Preparation of filterable double metal cyanide complex catalyst for propylene oxide polymerization
US4843054A · kind A · utility
39Cited by
8References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 8, 1988 |
| Grant date | Jun 27, 1989 |
| Priority date | — |
| Expiry date | Aug 8, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/30
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The reaction products of metal salts and alkali metal cyanometallates are not easily separated because the particle size of the metallate is too small to allow filtration under normal conditions. Centrifugation, dialysis, or conversion to a filterable metal hydroxide salt are the methods previously described for separating the alkali metal salt formed during reaction from the catalyst. Reaction in the presence of an inert filter-aid has been found to give a filterable catalyst which can be washed clean of the alkali metal salt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.