Process for transitioning reactors from base-catalyzed polyol production to DMC-catalyzed polyol production
US9994506B2 · kind B2 · utility
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Key dates
| Filing date | Apr 20, 2016 |
| Grant date | Jun 12, 2018 |
| Priority date | — |
| Expiry date | Apr 20, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/2669
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for transitioning a reactor from base-catalyzed polyol production to double metal cyanide (DMC)-catalyzed polyol production is described. The process includes discharging a base-catalyzed and un-neutralized product mixture from a reactor, and adding an acidified polyether polyol starter and DMC catalyst mixture to the reactor. A DMC-catalyzed polyol production reaction can then be conducted in the reactor without intermediate washing or rinsing of the reactor, and without catalyst deactivation from base or alkaline hold-up.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.