Distillation column and use thereof for cleaning isocyanates

US10576392B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Friedhelm Steffens · Leverkusen, DE
• Wilfried Hedderich · Hilden, DE
• Jürgen Bausa · Kürten, DE
• Franz Beggel · Cologne, DE
• Volker Michele · Cologne, DE

Key dates

• Filing date: Sep 23, 2016
• Grant date: Mar 3, 2020
• Expiry date: Sep 23, 2036

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C263/20
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A distillation column for separating a multicomponent mixture into at least three fractions. The distillation column has at least one separating wall and at least one material exchange element (1) above the at least one separating wall. A device (10) for mixing the steam flows flowing upwards to the left and the right of the at least one separating wall is arranged between the at least one separating wall and the at least one material exchange element (1). The use of the distillation column for purifying isocyanates, in particular for toluene diisocyanate (TDI), is also described.