Method and apparatus for preparing a dialkyl carbonate, and its use in the preparation of diaryl carbonates and polycarbonates
US7345187B2 · kind B2 · utility
0Cited by
14References
23Claims
0Family size
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Key dates
| Filing date | Aug 14, 2001 |
| Grant date | Mar 18, 2008 |
| Priority date | — |
| Expiry date | Nov 24, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2219/00272
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Unexpected corrosion of downstream sections of a dialkyl carbonate manufacturing apparatus has been traced to alkyl chloroformate impurities, which slowly decompose to yield hydrochloric acid. An improved process and apparatus for dialkyl carbonate synthesis reduce corrosion by physically removing or chemically decomposing the alkyl chloroformate impurities within the corrosion-resistant upstream sections of the apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.