Method of quantitative analysis of organophosphorus compounds
AssigneeEastman Kodak Company
InventorsThomas J. Devon, Jerry C. Dobbs
Life of this patent
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Abstract
A novel method quantitatively analyzes certain organophosphorus compounds present in mixtures of the organophosphorus compounds, a Group VIII metal and an inert solvent using gas chromatography techniques. The method involves the conversion of a catalytically-active form of the Group VIII metal to a cyano complex prior to gas chromatography analysis. Compositions are also described which are useful in the gas chromatography analysis.
Claims8
Process for determining the concentration of organo-phosphine compounds present in a solution containing a complex of an organo-phosphine compound and rhodium which comprises the steps of:
- (a) contacting the solution with a cyano reagent to convert the organo-phosphine:rhodium complex to a cyano-rhodium complex;
- and
- (b) subjecting the solution obtained from step (a) to gas-liquid chromatography analysis.
Process for determining the concentration of organo-phosphine compounds present in a solution containing a complex of an organo-phosphine compound and rhodium which comprises the steps of:
- (a) contacting the solution with a second solution comprising a cyano reagent, a gas chromatographic internal standard and an inert solvent to convert the organo-phosphine:rhodium complex to a cyano rhodium complex;
- and
- (b) subjecting the solution obtained from step (a) to gas chromatography analysis.
Process for determining the concentration of organo-phosphine compounds present in a solution collected from a hydroformylation production system and containing a complex of an organo-phosphine compound and rhodium which comprises the steps of:
- (a) contacting the solution with a second solution comprising a tetra(hydrocarbyl(ammonium wherein the total carbon content of the 4 hydrocarbyl groups is about 4 to 32 atoms, a chromatographic internal standard and an inert, an organic solvent to convert the organo-phosphine:rhodium complex to a cyanorhodium complex wherein the amount of cyano reagent used provides about 10 to 50 moles cyanide ion per gram-atom rhodium;
- and
- (b) subjecting the solution obtained from step (a) to gas chromatography analysis.
Dependencies are inferred from the claim text.