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The invention concerns a process for production of hydrogen peroxide according to the anthraquinone process comprising the steps of alternate hydrogenation and oxidation of anthraquinones and tetrahydro anthraquinones in a working solution comprising a mixture of alkyl-substituted anthraquinones and

The invention concerns a process for production of hydrogen peroxide according to the anthraquinone process comprising the steps of alternate hydrogenation and oxidation of anthraquinones and tetrahydro anthraquinones in a working solution comprising a mixture of alkyl-substituted anthraquinones and alkyl-substituted tetrahydro anthraquinones dissolved in at least one organic solvent, wherein from 10 to 55 mole % of the anthraquinones and the tetrahydro anthraquinones are substituted with one amyl group, and the molar ratio of alkyl-substituted tetrahydro anthraquinones to alkyl-substituted anthraquinones is at least 1:1. The invention also concerns a composition useful as a working solution in said process.

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1. A process for production of hydrogen peroxide according to the anthraquinone process comprising the steps of alternate hydrogenation and oxidation of anthraquinones and tetrahydro anthrequinones in a working solution, characterised in that the working solution to be hydrogenated comprises a mixtu

1. A process for production of hydrogen peroxide according to the anthraquinone process comprising the steps of alternate hydrogenation and oxidation of anthraquinones and tetrahydro anthrequinones in a working solution, characterised in that the working solution to be hydrogenated comprises a mixture of alkyl-substituted anthraquinones and alkyl-substituted tetrahydro anthraquinones dissolved in at least one organic solvent, wherein from 10 to 55 mole % of the anthraquinones and the tetrahydro anthraquinones are substituted with one amyl group, and the molar ratio of alkyl-substituted tetrahydro anthraquinones to alkyl-substituted anthraquinones is at least 3:1. 2. A process as claimed in claim 1, wherein the molar ratio of alkyl-substituted tetrahydro anthraquinones to alkyl-substituted anthraquinones is from about 3:1 to about 50:1. 3. A process as claimed in claim 1, wherein from 45 to 90 mole % of the anthraquinones and tetrahydro anthraquinones are substituted with one ethyl group. 4. A process as claimed in claim 1, wherein from 55 to 80 mole % of the anthraquinones and tetrahydro anthraquinones are substituted with one ethyl group. 5. A process as claimed in claim 1, wherein the working solution to be hydrogenated is substantially free from unsubstituted anthraquinone and tetrahydro anthraquinone. 6. A process as claimed in claim 1, wherein the at least one organic solvent comprises one or more quinone solvents, and one or more hydroquinone solvents selected from the group consisting of alkyl phosphates, tetraalkyl ureas, cyclic urea derivatives and alkyl-substituted caprolactams. 7. A process as claimed in claim 1, wherein the hydrogenation step is performed to a degree from 350 to 800 moles hydroquinones per m3working solution. 8. A composition comprising a mixture of alkyl substituted anthraquinones and alkyl-substituted tetrahydro anthraquinones dissolved in at least one organic solvent, characterised in that from 10 to 55 mole % of the anthraquinones and the tetrahydro anthraquinones are substituted with one amyl group, and that the molar ratio of alkyl-substituted tetrahydro anthraquinones to alkyl-substituted anthraquinones is at least 3:1. 9. A composition as claimed in claim 8, wherein the composition is substantially free from unsubstituted anthraquinone and tetrahydro anthraquinone. 10. A composition as claimed in claim 8, wherein the composition comprises from 55 to 80 mole % of anthraquinones and tetrahydro anthraquinones substituted with one ethyl group.