Donald R Nichols

US Patent:

42910021, Sep 22, 1981

Filed:

Oct 25, 1977

Appl. No.:

5/844847

Inventors:

Donald S. Arnold - Bethany OK
James L. Fairchild - Trona CA
Donald A. Nichols - Trona CA
Merlin D. Coe - Oklahoma City, OK

Assignee:

Kerr-McGee Chemical Corporation - Oklahoma City OK

International Classification:

C01D 700
C01D 737

US Classification:

423189

Abstract:

A process for the production of sodium carbonate wherein sodium bicarbonate is recovered from a brine containing sodium carbonate by carbonation of the brine under controlled conditions. The sodium bicarbonate is crystallized from the carbonated brine in a multi-stage carbonating, cooling and crystallization process after which it is filtered to produce wet cake. The wet cake is subjected to predrying to provide a predried wet cake of a specified free moisture content and mixed with recycle light ash to provide a dryer feed of specified moisture content to alleviate problems of product fouling or plugging of the dryer. The light ash from the dryer then is bleached and subjected to recrystallization, screening, centrifuging and drying to provide a dried sodium carbonate possessing, after evaporation of the water of hydration and free moisture, less than 0. 10 percent moisture and chemical and physical properties meeting commercial dense ash specifications.