Stable long-term method for producing C5-aldehydes

US9272973B2 · kind B2 · utility

Assignee

• Evonik Industries AG · DE

Inventors

• Dirk Fridag · Haltern am See, DE
• Robert Franke · Marl, DE
• Dieter Hess · Marl, DE
• Markus Schwarz · Haltern am See, DE
• Katrin Marie Dyballa · Recklinghausen, DE
• Hans-Gerd Lueken · Marl, DE
• Bart Hamers · Horst, NL
• Uwe Ernst · Marl, DE

Key dates

• Filing date: Sep 27, 2013
• Grant date: Mar 1, 2016
• Expiry date: Sep 27, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/65685
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for preparing aldehydes having five carbon atoms, in which an input mixture containing 10% by weight to 50% by weight of linear butenes and less than 5% by weight of 1-butene is hydroformylated with synthesis gas in the presence of a catalyst system comprising rhodium and at least one bisphosphite ligand, wherein the hydroformylation is effected in a reactor from which, over an operating period, a cycle gas containing at least a portion of the products and unconverted reactants from the hydroformylation is continuously drawn off and partly condensed, and uncondensed components of the cycle gas are recycled into the reactor, and wherein, after the operating period has expired, the hydroformylation is stopped, the reactor is freed of reaction residues and the hydroformylation is restarted. It is based on the problem of making such a process more economically viable. The problem is solved by using a bisphosphite of the formula (1) and/or (2) as ligand, extending the operating period to more than 8000 h, and not separating solid reaction residues out of the reactor during the course of the operating period.