Process for sodium carbonate crystals from solutions

Details Process for sodium carbonate crystals from solutions Process for sodium carbonate crystals from solutions

2006-09-08

2010-02-02

Johnson, Edward M (Department: 1793)

Chemistry: physical processes

Physical processes

Crystallization

C423S421000

Reexamination Certificate

active

07655053

ABSTRACT:
A method of producing sodium carbonate from any solution or carbonate mineral, especially trona, that includes: removing calcium and magnesium compounds from an input solution; passing the input solution to a precipitator, adding methanol of 30% to 70% by volume to the solution in the precipitator so as to precipitate carbonate from the solution, washing the precipitated carbonate with a methanol-containing solution, and drying the washed precipitated crystals at low temperatures. The present invention provides a refined technique for reducing impurities and increasing efficiency of the process whereby sodium carbonate crystals can be formed of various sizes, shapes, densities and distributions by adjusting various parameters of the process. The sodium carbonate crystals produced from the process may originate from an input solution comprised of calcined-sodium carbonate solution, tailing pond water, waste pond water, sesquicarbonate or uncalcined trona solution, or from various mixtures of carbonates and bicarbonates.

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patent: 6022385 (2000-02-01), Bowman
patent: 6514475 (2003-02-01), Oosterhof et al.

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