Work-up of a 3-methyl-1-butene-containing mixture

US8415520B2 · kind B2 · utility

Assignee

• Evonik Oxeno GmbH · DE

Inventors

• Markus Winterberg · Waltrop, DE
• Alfred Kaizik · Marl, DE
• Armin Matthias Rix · Marl, DE
• Michael Grass · Bend, US
• Wilfried Bueschken · Haltern, DE
• Marc Becker · Trier, DE

Key dates

• Filing date: Apr 29, 2010
• Grant date: Apr 9, 2013
• Expiry date: Apr 29, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C7/06
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention is a method for processing a mixture containing water, 3-methyl-1-butane and at least one other methylbutene. The method comprises primary distillation of the mixture, giving a gaseous primary overhead product containing methylbutene and water and a water-free primary bottom product containing 3-methyl-1-butene; condensation of the gaseous primary overhead product so as to give a condensate comprising a liquid aqueous phase and a liquid organic phase; separation of the condensate into a liquid aqueous phase and a liquid organic phase; discharge of the liquid aqueous phase; recirculation of the organic phase to the primary distillation; and finally secondary distillation of the water-free primary bottom product from the primary distillation so as to give a secondary overhead product comprising 3-methyl-1-butene and a secondary bottom product. The secondary overhead product obtained has a purity which enables it to be used directly as monomer or comonomer for preparing polymers or copolymers.