Removal of palladium compound catalyst residues from polymer ketones
AssigneeShell Oil Company
InventorJohannes A. M. Van Broekhoven
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Abstract
The invention is a process for reducing catalyst residues from a Group VIII metal compound-containing polymer of CO, ethylene and optionally at least one olefinically unsaturated hydrocarbon. The process comprises contacting the polymer with an effective amount of carbon monoxide or a carbon monoxide-containing gas. It is preferable for the process to use a carbon monoxide partial pressure of at least 0.1 bar and a temperature of at least 60.degree. C., which temperature is at least 20.degree. C. higher than that at which the polymers were prepared.
Claims35
A process for reducing catalyst residues in a polymer, which process comprises (1) suspending an isolated palladium compound catalyst-containing polymer of carbon monoxide, ethylene with or without at least one other olefinically unsaturated hydrocarbon in an organic liquid, (2) contacting the polymer suspension with an effective amount of carbon monoxide and (3) recovering a polymer having reduced palladium compound catalyst residues.
A process for preparing a polymer having reduced catalyst residues which process comprises (1) contacting carbon monoxide, ethylene with or without propylene in the presence of a catalyst obtained from a palladium compound, an anion of a non-hydrohalogenic acid having a pKa less than 6, and a bidentate phosphine ligand of the general formula ##STR7## wherein R is a bivalent organic bridging group having a bridge containing three carbon atoms, and R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are hydrocarbon or substituted hydrocarbon, in the presence of a lower alcohol and under conditions suitable for preparing a polymer suspension in the lower alcohol, (2) preparing a polymer suspension in the lower alcohol, (3) contacting the polymer suspension subsequent to its preparation but prior to recovery of the polymer with an effective amount of carbon monoxide alone, and at a temperature of about 80.degree. to about 200.degree. C., and (4) recovering a polymer having reduced palladium catalyst residues.
Dependencies are inferred from the claim text.