Rectification separation process of 2-butenoic acid crude product

The invention discloses a rectification separation process of a 2-butenoic acid crude product, which comprises the following steps: S1, carrying out light component removal treatment on the 2-butenoic acid crude product, separating light components from the top of a light component removal tower, extracting a material A from a tower kettle, and sending the material A to a solvent removal tower; s2, desolventizing the material A, separating a material B from the top of a desolventizing tower, extracting a material C from a tower kettle, and sending the material C to a crotonaldehyde removal tower; s3, removing 2-butenal from the material C, separating a material D from the top of a crotonaldehyde removal tower, extracting a material E from a tower kettle, and sending the material E to a finished product tower; and S4, carrying out cis-2-butenoic acid removal treatment and high-boiling-point substance removal treatment on the material E, separating out a material F from the tower top of a finished product tower