Method for producing hydrogen peroxide

一种过氧化氢、制造方法的技术，应用在过氧化氢、化学仪器和方法、过氧化物/过氧水合物/过氧酸/超氧化物/臭氧化物等方向，能够解决增大设备费用负担、金属类从催化剂溶出量增加、增加催化剂初期投资等问题，达到杂质含量少的效果

Inactive Publication Date: 2008-01-16
MITSUBISHI GAS CHEM CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, in order to make up for the slow reaction in the hydrogenation process, a large reactor must be used, which will inevitably increase the burden of equipment costs.
In addition, as another solution, in order to make up for the slow reaction speed, the amount of catalyst can also be increased, but not only the initial investment in the purchase of the catalyst is increased, but also the amount of metals leached from the catalyst is also increased due to the increase in the amount of the catalyst. additional questions

Method used

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  • Method for producing hydrogen peroxide
  • Method for producing hydrogen peroxide

Examples

Experimental program
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Embodiment 1

[0042] With the anthraquinone concentration in the working solution as 0.6 mol / L and the composition ratio as EtAQ (30 mol%)+AmAQ (70 mol%), the hydrogen absorption in the working solution was evaluated.

[0043] The specific measurement method is as follows. 100 mg of supported palladium catalyst (equivalent to Pd=1 mg) and 25 ml of working solution were added to a 100 ml three-necked flask. As a solvent for the working solution, a mixed solvent of 60% by volume of pseudocumene and 40% by volume of diisobutylmethanol was used. A flask equipped with a magnetic induction stirrer and a vacuum piston that can be completely sealed inside is set in an atmospheric pressure hydrogenation reaction device. This device detects the pressure change in the flask through the water level, and supplies hydrogen in balance with the hydrogen absorption from the metering tube through the switching solenoid valve. The hydrogen metering tube includes a burette part and a water storage part, and ...

Embodiment 2

[0045] The hydrogen absorption rate was measured using the same method as in Example 1 except that EtAQ (15 mol%)+AmAQ (85 mol%) was used. The hydrogen absorption rate was 119 Nml. The results of the hydrogen absorption rate are shown in FIG. 2 .

Embodiment 3

[0054] Using a hydrogen peroxide production device that has a hydrogenation process, an oxidation process, an extraction process, and a regeneration process, the working solution is circulated to study the components of the produced hydrogen peroxide.

[0055] The structure of the hydrogen peroxide production apparatus is as follows.

[0056] Hydrogenation process: Stirred hydrogenation reactor, hydrogenation catalyst is Pd catalyst;

[0057] Oxidation process: in the form of a multi-stage counter-flow oxidation tower (reaction temperature: 40°C).

[0058] The working solution is a substance that is used for many years, and its composition contains age-degraded substances that cannot be analyzed. The main composition of anthraquinones in the working solution and the phthalic acid content in the resulting hydrogen peroxide are shown below.

[0059] Anthraquinones in working solution

[0060] Amyl anthraquinone=420mmol / l; Amyl tetrahydroanthraquinone=80mmol / l;

[0061] Ethyl...

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Abstract

The present invention provides a method for producing hydrogen peroxide, comprising the steps of: alternately reducing and oxidizing a working solution containing anthraquinone compounds as a reaction medium, wherein a mixture of alkyl-substituted anthraquinones and alkyl-substituted tetrahydroanthraquinones in a molar ratio of from 2:1 to 8:1 is used as the anthraquinone compounds in the working solution, in the reduction step all of the tetrahydroanthraquinones and some or all of the anthraquinones in the working solution are reduced; and keeping the content of alkyl-substituted anthrahydroquinones in the working solution after the reduction step and before the oxidation step higher than the content of alkyl-substituted tetrahydroanthrahydroquinones, wherein ethylanthraquinone and cthyltctrahydroanthraquinonc arc used as anthraquinone compounds in the working solution in a total proportion of both of from 10 to 45 mol% of all of the anthraquinone compounds in the working solution.

Description

technical field [0001] The present invention relates to an improved method for continuously producing hydrogen peroxide by repeatedly reducing and oxidizing anthraquinones (hereinafter referred to as "anthraquinone and / or tetrahydroanthraquinone") contained in a working solution. In more detail, it relates to a method for producing hydrogen peroxide, which is characterized in that specific amounts of ethylanthraquinone and ethyltetrahydroanthraquinone are used as anthraquinones. Background technique [0002] An anthraquinone method is known as an industrial production method of hydrogen peroxide. In this method, the anthraquinones are dissolved in an organic solvent to obtain a working solution, and the anthraquinones are reduced by hydrogen in the presence of a hydrogenation catalyst in the hydrogenation process to generate anthrahydroquinones. Next, in the oxidation step, the anthrahydroquinones are converted into anthraquinones again, and hydrogen peroxide is generated s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B15/023
CPCC01B15/023C01B15/01
Inventor H·堺谷井浦克弘萩原猪佐夫长谷川浩松田久
Owner MITSUBISHI GAS CHEM CO INC
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