Preparation process of high-purity concentrated nitric acid

By leveraging the synergistic effects of multiple purification units, including oxidation, complexation, adsorption, and ion exchange, and utilizing composite stabilizers and activated silica, the problem of impurity removal in industrial concentrated nitric acid has been solved, enabling the preparation of high-purity concentrated nitric acid with high product purity and good stability.

CN122144666APending Publication Date: 2026-06-05ANHUI HUAERTAI CHEM IND
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ANHUI HUAERTAI CHEM IND
Filing Date
2026-01-26
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing technologies are insufficient to effectively remove various impurities from concentrated industrial nitric acid, especially metal ions and non-metallic impurities, resulting in substandard product quality that fails to meet increasingly stringent quality standards.

Method used

By employing the synergistic effect of multiple purification units, including oxidation, complexation, adsorption, distillation, and ion exchange, and utilizing the complexation and immobilization capabilities of composite stabilizers and the adsorption properties of activated silica, combined with ion exchange and ultrafiltration membranes under inert atmosphere protection, a highly efficient deep purification process is constructed.

Benefits of technology

It achieves systematic removal of metal ions, anions and organic impurities, significantly improving the purity and stability of concentrated nitric acid, and ensuring the high purity and long-term storage stability of the product.

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Abstract

The application relates to the technical field of chemical production, and particularly discloses a preparation process of high-purity concentrated nitric acid. The process comprises the following steps: firstly, industrial concentrated nitric acid, hydrogen peroxide solution and a special composite stabilizer are sequentially subjected to oxidation and complexation reaction to form a stable dispersion system; then, activated silicon dioxide powder is added for adsorption, and pretreated acid liquid is obtained through precision filtration; finally, the acid liquid is sequentially subjected to deep purification through anion exchange resin and an ultrafiltration membrane under the protection of an inert atmosphere. The core of the application is that through the synergistic effect of multiple purification units such as oxidation, complexation, adsorption, rectification and ion exchange, especially the high-efficiency complexation and fixation capacity of the composite stabilizer to metal ions and the adsorption performance of the activated silicon dioxide, metal ions, anions and organic impurities in the raw material acid can be efficiently removed, the concentrated nitric acid prepared by the process has extremely high purity, low impurity content and good product stability.
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