Preparation of high bulk density anhydrous sodium carbonate crystals
A process for preparing pure anhydrous sodium carbonate crystal from impure purge liquor obtained from calcined trona via the monohydrate process and containing silica, organic material and sulfate impurities, is described comprising the steps of (1) treating the purge liquor with magnesium oxide and by the addition of an effective amount and up to about 2 percent sodium bicarbonate; (2) separating the insoluble reaction product from the mother liquor; (3) adding soluble calcium and magnesium salts to the separated mother liquor; (4) evaporating the treated resulting solution from step (3) to yield sodium carbonate monohydrate crystals; (5) separating the formed crystals from the mother liquor; and (6) heating the crystals thus derived to a temperature of at least about 140/sup 0/C. to convert the crystals to a dense sodium carbonate product.
- Assignee:
- General Chemical Corp., Parsippany, NJ
- Patent Number(s):
- US 4738836
- OSTI ID:
- 6950993
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360603 -- Materials-- Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BULK DENSITY
CALCIUM CHLORIDES
CALCIUM COMPOUNDS
CALCIUM HALIDES
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTION YIELD
CHLORIDES
CHLORINE COMPOUNDS
CRYSTALLIZATION
CRYSTALS
DENSITY
EVAPORATION
HALIDES
HALOGEN COMPOUNDS
HEATING
HYDRATES
IMPURITIES
MAGNESIUM CHLORIDES
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SODIUM CARBONATES
SODIUM COMPOUNDS
SULFATES
SULFUR COMPOUNDS
SYNTHESIS
YIELDS