Purification of nitric acid system can be carried out through the following steps:
Preparation work: Firstly, prepare the necessary experimental equipment, including reactors, cooling chambers, glass tubes, etc. Ensure that all equipment is clean and dry.
Mixed acid solution: Add concentrated sulfuric acid to the reactor, followed by 68% nitric acid, and stir for a few minutes to mix. It should be noted that the mixed acid should not exceed 1/2 of the reactor and should be covered to prevent volatilization.
Heating distillation: After adding the material, slowly heat it up. When the temperature reaches 86 degrees, nitric acid gas is distilled out.
Cooling collection: After entering the cooling chamber, the gas condenses into nitric acid and flows out from the acid outlet to obtain over 90% concentrated nitric acid.
Purification again: If it is not pure enough, the nitric acid produced can be processed again according to the above method to obtain over 99% nitric acid. When repeating this process, it is important to add sulfuric acid first and then nitric acid, and to pay attention to temperature control because the concentration of nitric acid is already very high at this point, and the temperature of the two mixtures rises rapidly.
The above is a simple method for purifying nitric acid. It should be noted that laboratory safety regulations must be strictly followed throughout the entire process, especially when dealing with concentrated sulfuric acid and nitric acid, as they are both highly corrosive chemicals.  more details,please contact us,we're talk more,thanks!!!

Laboratory Glass vacuum distillation packed column apparatus