In a cyclic anthraquinone process for producing hydrogen peroxide, which comprises a distillation unit with vapor compression for concentrating hydrogen peroxide, aqueous condensate from the distillation unit is passed over a bed of a cation exchange resin in its protonated from to provide a purified condensate, and the purified condensate is used as extractant for extracting hydrogen peroxide in the anthraquinone process, as column reflux for the distillation unit or as a diluent for diluting an aqueous hydrogen peroxide solution.

In a cyclic anthraquinone process for producing hydrogen peroxide, which comprises a distillation unit with vapor compression for concentrating hydrogen peroxide, aqueous condensate from the distillation unit is passed over a bed of a cation exchange resin in its protonated from to provide a purified condensate, and the purified condensate is used as extractant for extracting hydrogen peroxide in the anthraquinone process, as column reflux for the distillation unit or as a diluent for diluting an aqueous hydrogen peroxide solution.

Process for manufacturing an aqueous hydrogen peroxide solution comprising the following steps: hydrogenating a working solution which comprises an alkylanthraquinone and/or tetrahydroalkylanthraquinone and a mixture of a non-polar organic solvent and a polar organic solvent wherein the concentration of non-polar organic solvent in said mixture is equal to or higher than 30 wt %; oxidizing the hydrogenated working solution to produce hydrogen peroxide; andisolating the hydrogen peroxide, wherein the polar organic solvent is a substituted cyclohexane carbonitrile.

Process for manufacturing an aqueous hydrogen peroxide solution comprising the following steps: hydrogenating a working solution which comprises an alkylanthraquinone and/or tetrahydroalkylanthraquinone and a mixture of a non-polar organic solvent and a polar organic solvent wherein the concentration of non-polar organic solvent in said mixture is equal to or higher than 30 wt %; oxidizing the hydrogenated working solution to produce hydrogen peroxide; andisolating the hydrogen peroxide, wherein the polar organic solvent is a substituted cyclohexane carbonitrile.

A process and a facility for making hydrogen peroxide using the anthraquinone process can be performed. At least one steam turbine drives at least one rotating equipment and provides a steam flow with a pressure range of ?0.8 barg to 3 barg and a temperature range of 60 to 185? C. to an evaporator used in a distillation unit for concentrating an aqueous hydrogen peroxide extract.

A process and a facility for making hydrogen peroxide using the anthraquinone process can be performed. At least one steam turbine drives at least one rotating equipment and provides a steam flow with a pressure range of ?0.8 barg to 3 barg and a temperature range of 60 to 185? C. to an evaporator used in a distillation unit for concentrating an aqueous hydrogen peroxide extract.

The present invention relates to a process for the production of hydrogen peroxide by the cyclic Auto-Oxydation-process comprising the two alternate steps of: hydrogenation of a working solution in the presence of a catalyst, wherein said working solution contains at least one quinone dissolved in at least one organic solvent, to obtain at least one corresponding hydroquinone; and oxidation of said at least one hydroquinone; characterized in that the organic solvent has the formula (I):

##STR00001##

wherein R.sup.1 is an aryl group comprising from 6 to 18 carbon atoms and R.sup.2 is an alkyl group comprising from 1 to 8 carbon atoms, when R.sup.2 is a methyl group, R.sup.1 is different from phenyl.

The present invention relates to a process for the production of hydrogen peroxide by the cyclic Auto-Oxydation-process comprising the two alternate steps of: hydrogenation of a working solution in the presence of a catalyst, wherein said working solution contains at least one quinone dissolved in at least one organic solvent, to obtain at least one corresponding hydroquinone; and oxidation of said at least one hydroquinone; characterized in that the organic solvent has the formula (I):

##STR00001##

wherein R.sup.1 is an aryl group comprising from 6 to 18 carbon atoms and R.sup.2 is an alkyl group comprising from 1 to 8 carbon atoms, when R.sup.2 is a methyl group, R.sup.1 is different from phenyl.

A composition comprising a compound of formula (Va) wherein n is 1 or 2 and wherein m is 1 or 2, with n and m preferably both being 1 or both being 2, more preferably both being 1, and/or, preferably and, a compound of formula, wherein n is 1 or 2 and wherein m is 1 or 2, with n and m preferably both being 1 or both being 2, more preferably both being 1, and wherein at least 90 weight-% of the composition consist of compounds of formula (Va) and formula (Vb). ##STR00001##

A composition comprising a compound of formula (Va) wherein n is 1 or 2 and wherein m is 1 or 2, with n and m preferably both being 1 or both being 2, more preferably both being 1, and/or, preferably and, a compound of formula, wherein n is 1 or 2 and wherein m is 1 or 2, with n and m preferably both being 1 or both being 2, more preferably both being 1, and wherein at least 90 weight-% of the composition consist of compounds of formula (Va) and formula (Vb). ##STR00001##