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Method for preparing hydrogen peroxide through anthraquinone technology

A technology of hydrogen peroxide, anthraquinone method, applied in chemical instruments and methods, peroxide/peroxyhydrate/peroxyacid/superoxide/ozone, inorganic chemistry, etc., can solve the limitation of hydrogen peroxide The problems of the highest concentration, low hydrogen peroxide production capacity, and large amount of tetrabutylurea can achieve the effects of improving the conversion rate of hydrogenation reaction, reducing the amount of organic carbon and large distribution coefficient

Inactive Publication Date: 2016-08-03
WUHAN YOULIKE NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this two-component solvent system is: the solubility of anthraquinone and hydroanthraquinone is low, generally about 120-130g / L, which is not conducive to improving the hydrogen efficiency, and the production capacity of hydrogen peroxide is relatively low, and it also limits the extraction. Maximum concentration of hydrogen peroxide in the process
The advantage of this process is that the density of the working liquid is moderate, the solubility to the working carrier is high, and the boiling point of the solvent is high. The disadvantage is that the consumption of tetrabutylurea is large, the price is expensive, and the market is in short supply.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A mixed solvent system was prepared by using 70L of trimethylbenzene, 15L of trioctyl phosphate, 10L of 2-methylcyclohexyl acetate and 5L of tetrabutylurea. At room temperature, the solubility of 2-ethylanthraquinone and tetrahydro-2-ethylanthraquinone is 155g / L. Using Pd-Al 2 o 3 catalyst. The hydrogenation reaction temperature is 45°C, the pressure is 0.2MPaG, and the working fluid space velocity is 10h -1 , The volume flow ratio of working fluid to hydrogen is 1:8.5 (standard state). The oxidation reaction temperature is 45°C and the pressure is 0.3MPaG. The measured hydrogenation efficiency is 12.5gH 2 o 2 / L, the product concentration is 36%, and the density of the working solution is 0.931g / ml at 45°C.

Embodiment 2

[0028] Same as Example 1, except that the composition of the working solution is changed to: solvent: trimethylbenzene 70L, trioctyl phosphate 15L, 2-methylcyclohexyl acetate 5L, tetrabutylurea 10L; working carrier: 2-ethylanthraquinone The solubility and tetrahydro-2-ethylanthraquinone concentration were 168 g / L. Using Pd-SiO 2 catalyst. The hydrogenation reaction temperature is 45°C, the pressure is 0.2MPaG, and the working fluid space velocity is 15h -1 , The volume flow ratio of working fluid to hydrogen is 1:9.5 (standard state). The oxidation reaction temperature is 45°C and the pressure is 0.3MPaG. The measured hydrogenation efficiency is 13.2gH 2 o 2 / L, the product concentration is 38%, and the density of the working solution is 0.923g / ml at 45°C.

Embodiment 3

[0030] Same as Example 1, except that the composition of the working solution is changed to: solvent: trimethylbenzene 65L, trioctyl phosphate 15L, 2-methylcyclohexyl acetate 10L, tetrabutylurea 10L; working carrier: 2-ethylanthraquinone And the total concentration of tetrahydro-2-ethylanthraquinone is 175g / L. Using Pd-Al 2 o 3 catalyst. The hydrogenation reaction temperature is 50°C, the pressure is 0.2MPaG, and the working fluid space velocity is 10h -1 , The volume flow ratio of working fluid to hydrogen is 1:10 (standard state). The oxidation reaction temperature is 45°C and the pressure is 0.3MPaG. The measured hydrogenation efficiency is 14.5gH 2 o 2 / L, the product concentration is 42%, and the density of the working fluid is 0.926g / ml when measured at 50°C.

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Abstract

The invention discloses a method for preparing hydrogen peroxide through an anthraquinone technology. The method comprises the steps of a palladium catalyst fixed bed hydrogenation reaction, an air bubbling oxidation reaction, extraction and purification; the solvent of a working liquid comprises, by volume, 60-80% of trimethylbenzene, 0.5-25% of trioctyl phosphate, 0.5-25% of tetrabutyl urea, and 0.5-25% of 2-methylcyclohexyl acetate; and the reaction carrier in the working liquid is a 2-ethylanthraquinone and tetrahydro-2-ethylanthraquinone mixture, and the total content is 140-200g / L. The solubility of the reaction carrier in the solvent is large, and the concentration can reach 140-200g / L, so the conversion rate of the hydrogenation reaction is improved, and the hydrogen efficiency can reach 12-15g / L, thereby the productivity is improved; the density of the working liquid is lower than that of present working liquid systems, a difference between the density of the working liquid and the density of water is large, and the distribution coefficient of hydrogen peroxide in the extraction process is large, so extraction is facilitated, the concentration of hydrogen peroxide in a product is improved, and hydrogen peroxide with the content of 35-45% (wt) can be directly obtained through extraction; and the energy consumption and the material consumption of a device are reduced.

Description

technical field [0001] The invention relates to a method for preparing hydrogen peroxide by an anthraquinone method, in particular to an anthraquinone method using trimethylbenzene, trioctyl phosphate, tetrabutylurea and 2-methylcyclohexyl acetate as solvents. Process for the preparation of hydrogen peroxide. Background technique [0002] Hydrogen peroxide is an important industrial raw material, which can be used as oxidizing agent, bleaching agent, disinfectant and dechlorination agent, and can also be used as rocket fuel, oxidation reaction raw material in chemical production, foam plastic and other porous substances. At present, the most mature method of producing hydrogen peroxide at home and abroad is the anthraquinone method. This method is to dissolve the working carrier alkyl anthraquinone in a specific organic solvent to make a working solution, and hydrogenate the anthraquinone with hydrogen under the action of a catalyst. Reduction, anthrahydroquinone is generat...

Claims

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Application Information

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IPC IPC(8): C01B15/023
CPCC01B15/023
Inventor 尹华清
Owner WUHAN YOULIKE NEW MATERIAL TECH
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