Patent ID: 8640359

Claim:
A substrate treating method for drying substrates with a solvent vapor after treating the substrates with a treating liquid, said method comprising: a step of carrying out chemical treatment of the substrates immersed in treating liquids including a chemical solution stored in a treating tank; a step of carrying out deionized water cleaning of the substrates by immersing the substrates in deionized water in the treating tank; a step of decompressing an interior of a chamber enclosing the treating tank, to a predetermined pressure through an exhaust pipe communicating with the chamber; a step of supplying the solvent vapor into the chamber; a step of moving the substrates above the treating tank; a step of resuming decompression of the interior of the chamber through the exhaust pipe, and mixing deionized water into a gas flowing through the exhaust pipe, by a mixing device using a static mixer for mixing the gas and the deionized water and using an injection portion for injecting the deionized water upstream of the static mixer; and a step of separating and discharging the gas and liquid through a gas-liquid separating device downstream of the mixing device, through a gas-liquid separating device having a gas-liquid separating filter, a cooling pipe for cooling the filter, a first discharge portion for discharging the liquid separated, and a second discharge portion for discharging the gas separated, while increasing a flow rate of the deionized water when a solvent concentration in the gas-liquid separating device is high, and decreasing said flow rate when the solvent concentration in the gas-liquid separating device is low.