Patent ID: 6074532
Filing Date: 2000-06-13
Classification: C07C,Y10S

Abstract:
A method for removing aldehydes from an aldehyde-contaminated acrylonitrile stream, wherein said contaminated stream is passed through a distillation column having an inlet end and an outlet end, comprising the steps of:a) making a solution of a substituted aromatic amine having electron-donating group substituents in a solvent containing a catalytic amount of a mineral acid;b) adding an effective aldehyde-scavenging amount of said solution of step a) to said stream at said inlet end of said column;c) scavenging aldehyde by forming of an aldehyde-aromatic amine Schiff base in said stream as said stream flows through said column, wherein said base remains within said column; and then,d) recovering a purified acrylonitrile stream from said outlet end at the top of said distillation column.