Preparation Potassium sodium tartrate

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large rochelle salt crystal grown aboard skylab


the starting material tartar minimum tartaric acid content 68 %. first dissolved in water or in mother liquor of previous batch. saponified hot caustic soda ph 8, decolorized activated charcoal, , chemically purified before being filtered. filtrate evaporated 42 °bé @ 100 °c, , passed granulators in seignette s salt crystallizes on slow cooling. salt separated mother liquor centrifugation, accompanied washing of granules, , dried in rotary furnace , sieved before packaging. commercially marketed grain sizes range 2000 μm < 250 μm (powder).


larger crystals of rochelle salt have been grown under conditions of reduced gravity , convection on board skylab .








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