1 reply to this topic

[Guilhermexift]

Hello,

 

In a chlor-alkali plant sodium hypochlorite is produced by the following chemical reaction at 1 bar a:

 

Cl2 + 2NaOH --> NaClO + NaCl + H2O

 

That chemical reaction occurs inside an absorption tower and the reactants inlet condition is:

 

a) Caustic soda: 45°C / 18% wt (aqueous solution);

Chlorine: 70°C (gaseous);

c) I already know the heat of reaction at 25°C.

 

Sodium hypochlorite is very unstable and the product need to be cooled.

 

I need to estimate the heat of reaction at reactants condition and the outlet temperature of the products. My questions are:

 

a) Is it possible to estimate the heat of reaction without knowing the outlet temperature or vice versa?

I have to choose the outlet temperature that I want to keep the products and consider that?

c) If I already know the final temperature, how can I estimate the heat of reaction by specific heat integration? What temperature I consider as T1: 45°C, 70°C or an intermediate temperature between those values?

 

 

[breizh]

Hi,

To my knowledge, you need to perform mass and heat balances along the column to get the height of the unit. You need to define a temperature within the column, it's an iterative calculation on dZ .

For sure you need an external heat exchanger to remove the excess of calories due to the reaction.

Note: Probably modern tools should help you out. 

 

https://patents.goog...0050169832A1/en

 

Good luck

Breizh