Function: separation principle: gas stripping is a physical process, which uses gas medium to destroy the original gas-liquid two-phase equilibrium and establish a new gas-liquid equilibrium state, so that a component in the solution can be desorbed due to the decrease of partial pressure, thus achieving the purpose of separating substances. For example, A is liquid, B is gas, B is dissolved in A to achieve gas-liquid equilibrium, and B is the main gas phase in the gas phase. When the stripping medium C is added, the fractions of A and B in the gas phase decrease, which destroys the gas-liquid equilibrium and both substances A and B diffuse into the gas phase. However, because B is the main gas phase, a new equilibrium relationship will often be established, so a large amount of B medium diffuses to the gas phase, thus achieving the purpose of gas-liquid separation. The degree of stripping can be controlled by controlling the amount of stripping medium.