Dispersant for high solids coal-water slurries
US4462808A · kind A · utility
5Cited by
1References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 4, 1983 |
| Grant date | Jul 31, 1984 |
| Priority date | — |
| Expiry date | Aug 4, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S516/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An improved coal-water slurry containing finely divided coal particles and a dispersing agent which is comprised of a water-soluble homopolymer of a monomer represented by the formula: ##STR1## wherein: M is hydrogen, lithium, sodium, potassium, magnesium, or calcium; PA1 R is allyl or methallyl; PA1 R.sub.1 is hydrogen, allyl or methallyl; PA1 R.sub.2 is hydrogen or sulfonate; PA1 R.sub.3 is hydrogen or sulfonate; and providing that R.sub.2 is not the same as R.sub.3. These improved coal-water slurries are best formulated at a pH of at least 6 and, preferably, above 8. The dispersants have a molecular weight between 1000-20,000.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.