Patent ID: 8158100

Claim:
A method for preparation of hydrogen peroxide through an anthraquinone recycle process of reducing and oxidizing a working solution comprising 2-alkylanthraquinone, 2-tetrahydroalkylanthraquinone and an organic solvent, wherein 65-95 mol % of the alkyl group of 2-alkylanthraquinone and 2-tetrahydroalkylanthraquinone is amyl and the remaining 5-35 mol % of the alkyl group is ethyl, and the molar ratio of 2-alkylanthraquinone to 2-tetrahydroalkylanthraquinone is from 4:6 to 1:9, wherein inert ingredients produced from the side reaction of 2-alkylanthraquinone are included in the working solution in an amount of 3-20 wt %.