Process for the recovery of phosphorus and iodine containing catalyst components
AssigneeEastman Chemical Company
InventorsJeffrey Scott Kanel, Stanley John Okrasinski
Life of this patent
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Abstract
Disclosed is a process for the recovery of phosphorus and/or iodine containing catalyst components, present as an organophosphorus compound such as trihydrocarbylphosphine compounds and tetrahydrocarbylphosphonium compounds, from a solution of at least one such organophosphorus compound in an organic solvent by the steps comprising (1) converting the organophosphorus compound to an iodide complex of a organophosphonium compound which is insoluble in the organic solvent; and (2) separating the insoluble iodide complex of the organophosphonium compound from the solution. The process also results in the recovery of iodine values present in the solution.
Claims10
Process for the recovery of an organophosphorus compound from a solution of at least one such organophosphorus compound and an iodine-containing compound in an organic solvent comprising the steps of (1) adding an oxidizing agent and elemental iodine to the solution to convert the organophosphorus compound to an iodide complex which is insoluble in the organic solvent;
- and (2) separating the insoluble iodide complex from the solution;
- wherein the organophosphorus compound is tetrahydrocarbylphosphonium and has the structure:
- wherein R1, R2, R3 and R4 are independently selected from alkyl, phenyl, cycloalkyl, aryl, alkoxy, cycloalkoxy, phenoxy and aryloxy;
- and
- wherein X− is a halide.
Process for the recovery of an organophosphorus compound compounds from a solution of at least one such organophosphorus compound and an iodine-containing compound in an organic solvent comprising the steps of (1) adding elemental iodine to the solution to convert the organophosphorus compound to an iodide complex which is insoluble in the organic solvent;
- and (2) separating the insoluble iodide complex from the solution;
- wherein the organophosphorus compound is tetrahydrocarbylphosphonium and has the structures:
- wherein R1, R2, R3 and R4 are independently selected from alkyl, phenyl, cycloalkyl, aryl, alkoxy, cycloalkoxy, phenoxy and aryloxy;
- and
- wherein X− is a halide.
Process for the recovery of phosphorus and iodine components from a catalyst solution comprising a Group VIII non-noble metal, methyl iodide and a tetrahydrocarbylphosphonium iodide dissolved in a process solvent comprising acetic acid or a mixture of acetic acid and water which comprises the steps of (1) adding molecular iodine to the catalyst solution and converting the organophosphonium iodide to an iodide complex of the organophosphonium iodide which is insoluble in the process solvent;
- and (2) separating the insoluble iodide complex of the organophosphonium iodide from the solution;
- wherein the tetrahydrocarbylphosphonium iodide has the structure:
- wherein R1, R2 and R3 are selected from butyl and phenyl;
- and wherein R4 is a methyl.
Dependencies are inferred from the claim text.