System and method for producing hydrogen peroxide through anthraquinone method

Abstract

The invention discloses a system and method for producing hydrogen peroxide through an anthraquinone method. The system comprises the four unit processes of hydrogen dissolving, hydrogenation, oxidation and extraction, wherein a hydrogenation unit comprises a series fixed bed and upflow-type tubular reactors, and working liquid and hydrogen are subjected to a hydrogenation reaction in the hydrogenation unit to obtain hydrogenation liquid; an oxidation unit comprises an oxidation tower, the hydrogenation liquid and oxygen-containing gas are subjected to an automatic oxidation reaction to obtainoxidation liquid; and an extraction unit comprises an extraction tower, hydrogen peroxide in the oxidation liquid is extracted by the water, and thus a high-concentration hydrogen peroxide product isobtained. According to the system and method, the anthraquinone hydrogenation reaction rate can be significantly improved, the anthraquinone hydrogenation reaction efficiency can be significantly improved, the uniformity of the reaction process is maintained, side reactions are less, the obtained hydrogenation liquid is good in quality, small in by-product number and low in viscosity, the gas-liquid mass transfer rate in the oxidation process is increased, the extraction efficiency in the extraction process is improved, the oxidation time is significantly shortened, and the number of actual tower plates of the extraction tower is decreased.

Description

technical field [0001] The invention belongs to a hydrogen peroxide production process, in particular to a system for producing hydrogen peroxide by an anthraquinone method and a method for producing hydrogen peroxide by an anthraquinone method. Background technique [0002] At present, the main method for producing hydrogen peroxide in industry is the anthraquinone method. Anthraquinone fixed-bed hydrogen peroxide production process uses 2-ethylanthraquinone as the working carrier, aromatic hydrocarbon, trioctyl phosphate or 2-methylcyclohexyl acetate as the solvent, and is formulated into a working solution in a certain proportion. In the fixed bed, under the catalysis of a certain temperature, pressure and palladium catalyst, the hydrogenation reaction is carried out with hydrogen, and the hydrogenated liquid is then oxidized with oxygen in the air, and the obtained oxidized liquid is extracted and purified by pure water to obtain the finished product Hydrogen peroxide a...

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Problems solved by technology

The fixed-bed hydrogenation reactor in the anthraquinone hydrogenation process has the following problems: (1) The dispersion state of hydrogen in the working fluid is unstable. It is easy to diffuse upward and escape to the top of the reactor, and accumulate in the top space of the reactor. On the one hand, the hydrogenation reaction efficiency is reduced, and the ideal hydrogenation effect cannot be achieved. On the other hand, the gas phase space at the top of the reactor is hydrogen and hydrocarbon vapor. In addition, the distribution of hydrogen is more up than down, resulting in more reactions concentrated on the upper part of the catalyst bed, so that the upper part of the catalyst bed is prone to excessive hydrogenation reaction and the lower part of the bed is not fully reacted; ( 2) In the process of anthraquinone hydrogenation reaction, in order to ensure the reaction pressure and control the discharge of tail gas, the long-term hydrogenation reaction will form the accumulation of inert gas, which will reduce the partial pressure of hydrogen, thereby inhibiting the reactivity, and a large amount of tail gas will be released Exhaust will solve this problem, but it will cause a waste of hydrogen resources; (3) During the hydrogenation of anthraquinone, hydrogen is in the continuous phase, and the working fluid is in the dispersed phase, so there will be uneven distribution of the working fluid on the surface of the catalyst , Locally more liquid areas and less liquid areas, so that the hydrogenation process is very uneven, there are areas of insufficient hydrogenation of anthraquinone and excess hydrogenation, when the hydrogenation of anthraquinone is insufficient, the reaction efficiency will be reduced, and when the hydrogenation is excessive, more side reactions will occur

The above method increases the reaction rate by changing the oxidation mass transfer of the oxidation unit, but in this method, micron-sized bubbles grow quickly, the tail oxygen content is high, the number of microreactors is large, the investment is high, and hydroanthraquinone is easy to precipitate And many problems such as clogging of microreactors

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