Packed column
Impermeable graphite packed columns use in corrosive media such as hydrochloric acid, sulfuric acid absorption, condensing, distillation, evaporation, filtration, washing etc. unit operation, it is the liquid-gas contacting heat and mass transfer process.
Mostly gas-liquid counter-current flow, the liquid flows from the top of column through spray device and then evenly spray down, the gas goes up from the bottom of column.

 

 

Bubble-cap column
It is a kind of bubble-cap plate column, gas or steam flows through the bubble-cap on the plate, which develops dispersed phase and then contacts with the liquid in on the plate.
The main components of the equipment are column body, bubble cap, overflow weir, downcomer and inlet and outlet of liquid, gas.