Patent ID: 8408234
Filing Date: 2013-04-02
Classification: H01L,Y10T

Abstract:
1. A process liquid supply system for supplying to a process vessel a process liquid formed by diluting a chemical liquid with a pure water, the process liquid supply system consisting essentially of: a pure water supply source connected to the process vessel through a supply pipe; a chemical liquid tank that stores a chemical liquid and supplies the chemical liquid stored therein to the supply pipe; a compressed gas supply source connected to the chemical liquid tank through a compressed gas supply pipe, the compressed gas supply source supplying a compressed gas to the chemical liquid tank to supply the chemical liquid from the chemical liquid tank to the supply pipe; a pressure adjusting part disposed on the compressed gas supply pipe at a position between the compressed gas supply source and the chemical liquid tank, the pressure adjusting part adjusting a pressure of the compressed gas supplied from the compressed gas supply source; and a control part that controls the pressure adjusting part based on elapsed time in a supply period and/or remaining amount of chemical in the chemical liquid tank and by continuously increasing the pressure of the compressed gas supplied from the compressed gas supply source to the chemical liquid tank gradually or in a stepwise manner regardless of the pressure of the chemical liquid tank after the supply of the chemical liquid from the chemical liquid tank to the supply pipe is started to avoid lowering of the processing liquid concentration.