Patent ID: 6782901
Filing Date: 2004-08-31
Classification: B08B,C01B,H01L,Y10S

Abstract:
A sulfuric acid recycle apparatus for recycling sulfuric acid in a wafer cleaning fluid prepared by mixing sulfuric acid and hydrogen peroxide solution comprising:a reaction bath having two openings formed of at least an introduction port and a discharge port for obtaining concentrated sulfuric acid by concentrating sulfuric acid in the wafer cleaning waste fluid introduced from the introduction port upon completion of a wafer cleaning process, said reaction bath including therein a plurality of partition plates for changing an advancing direction of the wafer cleaning waste fluid, and an inclination plate positioned at a portion closer to the discharge port than the partition plates so that the concentrated sulfuric acid flows along a surface thereof and then discharges into the discharge port; a wafer processing bath for processing wafers; and a supply unit for supplying the concentrated sulfuric acid to the wafer processing bath.