If you don't have any sidestreams, this will give flowrate & composition of the feed by material balance.
Doug

[Milutin]

To determine feed composition you need both product flows and for bottom you missing density.

Regards,

Milutin

[kasiagaspar]

Is it possible to assume somehow the density of naphtha stream? Or at least some close value?

[Milutin]

You can assume density, if naphtha is reformer feed, end distillation about 160-170degC, density is around 0.72-0.74 g/cm3, if light naphtha 0.6 to 0.65dg/cm3.

Regards,

[kasiagaspar]

Thank you very much...
Seems to be resonable...

As i have no other choice i need to make some assumptions...

Best regards,

kasiagaspar

[darshan]

Can anybody provide me tutorials for pro-ii.

PLEASE :-)