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US 6,649,140 B2Granted
Process for the continuous production of hydrogen peroxide
AssigneesENI S.p.A., Enichem S.p.A.
InventorsGiuseppe Paparatto, Franco Rivetti, Pietro Andrigo, Giordano De Alberti
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Abstract
A process is described for the continuous production of alcoholic or hydro-alcoholic solutions of hydrogen peroxide in a concentration ranging from 2 to 10% by weight and their direct use in oxidation processes. The process operates under high safety conditions and with a high productivity and molar selectivity towards the formation of H2O2.
Claims40
A process for the continuous production of alcoholic or hydro-alcoholic solutions having more than 50% by weight of at least one alcohol, of hydrogen peroxide, which comprises:
- (a) feeding to a reactor, which comprises a catalyst comprising palladium and platinum metals, heterogeneous and maintained in dispersion in a liquid reaction medium:
- (i) a liquid stream comprising an alcohol or an alcohol-water mixture, having more than 50% by weight of at least one alcohol, an acid promoter, and a halogenated promoter wherein the concentration of acid promoter is from 20 to 1000 mg per kg of solution and the concentration of the halogenated promoter is from 1-10 mg per kg of solution;
- (ii) a gaseous stream of hydrogen, oxygen and an inert gas, wherein the concentration of hydrogen is lower than 4.5% by volume and the concentration of oxygen is lower than 21% by volume, the remainder being the inert gas;
- (b) removing from the reactor:
- (iii) a liquid stream comprising stream (i), hydrogen peroxide and water produced by reaction, wherein the concentration of hydrogen peroxide ranges from 2% to 10% by weight;
- and
- (iv) a gaseous stream comprising hydrogen, oxygen and the inert gas.
4 more elements
Dependencies are inferred from the claim text.