Method for removing trace sulfur dioxide in ultrapure sulfuric acid

• Main Author: CAO CHUANXING
• Format: Patent
• Language: Chinese; English
• Published: 22.04.2022
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

The invention provides a method for removing trace sulfur dioxide in ultrapure sulfuric acid, and relates to the technical field of chemical preparation. A method for removing trace sulfur dioxide in ultrapure sulfuric acid comprises the following steps: accurately weighing 1000g of ultrapure concentrated sulfuric acid, adding the ultrapure concentrated sulfuric acid into 200g of 31% ultrapure hydrogen peroxide solution, accurately calibrating the concentration of the ultrapure concentrated sulfuric acid to be about 5%, measuring the content of sulfur dioxide in an ultrapure sulfuric acid tank, and calculating the content of sulfur dioxide in the ultrapure sulfuric acid tank according to a molar equivalent reaction principle in chemistry. The required hydrogen peroxide molar weight and the required 5% hydrogen peroxide sulfuric acid solution amount are strictly calculated, the hydrogen peroxide sulfuric acid solution is slowly added into a sulfuric acid tank, the temperature does not exceed 50 DEG C, and most