Design of brine treatment tanks

[david207]

Hi, I have to design brine treatment tanks for a chlorine production plant. Na[sub]2[/sub]CO[sub]3[/sub] will be added in the first tank to precipitate out calcium and NaOH will be added in the second tank to precipitate out magnesium. I was wondering if there was any way to calculate a rough estimate of the size of the tanks by just taking into account these precipitation reactions and ignoring the effects of minor impurities. Flow rates and conditions are known.
Thanks

 

[bimr]

Is this a water treatment processes that you are proposing? If so, please present the water analysis.

If this is a water treatment scheme, what you have listed will never work. It is not possible to selectively precipitate.

 

[MJCronin]

You might want to consider a standard tank size and system designed specifically for brine ...

http://www.brinesystems.com/

Tell us more about how your system will operate ....

MJCronin
Sr. Process Engineer

 

[gcastan]

consider the residence time and flowrates

Gabriel Castaneda, P.E.

http://www.gabcheminc.com

 

[itdepends]

And avoid double posting the same topic

As a chem eng/metallurgist the first part of any answer I give starts with "It Depends"

 

[HAMZAAHMED]

You can design the reaction tank depend on the residence time .

Actuality reaction between Ca and Na[sub]2[/sub]CO[sub]3[/sub] need time between 40-50 mins " if your Na[sub]2[/sub]CO[sub]3[/sub] good mix in brine " , so you can use this time in calculating the Volume .

*Exp : lets say you have flow rate about 50 m[sup]3[/sup]/hr , and the time as we said its 45 mins , so the reaction tank volume about 32 m[sup]3[/sup] . other thing you can put the inlet line of brine from bottom nozzle for the tank to make more disturbance and decrease the time of reaction .

I don't know why you not mention the sulfate in your topic , but you shall have two reactors in series with same volume .