SU736535A1 - Process of obtaining hydrogen peroxide by anthraquinone method - Google Patents

Abstract

1. METHOD FOR OBTAINING HYDROGEN PEROXIDE BY ANTHRAHINON METHOD by catalytic hydrogenation of a mixture of alkyl anthraquinones and their tetrahydro derivatives dissolved in an organic solvent consisting of aromatic hydrocarbons and higher fatty alcohols-octanol-2 ,. followed by oxidation of the hydrogenation products, removal of hydrogen peroxide and return of the anthraquinone solution to the hydrogenation stage, characterized in that, in order to reduce the explosiveness and increase the oxidation rate, pseudohumol and / or mesitylene are used as aromatic hydrocarbons and hydro products. 2; A method according to claim 1, which is also distinguished by the fact that the ratio of pseudocumene and / or mesitylene to octanol-2 iS is equal to 1:

Description

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The invention relates to the field of producing hydrogen peroxide by the anthraquinone method.

The anthraquinone method of hydrogen peroxide production is catalyzed by the catalytic hydrogenation of the working solution-mixture of alkyl anthraquinones and their tetrahydro derivatives dissolved in a mixture of organic solvents, followed by oxidation of the hydrogenation products, separation of the hydrogen peroxide formed and returning the working solution to the hydrogenation stage. Working solutions usually contain a mixture of 1.5 solvents consisting of a component for dissolving alkyl-anthraquinones and a component for dissolving their hydroproducts, alkyl anthrahydroquinones.

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A known method for producing hydrogen peroxide is in which to dissolve alkyl anthraquinones. a mixture of aromatic hydrocarbons, higher aliphatic, alcohols and esters is used.

There is also known a method for producing hydrogen peroxide using a mixture of solvents isoamyl anthraquinone and tetrahydroiso amyl anthraquinone, consisting of aromatic hydrocarbon-xylene and octanol-2,

The disadvantages of using such solvents are the explosiveness and comparatively low oxidation rate of alkyl anthrahydroquinone to alkyl anthraquinone 35 with the formation of hydrogen peroxide.

 The explosion hazard is due to the low temperature limit of ignition of the vapors of the solvent mixture with air, which lies from –37 to –70 ° C and does not allow to increase the temperature regime of the technological process itself, which intensifies to a significant extent, due to the concentration of alkyl anthraquinones, and therefore an increase in the removal of hydrogen peroxide.

The rate of oxidation of anthrahydroquin-50s at 50 ° C, based on the amount of hydrogen peroxide formed in the known process, is 0.85 - 1.85 g l / min, depending on the degree of hydrogenation of the alkyl-55 anthraquinones of the starting mixture.

The purpose of the invention is to reduce the explosion hazard of the process of obtaining

hydrogen peroxide and an increased oxidation rate.

The goal is achieved by using the composition in which the aromatic hydrocarbon HioioB and their tetrahydro derivatives are a composition in which the aromatic hydrocarbon is psevokumol or mesitylene or their mixture, and the secondary aliphatic alcohol is octanol-2, with respect to aromatic, hydrocarbon to octanol-2 1 : (1-1.5).

These solvent mixtures have the same dissolving ability with respect to the derivatives of alkyl-anthraquinones and alkyl-anthrahydroquinones as the mixture of xylene with octanol-2, but have a higher lower temperature limit of vapor ignition - 54 - 58 ° C and higher oxidation rates.

Example 1. A working solution consisting of 1.25 mol / l of a mixture of 2-isoamyl- and tetrahydro-2-isoamylanthraquinones dissolved in pseudocumene and octanol-2 (1: 1 by volume) is hydrogenated by a known technique to a content of hydro products corresponding to Removing hydrogen peroxide 12.6 g / l and oxygenate at 50 ° C. The rate of hydrogen peroxide formation (oxidation rate) is 1.33 g 02 l / min.

Example 2. The working solution of the composition of Example 1 is hydrogenated to a content of hydro products corresponding to the removal of hydrogen peroxide, 14.45 g / l and oxidized with oxygen at. The rate of formation of hydrogen peroxide (oxidation rate) 1.46 g and O p / min,

Example The working solution of the composition specified in example 1 is hydrogenated to a content of hydro products corresponding to the removal of hydrogen peroxide of 22.6 g / l and oxidized with oxygen at 50 ° C. The average rate of formation of hydrogen peroxide is 2.06 g of H2O2 / MIN.

EXAMPLE 4 A working solution consisting of 1.25 mol / l of a mixture of 2-isoamyl and tetrahydro-2-isoamyl-anthraquinones, dissolved in pseudocumene and octanol-2 (2: 3 by volume), is hydrogenated. to the content of the byproducts corresponding to the removal of hydrogen peroxide of 22.6 g / l and oxidized with oxygen at 50 ° C. The average rate of formation of hydrogen peroxide is 2.2 g of HjOj l / min. EXAMPLE 5 A working solution consisting of 1.25 mol / l of a mixture containing 2-isoamyl- and tetrahydroiso-amyl anthraquinones dissolved in a mixture of pseudocumolactanol-2 solvents (3: 2 by volume) is hydrogenated in a known manner to contain hydro products corresponding to the removal of hydrogen peroxide of 22.4 g / l are oxidized by oxygen at 50 ° C. The average oxidation rate (formation of hydrogen peroxide) is 1.93 g H202 l / m. -. . The oxidation rate of the working plant. 54 In table. Table 1 shows comparative data on the rate of formation of hydrogen peroxide (oxidation rate) obtained in the known and proposed methods. From a comparison of data, namely, the rate of oxidation (rate of formation of hydrogen peroxide) obtained in the implementation of the known and proposed methods, it follows that the oxidation rate of hydro products increases 1.25-1.5 times compared with the known. ; . depending on the composition of the solution. . .

By a known method 1. Xylene-octanol-2

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According to the proposed method

7. Pseudocumen-octanol-2

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11. Pseudocumene-octanol-2

12. Pseudocumene-octanol-2

13. Mesitylene-octanol-2

14. Mesitylene-octanol-2

1.5. Mesitylene-octanol-2

16. Mesitylene pseudocoumol octanol 17. Mesitylene pseudocumene octanol Continuation of table

18.5 1.25. 1.55

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22.0 1.25

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26.4 1.25 2.04

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21.4, 1.25: 1.82

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29.3 1.25. 2.3

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Claims (2)

1. METHOD FOR PRODUCING HYDROGEN PEROXIDE BY ANTRAHINONIC METHOD by catalytic hydrogenation of a mixture of alkylanthraquinones and their tetrahydro derivatives, dissolved in an organic solvent consisting of aromatic hydrocarbons and higher fatty alcohols.-Octanol-2. followed by oxidation of the hydrogenation products, the release of hydrogen peroxide and the return of the anthraquinone solution to the hydrogenation stage, characterized in that, in order to reduce the risk of explosion and increase the oxidation rate, pseudobcumol and / or mesitylene is used as an aromatic hydrocarbon in a ratio that ensures the dissolution of alkylanthraquinones and their hydro products . 2; A method according to claim 1, characterized in that the ratio of pseudocumene and / or mesitylene to octanol-2 is maintained equal to 1: (1-1.5). * 4 Оο O) SP ω sd »736535