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Continuous Gas‐Phase Hydroformylation of a Highly Diluted Technical C4 Feed using Supported Ionic Liquid Phase Catalysts
Author(s) -
Haumann Marco,
Jakuttis Michael,
Franke Robert,
Schönweiz Andreas,
Wasserscheid Peter
Publication year - 2011
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201100117
Subject(s) - hydroformylation , catalysis , ionic liquid , chemistry , isomerization , ligand (biochemistry) , phase (matter) , selectivity , butane , bimetallic strip , organic chemistry , inorganic chemistry , rhodium , biochemistry , receptor
The concept of supported ionic liquid phase (SILP) catalysis has been established in recent years by our group and others. Its application in continuous catalytic gas‐phase processes provides a very attractive way to bridge the gap between homogeneous and heterogeneous catalysis. In this contribution, we extend SILP hydroformylation catalysis to reactions with a highly diluted, technical C4 feed containing 1.5 % 1‐butene, 28.5 % 2‐butenes, and 70 % of inert n ‐butane. To obtain the desired product, n ‐pentanal, the Rh‐biphephos catalyst system was immobilized in the SILP system to allow for consecutive isomerization/hydroformylation activity. The resulting SILP catalyst material converted up to 81 % of the reactive butenes, with a residence time of 155 s in the reactor. An n ‐pentanal selectivity greater than 92 % was realized for more than 500 h time‐on‐stream in the continuous gas‐phase reaction. Post‐reaction NMR studies revealed no significant loss of the phosphite ligand through ligand oxidation during the reaction.