Twice-aged porous inorganic oxides, catalysts, and polymerization processes
US5115053A · kind A · utility
34Cited by
20References
40Claims
0Family size
Assignee
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Key dates
| Filing date | Nov 13, 1990 |
| Grant date | May 19, 1992 |
| Priority date | — |
| Expiry date | Nov 13, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J37/03
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A silica-titania cogel or silica-titanic-chromium tergel is first aged at a substantially neutral pH, then aged at an alkaline pH, and then spray dried or azeotrope dried to form a xerogel. Optionally, a pore- preserving agent can be added prior to drying. The cogel can be impregnated with a chromium compound. The chromium-containing catalyst is activated by calcination. The activated catalyst can be used as a polymerization catalyst to polymerize mono-1-olefins.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.