To provide a tank using a gas blowout nozzle, that enhances gas-liquid contact efficiency to remove volatile components of an organic solvent or the like without losing the efficiency in mixing and stirring a resin solution such as the resin solution containing the organic solvent.

A gas blowout nozzle comprising a gas introduction part 6 and a gas blowout part 7 is provided with a plurality of gas blowout holes 9 with a diameter D at the tip end part 8 of the gas blowout part 7 at a linear interval of ≥2D in the horizontal direction. The gas blowout nozzle is arranged under the bottom part of a stirring blade 2 and an inactive gas is blown into the resin solution 4.