Catalytic formation of diarylcarbonates
US5239105A · kind A · utility
13Cited by
13References
22Claims
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Key dates
| Filing date | Jan 30, 1992 |
| Grant date | Aug 24, 1993 |
| Priority date | — |
| Expiry date | Jan 30, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C68/02
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Diphenylcarbonate is produced by contacting phenol with phosgene or phenylchloroformate or mixture thereof in the presence of one or more heterogeneous catalysts. The catalysts include Group VB metal oxides: silicates of Groups IIA, IIIB, IVB, VB, and the lanthanide and actinide metals: tungsten oxides: and clays. The more preferred catalysts are silicates of yttrium, titanium, or zirconium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.