15678

Boric anhydride

puriss. p.a., ≥98% (T)

• Sinonimo/i: Boron trioxide
• Formula empirica (notazione di Hill): B₂O₃
• Numero CAS: 1303-86-2
• Peso molecolare: 69.62
• Numero CE: 215-125-8
• Numero MDL: MFCD00011315
• Codice UNSPSC: 12352300
• ID PubChem: 57647516
• NACRES: NA.21

Proprietà

• Densità del vapore: >1 (vs air)
• Livello qualitativo: 100
• Grado: puriss. p.a.
• Saggio: ≥98% (T)
• Forma fisica: solid
• Perdita: ≤3% loss on ignition, 900 °C
• Punto di fusione: 450 °C (lit.)
• Densità: 2.46 g/mL at 25 °C (lit.)
• Anioni in tracce: chloride (Cl^-): ≤20 mg/kg; sulfate (SO₄^2-): ≤50 mg/kg
• Cationi in tracce: Ag: ≤5 mg/kg; Al: ≤50 mg/kg; Ba: ≤5 mg/kg; Bi: ≤5 mg/kg; Ca: ≤10 mg/kg; Cd: ≤5 mg/kg; Co: ≤5 mg/kg; Cr: ≤5 mg/kg; Cu: ≤5 mg/kg; Fe: ≤5 mg/kg; K: ≤30 mg/kg; Mg: ≤20 mg/kg; Mn: ≤5 mg/kg; Mo: ≤5 mg/kg; Na: ≤200 mg/kg; Ni: ≤5 mg/kg; Pb: ≤30 mg/kg; Sr: ≤5 mg/kg; Tl: ≤10 mg/kg; Zn: ≤5 mg/kg
• Stringa SMILE: O=BOB=O
• InChI: 1S/B2O3/c3-1-5-2-4; JKWMSGQKBLHBQQ-UHFFFAOYSA-N

Descrizione

Descrizione generale

Boric anhydride (Boron trioxide) is a colorless glassy hygroscopic mass having rhombic crystals. Its dissolution in water is a highly exothermic reaction and orthoboric acid is formed. It can be prepared by heating boric acid. It is used as flux in metallurgical processes. It has been reported as an inhibitor of crystallization.

Applicazioni

Boric anhydride can be used as a boron precursor to synthesize:

• Boron carbon nitride nanosheet (BCN) by thermal condensation reaction with urea and melamine.
• Boron-doped reduced graphene oxide (B-rGO) via a chemical vapor deposition method.

It can also be used as an additive along with pinacol to synthesize 4-alkoxy-5-hydroxy-2-pentenoate derivatives by Pd-catalyzed reaction of α, β-unsaturated γ, δ-epoxy esters with various alcohols.

Altre note

Reagent for the decomposition of silicates by fusion

Informazioni sulla sicurezza

• Pittogrammi: GHS08
• Avvertenze: Danger
• Indicazioni di pericolo: H360FD
• Consigli di prudenza: P201 - P202 - P280 - P308 + P313 - P405 - P501
• Classi di pericolo: Repr. 1B
• Codice della classe di stoccaggio: 6.1D - Non-combustible acute toxic Cat.3 / toxic hazardous materials or hazardous materials causing chronic effects
• Classe di pericolosità dell'acqua (WGK): WGK 1
• Punto d’infiammabilità (°F): Not applicable
• Punto d’infiammabilità (°C): Not applicable
• Dispositivi di protezione individuale: dust mask type N95 (US), Eyeshields, Gloves