Product performance and production principle of dipotassium 2-naphthol-6,8-disulfonate

2-naphthol -6, 8-disulfonic acid dipotassium salt (2-naphthol-6, 8-disulfonic acid dipotassium salt), also known as G acid dipotassium salt, G salt, G acid Dipotassium, the molecular formula is C ₁₀ H ₆ K ₂ O ₇ S ₂ , the molecular weight is 380.

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White needle-like crystals

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2-Naphthol is sulfonated with fuming sulfuric acid, the sulfonate is diluted, and the G acid is salted out with potassium chloride to precipitate the G acid into dipotassium salt.

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Sulfonation pot, salting out pot, storage tank, filter press

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In the sulfonation pot, add 100% sulfuric acid prepared from fuming sulfuric acid and 98% sulfuric acid, stir and cool to 10-15°C, gradually add 2-naphthol, and control the temperature not to exceed 40°C

Add potassium chloride and the washing liquid from the previous batch to the salting-out pot, and add water to adjust the volume

Related links: Product standards and uses of 1-naphthol-4-sulfonic acid