Process for isolating pure butyl acrylate from crude butyl acrylate by distillation, where butyl is n-butyl or isobutyl

US10906862B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Ortmund Lang · Quirnbach, DE
• Bernd Metzen · Ludwigshafen am Rhein, DE
• Claus Hechler · Mannheim, DE

Key dates

• Filing date: Dec 11, 2017
• Grant date: Feb 2, 2021
• Expiry date: Dec 11, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C69/54
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for isolating pure butyl acrylate from crude butyl acrylate, which is carried out in a dividing wall column having separation-active internals and a vaporizer, and in which: a dividing wall is arranged in a longitudinal direction of the column to form an upper joint column region, a lower joint column region, an inflow section having a side feed point and an offtake section having a side offtake point; a ratio of an amount of liquid at an upper end of the dividing wall going to an enrichment section and a stripping section of the column is set in the range from 1:0.2 to 1:5; and a ratio of an amount of vapor streams at a lower end of the dividing wall going to the stripping section and the enrichment section of the column is set in a range from 1:0.5 to 1:2.0.