# Evaporation Rate of Hydrochloric acid

I'm currently working in a Chemical Plant as an intern, and I was given a task to improve the efficiency of the blower, which is already in place right now, by designing a new blower for the appropriate flow rates.

We have a filling station in the plant for HCl liquid, which fills the HCl (30-32% conc. at 20 m$$^3$$/hr) into tankers for transportation purposes. The problem is when HCl is filled up in a tank, it releases fumes, which are harmful for the people present near the filling station.

We have to recommend a blower, so that most of the generated fumes can be treated at an appropriate flow rate. But we don't know how to proceed with this, as we wouldn't know about the evaporation rate of HCl while it is flowing inside the tank.

Some technical information:

1. Temperature, Pressure can be assumed as 30 $$^{\circ}$$C, 1 atm.
2. Flow rate of HCl inside tank: 20 m$$^3$$/hr.
3. Capacity of Tank: 25 Metric tonnes
• Kudos to you for considering the health of workers! The simplest and most economical way to avoid HCl vapors is to vent (i.e., waste) at a high altitude, like flaring CH4 from petroleum drilling. However, the vented HCl is a raw material if you capture it in H2O - you should be able to get up to about 20% before the vapor pressure of HCl is evident. Run the vented vapors thru a wet column and sell the diluted HCl as a by-product (cheap?). Up to about 20% HCl has no significant odor of HCl. Commented Jul 15, 2022 at 13:57
• I don't think these would work. We have to remove fumes from a tanker, which would be filled up and transported to another location. While being filled, the HCl will release fumes, and we need to find the amount of fumes generated, so that we can suck those out with the help of a blower, and transport them back to the HCl storage. I just need the amount of fumes generated, so that I can recommend a blower with an appropriate flow rate, and appropriate pipe diameter which can handle the pressure drop. Commented Aug 25, 2022 at 11:46