Patent ID: 6270740
Filing Date: 2001-08-07
Classification: C01D

Abstract:
A method for making sodium carbonate crystals from a natural source consisting essentially of the following steps in sequence:(a) crushing and calcining a natural sodium carbonate-containing product;(b) dissolving the calcined product in water;(c) decanting the resultant supernatant liquid from solid residues;(d) adding a cationic amine compound to the supernatant liquid from step (c) substantially continuously at a rate of about 0.017-0.21 gallons per ton of sodium carbonate produced to react with organic materials in the supernatant to form solid polymeric by-products;(e) filtering to remove the by-product from the supernatant liquid; and(f) crystallizing the supernatant liquid of step e) to obtain sodium carbonate crystals.