Abstract: A device comprising a measuring device for determining the flow rate of a water stream, a measuring device for determining the concentration of hydrogen peroxide in the water stream, a measuring device for determining the concentration of peracetic acid in the water stream, a metering device for metering a reducing agent into the water stream downstream of the measuring devices for the concentrations, and a control device which, from the flow rate of the water stream, the concentration of hydrogen peroxide in the water stream and the concentration of peracetic acid in the water stream, calculates an amount of reducing agent for reducing the content of hydrogen peroxide and peracetic acid to a desired value and actuates the metering device for metering the reducing agent, makes possible reliable reduction of the content of hydrogen peroxide and peracetic acid in a water stream.

Abstract: A method for producing 2-(4-methyl-3-pentenyl)anthraquinone (IHEAQ) that includes a Diels-Alder addition of naphtho-1,4-quinone and myrcene and an oxidation of the resulting adduct. The oxidation step is carried out in the presence of a solvent mixture that contains a polar and a nonpolar solvent. The oxidation takes place with air or an O2-containing gas in the presence of a combination of a strong inorganic base and an organic, especially a nitrogen-containing base. The method leads to a higher space-time yield and higher product purity.

Abstract: A method for producing 2-(4-methyl-3-pentenyl)anthraquinone (IHEAQ) that includes a Diels-Alder addition of naphtho-1,4-quinone and myrcene and an oxidation of the resulting adduct. The oxidation step is carried out in the presence of a solvent mixture that contains a polar and a nonpolar solvent. The oxidation takes place with air or an O2-containing gas in the presence of a combination of a strong inorganic base and an organic, especially a nitrogen-containing base. The method leads to a higher space-time yield and higher product purity.

Abstract: A cyclic anthraquinone process for producing hydrogen peroxide using at least two differently substituted 2-alkylanthraquinones and/or their tetrahydro derivatives. The working solution to be used contains (i) at least one reaction carrier from the series 2-(4-methyl-3-pentenyl) anthraquinone (IHEAQ), 2-(4-methylpentyl) anthraquinone (IHAQ) and their di- and tetrahydro derivatives such as, in particular 2-(4-methylpentyl)-&bgr;-tetrahydroanthraquinone (THIHAQ), and (ii) at least one reaction carrier from the series of the 2-(C1- to C5)-alkylanthraquinones, especially 2-ethylanthraquinone (EAQ), and their tetrahydro derivatives. The reaction carriers according to (i) make up 5 to 95 molar %, especially 20 to 50 molar % of all reaction carrier. The method is distinguished by greater H2O2 capacity, improved hydrogenation kinetics and lesser susceptibility to disturbances. A method for making THIHAQ is also disclosed.

Abstract: A cyclic anthraquinone process for producing hydrogen peroxide using at least two differently substituted 2-alkylanthraquinones and/or their tetrahydro derivatives. The working solution to be used contains (i) at least one reaction carrier from the series 2-(4-methyl-3-pentenyl) anthraquinone (IHEAQ), 2-(4-methylpentyl) anthraquinone (IHAQ) and their di- and tetrahydro derivatives such as, in particular 2-(4-methylpentyl)-.beta.-tetrahydroanthraquinone (THIHAQ), and (ii) at least one reaction carrier from the series of the 2-(C.sub.1 - to C.sub.5)-alkylanthraquinones, especially 2-ethylanthraquinone (EAQ), and their tetrahydro derivatives. The reaction carriers according to (i) make up 5 to 95 molar %, especially 20 to 50 molar % of all reaction carriers. The method is distinguished by greater H.sub.2 O.sub.2 capacity, improved hydrogenation kinetics and lesser susceptibility to disturbances. A method for making THIHAQ is also disclosed.