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Sodium hydroxide (caustic soda), solid is a white and solid (flakes). Sodium hydroxide, also known as lye and caustic soda, is an inorganic compound with formula Noah. It is a white solid ionic compound consisting of sodium. Sodium hydroxide is a highly caustic base and alkali,that decomposes proteins at ordinary ambient temperatures and may cause severe chemical burns. Use in many industries like chemical manufacturing, petroleum refining, cleaning compounds, drain cleaners. White or nearly white pellets, flakes, sticks, fused masses or other forms. Solutions are clear or slightly turbid, colorless or slightly coloured, strongly caustic and hygroscopic and when exposed to the air they absorb carbon dioxide, forming sodium carbonate. Sodium hydroxide is formed from sodium sulphate by a three step operation comprising converting the sodium sulphate to sodium sulphide, converting the sodium sulphide to sodium bicarbonate, and converting the sodium bicarbonate to sodium hydroxide. The operations preferably are effected in conjunction with a bleached kraft pulp mill operation, so as to utilize by-product sodium sulphate from chlorine dioxide generation to produce useful sodium hydroxide as sulphur without co-producing chlorine.