Improved method of dewatering sludge
US5354480A · kind A · utility
14Cited by
13References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 18, 1992 |
| Grant date | Oct 11, 1994 |
| Priority date | — |
| Expiry date | Feb 18, 2012 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/455
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The dewatering of sludge is improved by utilizing a water-soluble cationic copolymer in the aqueous phase of a water-in-oil emulsion wherein the copolymer has been prepared by (i) preparing an aqueous solution of a non-ionic monomer and a portion of the cationic monomer, (ii) emulsifying the aqueous solution in a hydro-carbon oil to form a water-in-oil emulsion, (iii) adding the balance of the total intended cationic monomer to the emulsion while substantially no polymerization is occurring, and (iv) polymerizing the monomers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.