Production process of chromatographic grade acetonitrile

By using a combination of composite flocculant and adsorbent in waste acetonitrile, the problem of difficulty in removing suspended solid particles is solved, and a method of extracting high-purity chromatographic grade acetonitrile from waste acetonitrile in coatings and synthetic fibers is realized, and acetonitrile is improved. Purity and process sustainability.

CN119176767AActive Publication Date: 2024-12-24CONCORD TECH (TIANJIN) CO LTD
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Patent Information

Application Number
CN202411686705.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-25
Publication Date
2024-12-24
Estimated Expiration
2044-11-25

AI Technical Summary

Technical Problem

The prior art is difficult to extract high-purity chromatographic grade acetonitrile from waste acetonitrile generated in the fields of coatings and synthetic fibers, and suspended solid particles are difficult to remove by sedimentation or distillation, resulting in difficulty in improving purity.

Method used

Pretreatment with composite flocculants, including alum and EDTA, formed colloid precipitation and filtered, followed by oxidation treatment and adsorption steps, activated carbon fibers and molecular sieves are used as adsorbents, combined with azeotropic distillation and secondary adsorption, through molecular sieve A and silica gel Further remove impurities and control process parameters to achieve high purity.

Benefits of technology

It effectively removes suspended solids and small molecule impurities, reduces the risk of oxidant deflagration, and increases the purity of acetonitrile, so that the UV absorbance of the final product reaches 0.212Å at 190nm, meeting the chromatographic standard.

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Abstract

The invention specifically discloses a chromatographic grade acetonitrile production process, which comprises the following steps: pretreatment, primary adsorption, azeotropic distillation, secondary adsorption, suspended solid particle sedimentation by alum, and precipitation of a complex through EDTA under the condition of low water content to remove most insoluble and soluble impurities in acetonitrile. Oxidizing small molecular impurities and oxidizing organic impurities with the boiling point lower than or similar to that of acetonitrile, so that the impurities become high-boiling-point substances, and removing the high-boiling-point substances through rectification; the method comprises the following steps: carrying out primary adsorption on acetonitrile to remove an oxidant, carrying out azeotropic distillation to obtain rectified acetonitrile containing a very small amount of water and organic impurities, and carrying out adsorption treatment on the rectified acetonitrile again to obtain high-purity acetonitrile with the content of 99.99% or more, the ultraviolet absorbance at 190nm as low as 0.195, the ultraviolet absorbance at 200nm as low as 0.009 and the ultraviolet absorbance at 254nm as low as 0.002.
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Citation Information

Patent Citations

  • Biochemical system for treatment of heavy metals wastewater and process thereof

    CN105936564A

  • Chromatographically pure acetonitrile as well as preparation method and production system thereof

    CN107382776A

  • Method for preparing high-purity acetonitrile from biomedicine produced waste acetonitrile

    CN108794348A

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    CN113416151A

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Cited By

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