A process for recovering alkali metal hydroxide from organic...

Details A process for recovering alkali metal hydroxide from organic... A process for recovering alkali metal hydroxide from organic...

C - Chemistry, Metallurgy

01

D

C01D 1/42 (2006.01) B01J 2/14 (2006.01) C01D 1/04 (2006.01) C01G 49/00 (2006.01) D21C 11/00 (2006.01) D21C 11/04 (2006.01) D21C 11/12 (2006.01)

Patent

CA 2145853

The specification describes a process for recovering alkali metal hydroxides from an organic liquor such as black liquors derived from pulping wood chips. The organic liquor is burned in a fluidised bed combustion furnace containing fluidised parti- cles of an iron rich mixed oxide of an alkali metal and iron. Particles of alkali metal ferrite are extracted from the furnace and dissolved in a solution of alkali metal hydroxide to form a more concentrated solution of alkali metal hydroxide and a precipitate of the iron rich mixed oxides of alkali metal and iron. A mixed oxide disclosed in the specification has the following formula: - NaFe5O84H2O.

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