Description Caustic Soda is a versatile basic chemical with a wide range of industrial applications. It is highly soluble in water and is practically insoluble in most organic solvents except alcohols. It is available in the form of lye (solution in water). Applications Digestion of wood and bagasse for the manufacture of pulp and paper. Digestion of wood for the manufacture of viscose staple fibre, viscose filament yarn and rayon tyre cord. Manufacture of soaps and detergents. Digestion of aluminium ore to make alumina as an intermediate in the production of aluminium. Bleaching & processing of cotton textiles. Regeneration of ion-exchange resins in water treatment plant Properties; 1. Specific gravity 2.13 2. Odour Odourless 3. Melting point (calcination) 320°C 4. Boiling point 1390°C 5. Hygroscopicity Hygroscopic and deliquescent 6. Solubility in water Highly soluble 7. Solubility in organic solvents Solubles in ethanol, methanol, glycerol etc but insoluble in ether and benzene Specifications; Property Rayon Grade as per IS:252:1991 Caustic Soda Lye Flakes General appearance Free from foreign matter Clear, colourless liquid White Flakes Sodium Hydroxide concentration – 47.5 0.2% 98% Purity (on dry basis) 99.5% min 99.6% 99.6% Sodium Carbonate content 0.40% max. 0.30% 0.30% – 0.35% Chloride content (as NaCl) 0.10% max. 0.03% 0.03% Sulphate content (as Na2SO4) 0.10% max. Traces Traces Iron (as Fe) ppm 20 max. 10 max 10-15 Copper (as Cu) ppm 2 max. Not detectable Not detectable Manganese (as Mn) ppm 1 max. Not detectable Not detectable Matter insoluble in water % 1% max. Nil Nil Packaging Caustic soda (Lye) is supplied in lorry tankers, Caustic Soda Solid is packaged in MS drums, and Caustic Soda Flakes are marketed in 50 Kg HDPE bags. Handling and Storage Caustic Soda is a highly corrosive substance and requires careful handling. There should be no contact with bare skin. Caustic Soda flakes should be stored under dry conditions away from acids, organic chemicals, metals such as aluminium, tin, zinc, lead etc. and their alloys. Packaging Caustic Soda Flakes, Min 99.5% Purity x1kg Related
