Specification: Slice 99, 96; Grain of alkali 99, 96.
Appearance: Slice, grain, solid alkali.
Detailed introduction to Sodium Hydroxide:
Molecular formula: NaOH
Molecular weight: 40.01
Physical Property: Melting point 318.4 degrees Celsius, boiling point 1390 degrees Celsius, relative density 2.130.
Chemical properties: Solubility soluble in water and heat. And soluble in ethanol and glycerin, Insoluble in acetone, either. Dew on the air, finally will completely dissolved into solution.
Transport or Storage: Storage note, large contact should wear protective appliances caustic soda.
Usage: A wide range of uses, chemical, pharmaceutical, food, metal surface treatment, metallurgy, petroleum refining, papermaking, printing and dyeing, glass, leather, enamel, etc are applied.
Production process:
(1) filtering seawater
(2) to remove excess sodium hydroxide, calcium and magnesium ions, filter
Ca2+ +2OH- =Ca(OH)₂ (slightly soluble)
Mg2+ +2OH- =Mg(OH)₂
(3) using reverse osmosis membrane production technology in the brine ₂ SO4 (out) -
(4) add, remove excess calcium ions, sodium carbonate ions, filtering. Excess barium
Ca2+ +CO₃2- =CaCO₃
Ba2+ +CO₃2- =BaCO₃
(5) stir-in hydrochloric acid, remove excess carbonate ions
2H+ +CO₃(₂-) =CO₂+H₂O
(6) heating drive CO₂
(7) into the ion exchange, further removes calcium, magnesium ions
(8) electrolysis
Features: Eight kinds of dangerous goods, strong corrosive, freight cargo than ordinary high, if the customer does not require, no tray. When air into the water, so is open, and which can send the samples as acid glacial acetic acid.
Other: Have strong corrosive, can make up water, desiccant.