Stredford process peroxyl production work liquid post treatment method

Abstract

A process for handling the extraction raffinate of anthraquinone hydrogen peroxide is neutralizing the acidic extraction raffinate with concentrated basic sodium nitrate solution for decomposing the contained hydrogen peroxide, absorbing a part of water to suit to the regeneration of active aluminium oxide, and regenerating a part of degradation matter existed in the extract raffinate to suit to the hydrogenaton .

Description

technical field [0001] The invention relates to a method for producing hydrogen peroxide, in particular to a post-treatment method for producing hydrogen peroxide by an anthraquinone method. Background technique [0002] The anthraquinone method to produce hydrogen peroxide is to use alkylanthraquinone and its tetrahydro derivatives, such as 2-ethylanthraquinone, 2-amylanthraquinone, 2-butylanthraquinone, 2-methylanthraquinone, 2 , 3-dimethylanthraquinone, etc. and their 5, 6, 7, 8-tetrahydro derivatives, 2-ethylanthraquinone and 5, 6, 7, 8-tetrahydro 2-ethylanthraquinone are preferred In a specific solvent system, the solvent is composed of aromatic hydrocarbons, alkanes, cycloalkanes, aromatic hydrocarbons are preferred, and trioctyl phosphate, triethyl phosphate, methylcyclohexyl acetate, and trioctyl phosphate is the preferred binary solvent to form a working fluid. The working fluid is alternately hydrogenated and oxidized. In the hydrogenation process, 2-ethylanthraq...

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Problems solved by technology

[0005] After potassium carbonate is used for a period of time, a large amount of degradation products are enriched, and the content of organic impurities gradually increases. Although the concentration of the solution becomes thinner after absorbing water, the concentration of the solution is solved by evaporation and concentration. However, due to the high boiling point of organic impurities, the enrichment It is impossible to remove the degraded products. After the lye that has not removed the degraded impurities is returned to the alkali tower, because the degraded products tend to be saturated, it loses or partially loses the function of regenerating and dissolving the degraded products, and gradually loses the treatment effect of the working liquid. If it is replaced with fresh lye, it will cause loss of raw materials

The lye is not continuously fed and discharged in the alkali tower, which makes the water concentration gradient of the lye smaller and affects the dehydration effect

Due to the influence of lipophilicity and hydrophilicity of some degradation products, the miscibility of lye and working fluid increases, resulting in incomplete separation of lye and working fluid, and mutual entrainment

A small amount of lye entrained in the working fluid, after entering the activated alumina regeneration process, the activated alumina absorbs the water in the lye, the strength of the alumina is destroyed, and the regeneration effect is affected by pulverization, which reduces the service life of the activated alumina regeneration bed , when it is serious, the entrained lye enters the hydrogenation reactor, which affects the activity cycle of the hydrogenation catalyst

In the lye water evaporation step, the dissolved organic matter in the lye and the entrained working fluid partly escape with the water vapor, which not only causes difficulty in operation and loss of working fluid, but also pollutes the environment

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