Patent ID: 7425316

Claim:
Composition useful as a working solution at production of hydrogen peroxide with the anthraquinone process comprising one or more quinones selected from the group consisting of anthraquinones and tetrahydro anthraquinones, dissolved in at least one quinone solvent and at least one hydroquinone solvent, wherein said at least one quinone solvent comprises isodurene in an amount from 15 to 100 wt % of total amount of quinone solvents and, additionally, durene in an amount not exceeding about 25 wt % of total amount of quinone solvents, the total amount of isodurene and durene constitutes from about 30 to about 100 wt % of the quinone solvents, and further wherein the weight ratio isodurene to durene in the working solution is from about 1.5:1 to about 5:1.