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United States Patent Office 3,372,990 Patented Mar United States Patent Office 3,372,990 Patented Mar. 12, 1968 2 3,372,990 contains an alkali nitrate, or ammonium nitrate and this CYCLIC PROCESS FOR MANUFACTURING Solution is introduced at the inlet of the oxidiser; a second HYDROGEN PEROXDE injection can be made at the outlet of the oxidiser. Michel Charret, Champ-sur-Drac, France, assignor to The process of the invention increases the hydrogen Oxysynthese, Paris, France peroxide production capacity by improving the oxidation No Drawing. Fied Mar. 26, 1965, Ser. No. 443,092 yield and by reducing decomposition of the oxidised phase Claims priority, application France, Apr. 16, 1964, in the oxidiser through stabilisation of this oxidised 971,147, Patent No. 1,405,861 phase. The introduction of disodium phosphate and am 7 Claims. (C. 23-207) monium nitrate into the working solution at the inlet of 0. the oxidiser performs this double role. ABSTRACT OF THE DISCLOSURE It has been found taht injection of an aqueous solution of disodium phosphate and ammonium nitrate into the The present disclosure relates to a process for manu working solution at the outlet of the oxidiser completely facturing hydrogen peroxide by reducing a quinone com inhibited corrosion of the aluminium equipment and pound and oxidizing the resultant hydroquinone com pipelines situated behind the oxidiser. pound, and separating the hydrogen peroxide formed. Furthermore, the process of the invention offers a new The process involves the introduction into the working and equally appreciable advantage in that it reduces the solution of an aqueous solution of an acid pyrophosphate carbon content of the hydrogen peroxide extracted. In of an alkali metal, particularly disodium acid pyrophos deed, it is known that the active oxygen arising from the phate. Preferably, ammonium nitrate is also needed. 20 decomposition of the hydrogen peroxide reacts on the rule" munam solvents to give water-soluble compounds. Stabilisation of either the oxidised organic phase or the hydrogen per This invention concerns an improvement in the oxida oxide leads to a reduction in the carbon content of the tion yield and the inhibition of corrosion of aluminium hydrogen peroxide produced. in the presence of the oxidised phase in the process for 25 The acid pyrophosphate of an alkali metal preferably manufacturing hydrogen peroxide by oxidation and re used is disodium pyrophosphate, P.O.Na2H2. The com duction of quinones. position of the aqueous solution of disodium pyrophos The process which uses anthraquinone for manufacture phate and ammonium nitrate, injected into the working of hydrogen peroxide consists of a cyclic operation com solution, is between 1.5 and 25 g. per litre for disodium prising the hydrogenation, in the presence of a catalyst, of 30 anthraquinones dissolved in solvents, to form anthra pyrophosphate, and between 0.2 and 10 g., per litre for hydroquinones. Then the hydroquinones are oxidised to ammonium nitrate. quinones, with formation of hydrogen peroxide. This This solution is introduced into the organic solution hydrogen peroxide is extracted by washing the oxidised at the inlet of each oxidiser by means of proportioning solution with water. pumps in Such a way that the concentration of products Hydrogenation of the anthraquinone to anthrahydro 35 per m3 of working solution is: quinone also gives rise to side reactions, the principal one 0.15-2.5 g. for disodium pyrophosphate, and being the formation of tetrahydroanthraquinone. 0.02-1 g. for ammonium nitrate. The tetrahydroanthraquinones participate in the hy drogenation reactions and give tetrahydroanthrahydro The second introduction of the stabilising and inhibiting quinones with a hydrogenation rate higher than that of solution is made at the outlet of each oxidiser, in the the anthraquinones and with formation of hydrogen per same proportions as above at the inlet of the oxidisers. oxide by oxidation in air of the tetrahydroanthrahydro The following example illustrates the invention with quinones, the oxidation rate of which is lower than that out restricting it: of the anthrahydroquinones; this is revealed in industrial 45 Example practice by a loss of oxidation efficiency bringing with it a When a working solution containing: decrease in the hydrogen peroxide production capacity of the plant. 50-55% by volume of methyl cyclohexyl acetate, Several processes have been advocated to combat the 45-50% by volume of aromatic hydrocarbons, undesirable influence of the tetrahydroanthraquinones by 11-24 g./I. ethyl anthraquinone, increasing their oxidation rate; for example, French 50 43-61 g/l. tetrahydroethylanthraquinone, and Patent No. 1,240,174, of Oct. 5, 1959, describes a process 21-30 g./l. degradation products characterised in that the oxidation is carried out the presence of a mineral alkaline substance soluble in water, is subjected to hydrogenation, then oxidation by air last German Patent No. 1,144,240 of Aug. 30, 1961, proposes ing between 15 and 35 minutes, the volumes of air intro the addition of phosphoric acid to the working solution 5 5 duced per m.8 oxidised solution being between 25 and in front of the inlet of the oxidiser, American Patent No. 52 m., the hydrogen peroxide content of the organic 3,126,257 of Aug. 2, 1961, proposes the addition of phos solution is 5-9 g. per litre. The oxidation yield is 87%, phoric acid to the extraction water. These processes have and the decomposition of the oxidised phase measured not enabled the hydrogen peroxide yield to be increased between the inlet and the outlet of the oxidisers is 3%. to any very significant extent. 60 in a series of comparative operations carried out under The present invention concerns a more effective im the same working conditions of the solution, that is to provement which brings about simultaneously an increase say for the same flow rate and the same hydrogen peroxide in the hydrogen peroxide production capacity, stabilisa equivalent at hydrogenation, and with the same tempera tion of the oxidised phase, and suppression of the cor ture regime, an aqueous solution containing 5 g. per litre rosion of aluminium equipment in contact with this phase. 65 disodium pyrophosphate (PaONa2H2) and 2 g. per litre This improvement is characterised in that an aqueous ammonium nitrate is introduced into the solution to be solution of an acid pyrophosphate of an alkali metal, treated at the inlet of the oxidiser. This injection is carried preferably disodium pyrophosphate, is introduced into out by means of proportioning pumps, in a quantity such the working solution. that the concentration of the stabilising products perm.8 70 of organic solution is 0.5 g. for the disodium acid pyro According to one preferred implementation of the in phosphate and 0.2g. for the ammonium nitrate. vention, the aqueous solution of disodium pyrophosphate Oxidation of the working solution is carried out under 3,372,990 3 4. the same conditions as in the preceding test. An increase monium nitrate is between about 1.5 and about 25 g. per in the oxidation yield from 87% to 90% is determined, litre for the diisodium pyrophosphate and between about i.e. an improvement of 3%. 0.2 and about 10 g. per litre for the ammonium nitrate. The introduction of the aqueous solution of disodium 3. The process of claim 2 in which the aqueous solution pyrophosphate and ammonium nitrate at the inlet of the of disodium pyrophosphate and ammonium nitrate is in oxidisers also increases the hydrogen peroxide production troduced into the working Solution in such a quantity that capacity by reducing the decomposition of the oxidised the concentration of the disodium pyrophosphate is be phase. This decomposition, measured between the inlet tween about 0.15 and about 2.5 per m.8 and that the and the outlet of the oxidisers, is now only 2%, whereas concentration of the ammonium nitrate is between about it attained 3% in the test involving no introduction of IO 0.02 and about 1 g. per m.8 of working solution. stabiliser solution. 4. A process for manufacturing hydrogen peroxide in This decomposition of the oxidised phase can be reduced an organic working solition which comprises reducing a to 1-1.5% under certain conditions of operation. quinone compound, oxidising the resulting hydroquinone After the oxidation operation, a second injection of the compound, separating the hydrogen peroxide formed and aqueous solution of disodium pyrophosphate and am l introducing into the organic working solution between the monium nitrate is carried out at the outlet of each oxi reducing step and the oxidation step an aqueous solution diser, in the same proportions as previously at the inlet of an acid pyrophosphate of an alkali metal to stabilize of the oxidisers. the resultant reaction products within the oxidizer. Corrosion of the aluminium was extremely serious be 5. A process for manufacturing hydrogen peroxide in fore the introduction of the inhibiting solution. It appeared an organic Working solution which comprises reducing a in the form of rapid pitting of the aluminium. The en quinole compound, oxidising the resulting hydroquinone trained alumina was partly recovered on the filter, which compound, Separating the hydrogen peroxide formed, and became clogged up so quickly that it had to be cleaned introducing into the organic working solution between the every day. The remainder of the alumina caused blocking reducing step and the oxidation step to stabilize the re of the holes in the plates of the extraction columns, making Sultant reaction products within the oxidizer and between it impossible for the latter to operate normally. On several the oxidation step and the separation step to inhibit occasions it was even necessary to stop the operation of downstream corrosion an aqueous solution of an acid the plant in order to clean the plates.
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