Malononitrile purification method

The separation of malononitrile through the melt crystallization method solves the problems of solvent volatilization, vacuum pump clogging and high energy consumption in the existing technology, achieves the purification of malononitrile with high purity and high yield, and reduces the refining cost and energy consumption.

CN112679385AActive Publication Date: 2021-04-20HEBEI CHENGXIN +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HEBEI CHENGXIN
Filing Date
2020-12-31
Publication Date
2021-04-20

AI Technical Summary

Technical Problem

Existing malononitrile purification methods have problems such as environmental pollution caused by solvent volatilization, vacuum pump clogging, high energy consumption, and difficulty in reaching 99.9% purity.

Method used

The melt crystallization method is used to separate malononitrile from crude malononitrile. Through two crystallization processes, the temperature and energy consumption are reduced, polymerization is avoided, and the purity and yield are improved.

Benefits of technology

It significantly reduces the refining cost of malononitrile, achieves a purity of more than 99.95% and a yield of more than 99%, avoids solvent volatilization and vacuum pump clogging, and reduces energy consumption by more than 50%.

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Abstract

The invention relates to the technical field of compound purification, and particularly discloses a malononitrile purification method. The purification method of malononitrile specifically comprises the step of separating malononitrile from a malononitrile crude product through adoption of a melt crystallization method. According to the malononitrile purification method provided by the invention, a vacuum system does not need to be arranged, the required temperature is relatively low, the energy consumption is reduced by 50% or above, the refining cost and refining time of malononitrile are greatly reduced, and the finally obtained malononitrile pure product has extremely high purity and yield.
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Citation Information

Patent Citations

  • Malononitrile synthesis method

    CN104945278A

  • Method for adopting melting crystallization technology to separate and purify succinonitrile

    CN107721878A

  • Synthesis method of malononitrile

    CN107827777A

  • Separation and extraction method for malononitrile

    CN110156632A

  • Process for preparing high-purity malononitrile

    CN1250772A