Dimeric aluminum compounds and their use
US4655934A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1985 |
| Grant date | Apr 7, 1987 |
| Priority date | — |
| Expiry date | Sep 12, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01F7/64
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of clarifying waters having an alkalinity of at least 100 ppm, calculated as CaCO.sub.3, which comprises: PA1 a. adding thereto, to form a treated water, an effective amount for the purpose of clarifying said waters of a low-basicity polynuclear aluminum species having the formula: EQU Al.sub.n (OH).sub.m Z.sub.3n-m PA2 wherein, n is at least 1.0 PA2 Z is a halide chosen from the group chloride, bromide, iodide, and mixtures thereof, and PA2 wherein the ratio of m/n ranges between about 0.25 to about 1.0 and at least 25 mole percent of the polynuclear aluminum species above has n equal to 2.0, and then, PA1 b. allowing sufficient time to form and build a floc dispersed in the treated water, which floc contains turbidity causing components, and then, PA1 c. phase separating the floc from the treated waters to obtain clarified water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.