Oxidation-extraction technology for production of hydrogen peroxide by anthraquinone process

Abstract

The invention discloses an oxidation-extraction technology for production of hydrogen peroxide by anthraquinone process. The oxidation-extraction technology for production of hydrogen peroxide by anthraquinone process comprises the following contents: (1) introducing hydrogenation liquid and oxygen-containing gas from the bottom of an oxidation-extraction reactor to carry out concurrent-flow oxidation reaction from the bottom to the top inside the reactor so as to continuously generate H2O2; (2) introducing an extraction agent through the upper middle part of the oxidation-extraction reactor while the reaction in the step (1) is carried out, letting the extraction agent flow from the top to the bottom in the reactor, and gradually extracting out the H2O2 generated by the oxidation reaction; and (3) carrying out gas-liquid separation on the material from the bottom to the top, removing residual moisture with a working solution and flowing out, settling the material from the top to the bottom in the settling section, removing the residual working solution in water, and purifying or concentrating to obtain a hydrogen peroxide product. According to the technology, the two processes of oxidation and extraction are coupled to each other. The oxidation reaction is carried out while extraction of H2O2 is conducted. Meanwhile, oxidation reaction rate and extraction efficiency are enhanced, the technological process is simplified, and the technology is beneficial to save investments and reduce energy consumption.

Description

technical field [0001] The invention relates to an oxidation-extraction process for producing hydrogen peroxide by an anthraquinone method. Background technique [0002] At present, the methods for producing hydrogen peroxide by anthraquinone method in domestic industry include suspension nickel catalyst technology, fixed bed palladium catalyst technology, fluidized bed technology, etc., wherein the fixed bed palladium catalyst technology of anthraquinone method is because of its low investment, high output and easy operation. Simple and the palladium catalyst used has the advantages of less consumption, high activity, easy regeneration and safe use, and has become the mainstream of domestic hydrogen peroxide production technology. Anthraquinone method fixed-bed palladium catalyst technology: use 2-ethylanthraquinone as the carrier, and use aromatic hydrocarbon and trioctyl phosphate as the solvent to prepare a mixed liquid working fluid. The working fluid is hydrogenated w...

AI Technical Summary

Problems solved by technology

[0003] In the whole production process of hydrogen peroxide, the oxidation process of hydroanthraquinone is an automatic oxidation reaction between air and hydrogenated liquid in the oxidation reactor. The reaction process is carried out between the hydrogenated liquid and a large amount of air. During the gas-liquid reaction, Due to the high resistance of the gas-liquid two-phase interface, and the reaction process uses oxygen in the air, which only accounts for 21%, resulting in low reaction rate, long reaction time, decomposition of hydrogen peroxide, and low oxidation yield in the oxidation process. , serious side reactions and other adverse effects, so how to increase the oxidation reaction rate and reduce the oxidation time is of great significance to improve the production efficiency of hydrogen peroxide

[0004] The existing oxidation tower for the production of hydrogen peroxide by the anthraquinone method is generally divided into two sections, the upper section and the lower section. There is an apparent series process between the two section towers. The air reacts with the oxidized liquid reacted in the upper tower. In each tower, the hydrogenated liquid and air enter from the bottom of the tower and flow upward to gradually undergo oxidation reaction. There are several problems in this process: (1) As the oxidation reaction proceeds, the concentration of hydrogen peroxide produced is getting higher and higher, that is, the density of the material in the oxidation tower is increasing from bottom to top, so that the material will increase the tendency of back-mixing due to gravity, thereby reducing the oxidation yield; (2 ) Due to the high density of the back-mixed hydrogen peroxide during the reaction process, it accumulates at the bottom of the oxidation tower and becomes an oxidation raffinate, thereby further reducing the oxidation yield; (3) Due to the continuous generation of hydrogen peroxide during the oxidation reaction, hydrogen peroxide The phase dissolves in the hydrogenation / oxidation solution, thereby reducing the rate of the oxidation reaction

Although this method improves the mass transfer of the dispersed phase and the continuous phase to a certain extent, and the number of trays has a certain amount of reduction, but after adding the injection gas, the tower equipment changes from normal pressure to band pressure, and the wall of the tower equipment Thickness and pressure levels are also increased accordingly, and there is no significant advantage in equipment investment

Images