Acid gas scrubber with wash solution recycle

[Fabcap]

Greetings everyone.

This is my first post here, but let's go straight to business.

I am starting to work for an engineering company and my first project is to design a scrubber to remove HCl and SO2 from tail gas.

The customer wants to use 10% NaOH in water with recycle of the wash solution; liquid flow will be something like 30 times bigger of the stoichometric minimum.

How can I calculate the steady-state concentration of sodium chloride and sodium sulphite in the wash solution?

 

[ajs1972]

Hello:

Do you have aspen plus process simulator? Look the document.

Regards

 

[Fabcap]

No, I don't have Aspen Plus; I'm doing the design without specific software.

But I found a solution in the meantime.

 

[gr2vessels]

Fabcap,
Would you care to share with us, the forum members you asked for help, what is the solution you found? Perhaps it could be useful to someone else.
Cheers,
gr2vessels

 

[Fabcap]

It is a simple mass balance. At the steady state, the flow rate of salts with the discarded wash solution must be equal to the production rate by chemical reactions.

Thus, steady-state concentration is controlled by the recirculation ratio.

 

[gr2vessels]

Really simple. Good one.
Cheers,
gr2vessels