Two-stage hydroformylation process with circulating gas and SILP technology

US9624153B2 · kind B2 · utility

Assignee

• EVONIK DEGUSSA GMBH · DE

Inventors

• Marc Becker · Trier, DE
• Katrin Marie Dyballa · Recklinghausen, DE
• Robert Franke · Marl, DE
• Dirk Fridag · Haltern am See, DE
• Hanna Hahn · Moers, DE
• Marina Lazar · Langenselbold, DE
• Markus Priske · Mobile, US
• Guido Stochniol · Haltern am See, DE

Key dates

• Filing date: Dec 10, 2014
• Grant date: Apr 18, 2017
• Expiry date: Dec 10, 2034

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2531/822
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to processes for preparing aldehydes by hydroformylation of alkenes, in which an alkene-containing feed mixture is subjected to a primary hydroformylation with synthesis gas in the presence of a homogeneous catalyst system, the primary hydroformylation being effected in a primary reaction zone from which a cycle gas containing at least some of the products and unconverted reactants of the primary hydroformylation are drawn off continuously and partly condensed, with recycling of uncondensed components of the cycle gas into the primary reaction zone, and with distillative separation of condensed components of the cycle gas in an aldehyde removal stage to give an aldehyde-rich mixture and a low-aldehyde mixture. The problem that it addresses is that of developing the process such that it achieves high conversions and affords aldehyde in good product quality even in the case of a deteriorating raw material position. More particularly, a solution is to be found for making legacy oxo process plants capable of utilizing lower-value raw material sources. This problem is solved by separating the low-aldehyde mixture into a retentate and a permeate by means of a membra…