Production of sodium bicarbonate by reversion of soda-type feed salt
US4654204A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 1985 |
| Grant date | Mar 31, 1987 |
| Priority date | — |
| Expiry date | Jul 16, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01D7/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Sodium bicarbonate is produced by introducing solid sodium carbonate, sodium sesquicarbonate, and/or Wegscheider's salt into a reversion slurry, saturated with respect to bicarbonate and containing at least 10 wt. % solids, to effect rapid and complete conversion of the feed solids to crystalline sodium bicarbonate which is recovered from the slurry. Carbon dioxide is introduced into the reversion liquor to maintain its composition at a relatively constant value, preferably in a region of the Na.sub.2 CO.sub.3 --NaHCO.sub.3 --H.sub.2 O phase diagram that minimizes the equilibrium partial pressure of CO.sub.2 vapor above such liquor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.