A method for preparing hydrogen peroxide is characterized by comprising the following steps: (1) neutralizing sodium peroxide aqueous solution to 9.0-9.7 with phosphoric acid or sodium dihydrogen phosphate (nah2percarbonate) to generate Na2 [hpo4] and H2. (2) cooling the aqueous solution of Na2HPO4 and H2O2 to +5-5℃, so that most of Na2HPO4 is replaced by Na2HPO4.65438+. (3) The mixture containing Na2HPO410H2O hydrate and aqueous hydrogen peroxide solution was separated from sodium percarbonate in the eccentric separator, so as to crystallize Na2HPO410H2O from the mixture containing a small amount of Na2POO4. (4) the aqueous solution of hydrogen peroxide containing a small amount of Na2HPO4 is evaporated in an evaporator to obtain H2O2 and H2O2-containing steam, and the Na2HPO4 concentrated salt solution containing hydrogen peroxide flows out from the bottom and returns to the neutralization tank; (4)
Industrial preparation method of hydrogen peroxide III
Hydrogen peroxide with a concentration of 95% can be obtained by electrolyzing 60% sulfuric acid and then hydrolyzing it.