Hydrogen peroxide extraction process

Abstract

The invention discloses a hydrogen peroxide extraction process which comprises the following contents: countercurrent extraction separation of oxidized liquid is carried out in an extraction column, wherein the oxidized liquid is obtained in a hydrogen peroxide production process by an anthraquinone method; the extraction column is a plate column, and an operating fluid extraction pipeline is disposed below at least one column plate; the extracted operating fluid is circulated to the lower part of the extraction column, and is subjected to extraction separation with the oxidized liquid. The process has the advantages of good extraction effect, large adjustable range of device load, stable operation, no liability to material deposition, and suitability for industrial application.

Description

technical field [0001] The invention relates to a hydrogen peroxide extraction process, in particular to a hydrogen peroxide extraction process for improving the extraction effect. Background technique [0002] Hydrogen peroxide ( H 2 o 2 Aqueous solution) is an important inorganic chemical product. Because the final product after its application is water and oxygen, it has no pollution to the environment, so it is called a green chemical product and is widely used. At present, the industrial production of hydrogen peroxide in the world mainly adopts the anthraquinone method. The process of producing hydrogen peroxide by the anthraquinone method uses 2-ethylanthraquinone (EAQ) as the working carrier, and heavy aromatics (Ar) and trioctyl phosphate (TOP) as the solvent. It is made into a working solution and undergoes several processes of hydrogenation, oxidation, extraction and post-treatment of the working solution. [0003] The extraction process occupies a pivotal posi...

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Problems solved by technology

[0004] At present, the effect of the existing hydrogen peroxide extraction process is not particularly ideal, and there are several problems in operation: (1) It is difficult to grasp the opening area of ​​the sieve plate. If the opening area is large, the dispersed phase working liquid will pass through the sieve plate When the perforation rate is low, the mass transfer rate of the two phases is low, and the extraction effect is not ideal; if the opening area is small, it will easily cause the extraction tower to accumulate material, and the device cannot be operated; (2) due to the weight of the upper, middle and lower parts of the extraction tower The difference in specific gravity between the two phases will result in a difference in the driving force for mass transfer. The difference in specific gravity between the light and heavy phases at the bottom of the extraction tower is the largest, and the driving force is the largest. According to theoretical analysis, the flow rate of the working liquid in the upper part of the extraction tower passing through the sieve hole is smaller, while the flow rate of the working liquid in the lower part through the sieve hole is larger, which requires that the opening area of ​​the lower part of the extraction tower is smaller, while the upper part is larger. The opening area is larger, but in fact, many manufacturers only set two specifications for the sieve plate of the extraction tower, one for the upper part and one for the lower part. (3) During normal extraction operation, due to the thick liquid layer under the sieve plate on the upper part of the extraction tower and the high viscosity of the working fluid, it is easy to produce material accumulation in the extraction tower, which will affect the normal operation of the device; (4) The operating flexibility of the device is small. When the operating load changes, since the perforation flow rate of the working fluid in the extraction tower has an optimal effect range, when the flow rate of the working fluid changes, the flow rate in the extraction tower will change, which will affect the two-phase mass transfer. speed, making the extraction effect worse

However, since the sieve plates of the extraction tower in the prior art generally have about 50 to 60 layers, when the opening area increases layer by layer from bottom to top, because the difference between the upper and lower plates is too small, there are certain difficulties in industrial realization.

In addition, this method does not fundamentally solve the problems of unsatisfactory extraction effect and material accumulation when the operating load of the device changes.

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