Method of reducing the formation of scale in the production of soda ash from trona and nahcolite ores
US6022516A · kind A · utility
5Cited by
13References
20Claims
0Family size
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Key dates
| Filing date | Jun 17, 1998 |
| Grant date | Feb 8, 2000 |
| Priority date | — |
| Expiry date | Jun 17, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01D7/126
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The methods for decreasing scale formation in processes for the production of soda ash from trona or nahcolite ores are provided. Diphosphonic acid materials such as 1-hydroxy-ethylidene diphosphonic acid, 1-hydroxy-propylidene-1,-diphosphonic acid, 1-hydroxy-butylidene-1,-diphosphonic acid and 1-hydroxy-pentylidene-1,-diphosphonic acid have been found to diminish significantly the formation of magnesium scale in such processes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.