Malononitrile purification method

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. 本发明涉及化合物提纯技术领域，具体公开一种丙二腈的提纯方法。所述丙二腈的提纯方法具体是通过熔融结晶的方法从丙二腈粗品中分离所述丙二腈。本发明提供的丙二腈的提纯方法不需要设置真空系统，且需要的温度较低，能耗降低50％以上，极大的降低了丙二腈的精制成本和精制时间，并使最终得到的丙二腈纯品兼具极高的纯度和收率。