Patent ID: 7144552
Filing Date: 2006-12-05
Classification: B01F,B01J,C01C,Y10T

Abstract:
1. A chemical solution preparation apparatus comprising a chemical solution refinement device, which dissolves a chemical gas into a liquid and prepares a refined chemical solution, wherein the liquid is one of pure water or a mixture having a predetermined composition, the chemical solution refinement device including: a preparation tank for storing the liquid; a first pipe for supplying the chemical gas into the preparation tank; a first valve arranged in the first pipe for opening and closing the first pipe; a second pipe for discharging the chemical gas that was not dissolved in the liquid during the gas dissolving from the preparation tank; a second valve arranged in the second pipe for opening and closing the second pipe; a third pipe connected to the preparation tank for draining a predetermined amount of the chemical solution out of the chemical solution preparation apparatus during the gas dissolving to increase the purity of the chemical solution; a third valve arranged in the third pipe for opening and closing the third pipe; and a controller for operating the first, second and third valves, wherein, when the controller is programmed to operate the first valve so as to supply the chemical gas to the preparation tank, the controller is programmed to operate the second valve and the third valve so as to simultaneously discharge an adjusted amount of the undissolved chemical gas and a predetermined amount of the chemical solution that is under preparation from the preparation tank.