Method for processing a liquid hydroformylation discharge

US6727391B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Karl-Heinz Walczuch · Ludwigshafen, DE
• Rolf Muller · Karben, DE
• Roland Krokoszinski · Bad Dürkheim, DE
• Bernhard Geissler · Schwarzenbruck, DE

Key dates

• Filing date: Aug 8, 2002
• Grant date: Apr 27, 2004
• Expiry date: Aug 8, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C45/50
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A liquid output from a continuous hydroformylation, which comprises essentially aldehydes, high-boiling by-products, a homogeneously dissolved hydroformylation catalyst, unreacted olefins, low-boiling by-products and dissolved synthesis gas, is worked up by a process in whicha) the liquid hydroformylation output is depressurized in a first depressurization stage to a pressure which is from 2 to 20 bar below the reactor pressure, resulting in separation into a liquid phase and a gas phase, andb) the liquid phase obtained in the first depressurization stage is depressurized in a second depressurization stage to a pressure which is lower than the pressure of the first depressurization stage, resulting in separation into a liquid phase comprising essentially high-boiling by-products of the hydroformylation, the homogeneously dissolved hydroformylation catalyst and small amounts of hydroformylation product and unreacted olefin and a gas phase comprising essentially the major part of the hydroformylation product, unreacted olefin and low-boiling by-products.