Anhydride chromic chromic acid, trioxide is lame, chromium oxide
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this compound of chrome with oxygen - crystals, scales or granules of dark red or crimson-red color with a violet shade.
Density - 2,8 g/cm ³-. Melting temperature - 196 ° - S. Gigroskopichen, blurs on air. Solubility in water - 166g/100g (15 ° - C), 199g/100g (100 ° - C). With water forms chromic acids. The strong oxidizer, can cause ignition of paper, alcohol. It is poisonous.
Chemical formula: CrO3
Depending on appointment chromic anhydride is let out brands A, B and B.
It is widely applied in machine-building, metallurgical, chemical, petrochemical and other industries for:
- productions of metal chrome of high purity, supersolid materials, some catalysts for processes of chromium plating, chromatizing and passivating (brand A).
- productions of electrolytic chrome, production of catalysts (brand B).
- productions of molding as a part of forming and rod mixes, for processes of etching and others are more whole (brand B).
It is applied also as an oxidizer in organic chemistry (in production of an izatin, indigo, etc.). In mix with diatomaceous earth it is applied to purification of acetylene under the name "-epurit"-.
Physical and chemical indicators of chromic anhydride
|Name of an indicator||Norm for brand|