Method for producing two isocyanates
US10626084B2 · kind B2 · utility
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16Claims
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Key dates
| Filing date | Aug 3, 2018 |
| Grant date | Apr 21, 2020 |
| Priority date | — |
| Expiry date | Sep 4, 2038 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/10
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method and a continuous process for producing two isocyanates by reacting a first amine with phosgene in a stoichiometric excess in the gas phase to produce a first isocyanate. The excess phosgene is subsequently recovered and recirculated back to react with a second amine to produce a second isocyanate. In an embodiment, both fresh and recycled phosgene may be used in reacting each respective amine to produce an isocyanate. The amine streams contain two different concentrations of hydrogen chloride: one may be between 0.0 and 0.1%, and another may be between 1 and 5% by weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.