[technologist]

Hi all, I am really stuck at this.

There is a CSTR for EO addition reaction. A ring type sparger for liquid EO (Ehtylene oxide) is given at the bottom. It is thru 1" pipe with 3 mm  57 no holes.

My objective is to find out the maximum possible flow of EO thru this sparger.

When I calculated the same considering Liquid EO & using Orifice equations I found very high flow but Actually we are restricted to only ~1500 Kg/hr EO rate.

So I checked heat transfer eqn for flow thru dip pipe & found that it will generate ~5% vaporization in the sparger feed pipe due to high rxr temp of 160°C. ( EO NBP is 10.5°C ).

Now the problem is that I could not find any correlation for two phase flow estimate in orifices.

Interesting thing is that when I consider 100% vapor EO as feed then it is coming ~1584 Kg/hr. But by heat transfer equation it should not be more than 5%.


Any suggestion...Any kind.....is welcome for solving this.