Back to results
US 4,001,381 AGranted
Manufacturing process for heavy sodium carbonates in briquette form
AssigneeUzina De Produse Sodice
InventorsAurelian M. Dascalescu, Grigore O. Socolescu
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeUzina De Produse Sodice
InventorsAurelian M. Dascalescu, Grigore O. Socolescu
Estimating the term…
The invention is a heavy sodium carbonate -dense soda- in the form of briquettes, having great density, and includes also the commercial forms of heavy sodium carbonate in the form of powder, grains and briquettes, which products are obtained by grinding - or not as required - the briquettes. The invention also comprises a novel process which produces these briquettes by briquetting of the dry sodium bicarbonate from the SOLVAY or TRONA soda ash fabrication process, which after filtering or centrifuging and drying is briquetted at a pressure between 500 to 1000 kg/cm.sup.2 ; the briquettes with a density of 1.8 kg/dm.sup.3, are then introduced into a heated static space at 700.degree. to 750.degree. C., and maintained there until the bicarbonate briquettes turn into dense sodium carbonate briquettes, with a density of 2.2 - 2.4 kg/dm.sup.3.
A process for the manufacture of heavy sodium carbonate briquettes, which comprises the steps of drying a raw, light sodium carbonate - forming starting substance selected from the group consisting of sodium bicarbonate and a mixture of sodium sesquicarbonate and sodium carbonate monohydrate to a 2-4% moisture content, subjecting the thus-dried starting substance to a pressure of about 800 kg/cm.sup.2 to produce briquettes of the same starting substance having a density of approximately 1.8 kg/dm.sup.3, and then calcining the thus-formed dense briquettes of the starting substance in a closed space heated to a temperature of 700.degree.-750.degree. C for a time period sufficient to convert the dense briquettes of said starting substance into briquettes of heavy sodium carbonate having a density of 2.2-2.4 kg/dm.sup.3 and to simultaneously evolve a dust-free gas mixture of CO.sub.2 and H.sub.2 O vapors.
Dependencies are inferred from the claim text.