Antimony trioxide

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  • Antimony trioxide is the inorganic compound with the formula Sb2O3.
  • It is the most important commercial compound of antimony.
  • It is found in nature as the minerals valentine and senarmontite.
  • Like most polymeric oxides, Sb2O3 dissolves in aqueous solutions only with hydrolysis.
  • The nations that produce the most antimony trioxide are china, south africa, bolivia, russia, tajikistan, and kyrgyzstan.
  • Typical applications for antimony trioxide include flame retardant synergist for use in plastics, rubber, paints, paper, textiles, and electronics
  • Polyethylene terephthalate polymerization catalyst, a clarifying agent for glass, an opacifier for porcelain and enamel, and a white pigment for paint.
  • When used as a flame retardant, antimony trioxide is often used in combination with halogenated compounds.
  • Antimony trioxide is used as a synergist to enhance the activity of the halogenated flame retardant.
  • In the absence of antimony trioxide about twice as much halogenated compound would be needed to reach the same level of flame retardancy.
  • Antimony trioxide is an amphoteric oxide, it dissolves in aqueous sodium hydroxide solution to give the meta-antimonite NaSbO2, which can be isolated as the trihydrate.
  • Antimony trioxide is made when antimony is made.
  • Stibnite is heated with air to make antimony trioxide.
  • It is separated from arsenic by the boiling of the arsenic trioxide before the antimony trioxide boils.
  • Antimony trioxide can also be made by a two step process.
  • Stibnite is burned in air with calcium chloride to make calcium sulfate and antimony trichloride, which is reacted with water to make antimony trioxide
  • Antimony trioxide also dissolves in concentrated mineral acids to give the corresponding salts, which hydrolyzes upon dilution with water.
  • With nitric acid, the trioxide is oxidized to antimony (V) oxide.
  • Antimony trioxide is mainly used as a flame retardant.
  • It is also used to make glass, enamel, and ceramic opaque (not clear).
  • Some pigments have antimony in them.
  • It is also used as a catalyst for making plastics.
  • It is also used as a catalyst for vulcanizing rubber, making it more "rubbery" and less likely to crack
  • Antimony trioxide is somewhat carcinogenic.
  • It is somewhat toxic when eaten or breathed in.
  • A high purity grade used as a catalyst in the manufacture of Polyester (PET) Chips/Fiber/Yarn.
  • Ato accelerates the rate of esterification reaction & maintains the colour of the Polymer

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