Exxon Research and Engineering Company

Torris G Jermansen

Alexis A Oswald

I-Der Huang

Andrew A Westner

Ramesh Varadaraj

Cornelius Hendrick Brons

Irwin A Wiehe

Raymond J Kennedy

The present invention is an asphaltene dispersant containing an aromatic, a sulfonic acid head, and an alkyl tail containing 16 carbons or more and at least one branch of a methyl or longer alkyl. Preferably, the aromatic is a fused two ring aromatic and the tail is a two, branched alkyl tail of 30 carbons or longer.

Branched alkyl-aromatic sulfonic acid dispersants for solublizing

Branched alkyl diaryl phosphine rhodium carbonyl hydride complexes are surprisingly effective, stable and selective hydroformylation catalysts particularly in the presence of a large excess of t-phosphine ligands. As such, they are advantageously employed as catalysts in a novel low pressure rhodium hydroformylation process producing normal and iso aldehydes by reacting olefins with H.sub.2 and CO.

Hydroformylation catalysis by branched alkyl diaryl phosphine rhodium

Described is a carbonylation process using novel homogeneous trihydrocarbyl silyl-substituted alkyl diaryl phosphine transition metal complexes of the general formula:

Trihydrocarbyl silyl substituted alkyl diaryl phosphine transition metal

Homogeneous hydroformylation catalysis with silyl substituted alkyl

Novel homogeneous trihydrocarbyl silyl-substituted alkyl diaryl phosphine transition metal complexes of the general formula:

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Staten Island, NY, United States of America

Torris G Jermansen