New post-treatment process of working solution for producing hydrogen peroxide by anthraquinone method

Abstract

The invention relates to a novel post-treatment process of a working solution for producing hydrogen peroxide by an anthraquinone method, which comprises a fibrous membrane alkali tower, an alkali settler, an alkali evaporator, a concentrated alkali liquor storage tank, a carclazyte bed and a working solution storage tank, and is characterized in that the working solution from an extraction procedure and the concentrated alkali liquor from the concentrated alkali storage tank jointly pass through the fibrous membrane alkali tower and fully react in the fibrous membrane alkali tower; the reacted working solution and dilute alkali liquor are discharged from the fiber membrane alkali tower and enter an alkali settler; the dilute alkali liquor flows to the alkali evaporator from the alkali settler, and forms concentrated alkali liquor again after water is removed in the alkali evaporator, and the concentrated alkali liquor flows to the concentrated alkali liquor storage tank and then enters the fiber membrane alkali tower to continue to be in contact reaction with the working solution; and the working solution flows to the carclazyte bed from the alkali settler, flows into the working solution storage tank after being treated by the carclazyte bed, and then enters the hydrogenation process. The mass transfer efficiency of the working solution and the alkali liquor is remarkably improved, and the liquid holdup of an existing alkali treatment unit is reduced.

Description

technical field [0001] The invention relates to a new post-treatment process of a working liquid used in the production of hydrogen peroxide by an anthraquinone method. Background technique [0002] Hydrogen peroxide is a green oxidizing agent, which is widely used in chemical industry. At present, industrial hydrogen peroxide is generally produced by the anthraquinone method. In the anthraquinone method, the carrier and the solvent are composed of a working solution in a certain proportion. The quinone or their mixture is used as the carrier, and the mixture of heavy aromatic hydrocarbon, trioctyl phosphate, o-methylcyclohexyl acetate and tetrabutyl urea is used as the solvent. The working fluid circulates in the system in the order of hydrogenation, oxidation, extraction, and post-treatment, and produces hydrogen peroxide. In the hydrogenation process, the working liquid undergoes a hydrogenation reaction under the action of a catalyst to obtain a hydrogenated liquid; in...

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Problems solved by technology

[0007] ②The working fluid is easy to entrain the lye, and the alkali settler cannot completely separate the lye, resulting in a large consumption of activated alumina in the subsequent clay bed treatment process, which has potential safety hazards;

[0008] ③The working liquid cannot be fully mixed in the lye, resulting in insufficient contact between the working liquid and the lye, and the effects of dehydration, hydrogen peroxide removal, and regeneration of degradation products are prone to fluctuations

Chinese patent CN101618859A discloses a drying tower with a lye distributor, which uses liquid injection to promote the contact between the lye and the working fluid, increasing the throughput, but the volume of the alkali tower is not significantly reduced

Chinese patent CN206457253U discloses a lye separator for anthraquinone-based hydrogen peroxide process, which uses positive and negative staggered corrugated packing to promote the aggregation of lye droplets entrained in the working liquid, but the promotion effect on the two-phase contact reaction is general

In the production technology of hydrogen peroxide by anthraquinone method, the working fluid contains hydrogen peroxide, which will be decomposed to generate oxygen in the alkali treatment process, and the generation of gas will cause the following problems: hinder the formation of a liquid film between the oil and water phases, and affect mass transfer; Causes foaming of the working fluid, and mist entrainment in severe cases

It is impossible to directly apply the existing fiber membrane technology to the field of anthraquinone hydrogen peroxide production

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