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US 6,617,279 B2Granted
Catalyst composition and method for producing diaryl carbonates, using bisphosphines
AssigneeGeneral Electric Company
InventorsBen Purushotam Patel, Grigorii Lev Soloveichik, John Yaw Ofori
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Abstract
Hydroxyaromatic compounds such as phenol are carbonylated with oxygen and carbon monoxide in the presence of a catalyst system comprising a Group VIIIB metal, preferably palladium; an iodide salt, preferably sodium iodide; and at least one organic bisphosphine such as 1,3-bis(diphenylphosphino)propane or 1,4-bis(diphenylphosphino)butane. The catalyst system also preferably contains a compound of cerium or lead.
Claims13
A catalyst composition comprising the following and any reaction products thereof:
- (A) a Group VIII metal having an atomic number of at least 44 or a compound thereof,
- (B) at least one iodide salt, said iodide salt being selected from the group consisting of alkali metal iodides, alkaline earth metal iodides, and tetraalkylammonium iodides, and
- (C) at least one organic bisphosphine.
A catalyst composition comprising the following and any reaction products thereof:
- (A) palladium or a compound thereof,
- (B) at least one alkali metal iodide in the amount of about 40-100 equivalents of iodide per gram-atom of palladium in component A,
- (C) 1,3-bis(diphenylphosphino)propane or 1,4-bis(diphenylphosphino)butane, and
- (D) at least one cerium or lead compound.
1 more element
Dependencies are inferred from the claim text.