Whenever there is a contact between gas and liquid in the column, there will be maximum chances of entrainment. It’s just entrapment of one substance by another one along with contaminants. Such mist and liquid droplets cannot be vented off directly to the atmosphere. And it can lead to serious losses of the process fluid and equipment damage in mass transfer operations.
This entrained component can be easily get separated by using demister pad. This pad can directly convert entrained vapours/mist into liquid and traps the vapours to get vented off with gas. It helps to collect entrained vapours in the form of liquid drops and separates it from gaseous mixture. The main working principle of Demister is to separate liquid by coalescing smaller liquid droplets from the gasses and allow it to get drop into the liquid pool.