Coal liquor clarification with water-soluble, high molecular weight polymers having low concentration of cationic moieties
US4676913A · kind A · utility
4Cited by
7References
8Claims
0Family size
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Key dates
| Filing date | Feb 6, 1986 |
| Grant date | Jun 30, 1987 |
| Priority date | — |
| Expiry date | Feb 6, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F1/54
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Coal liquors are clarified by contacting them with high molecular weight copolymers of from about 70 to about 99 mole percent of a nonionic water-soluble monomer such as acrylamide and from 1 to 30 mole percent of a cationic monomer such as methacryloylethyl trimethyl ammonium chloride or methacrylamidopropyl trimethyl ammonium chloride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.