Patent ID: 9452397
Filing Date: 2016-09-27
CPC Classification: B01F,H01L

Claim Text:
1. A liquid processing method performed in a liquid processing apparatus including a mixing tank that mixes pure water and sulfuric acid to produce a mixed chemical liquid; a pure water supply line connected to the mixing tank; a sulfuric acid supply line connected to the mixing tank; a liquid processing unit that is connected to the mixing tank and configured to perform a liquid process on a substrate with the mixed chemical liquid produced in the mixing tank; a circulation line having a circulation pump that returns the mixed chemical liquid discharged from the mixing tank back to the mixing tank, both ends of the circulation line being connected to the mixing tank, the liquid processing method comprising: producing the mixed chemical liquid by mixing pure water and sulfuric acid in the mixing tank; and performing a liquid process on a substrate with the mixed chemical liquid in the liquid processing unit, wherein the producing of the mixed chemical liquid comprises: starting supply of the pure water to the mixing tank; starting operation of the circulation pump after starting the supply of the pure water to the mixing tank; starting supply of the sulfuric acid to the mixing tank after starting the operation of the circulation pump, and supplying the mixed chemical liquid produced in the mixing tank to the substrate, the liquid processing apparatus further includes a temperature controller configured to heat or cool the mixed chemical liquid flowing through the circulation line; and a cooling unit configured to cool the mixed chemical liquid, and the producing of the mixed chemical liquid further comprises: cooling the mixed chemical liquid by the temperature controller and the cooling unit; and cooling or heating the mixed chemical liquid bypassing the cooling unit by the temperature controller after cooling the mixed chemical liquid by the temperature controller and the cooling unit.