Baeyer’s process



Baeyer’s process:

The finely divided bauxite ore is heated with concentrated solution of sodium hydroxide in an autoclave at about 150°C. The aluminium oxide present in the ore gets dissolved in NaOH solution forming sodium aluminates. The impuritieS being insoluble separate out and removed by filtrations.

Al2O3. 2H0 + 2 NaOH     →     2 Na Al02 + 3H2O

The filtrate containing sodium aluminate solution is diluted with water, agitated and cooled. As a result a precipitate of Al(OH)3 is obtained.

Na AlO+2 2H2O         →         NaOH + Al(OH)3↓

The filtratetontaining sodium hydroxide is concentrated and used again.

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