Production of sodium carbonate
US4021527A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 16, 1975 |
| Grant date | May 3, 1977 |
| Priority date | — |
| Expiry date | Jul 16, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01D7/126
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Method of preparing refined, dense soda ash from crude trona by calcining the crude trona to crude sodium carbonate, mixing the crude sodium carbonate with an aqueous solution of soda ash or water to form a substantially saturated crude sodium carbonate solution containing coarse and fine insolubles, clarifying the crude sodium carbonate solution, passing the clarified sodium carbonate solution upwardly through an expanded carbon bed to remove organic impurities, evaporating the carbon-treated sodium carbonate solution to crystallize sodium carbonate monohydrate crystals, separating the sodium carbonate monohydrate crystals and calcining them to dense soda ash.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.