1,3-ジベリラプロパジエン

1,3-ジベリラプロパジエン 化学特性,用途語,生産方法

• 化学的特性

  Red cubic crystal; hard and refractory; density 1.90 g/cm3; decomposes when heated above 2,100°C; reacts with water.

• 物理的性質

  Brick-red or yellowish-red octahedra. Uses: Nuclear reactor cores.

• 使用

  Beryllium carbide (Be2C) is used for the cores in nuclear reactors.

• 製造方法

  Beryllium carbide is prepared by heating the elements beryllium and carbon at elevated temperatures (above 900°C). It also may be prepared by reduction of beryllium oxide with carbon at a temperature above 1,500°C:
  2BeO + 3C → (1500℃)→ Be₂C + 2CO
  Beryllium carbide decomposes very slowly in water:
  Be₂C + 2H₂O → 2BeO + CH₄
  The rate of decomposition is faster in mineral acids with evolution of methane. However, in hot concentrated alkalies the reaction is very rapid, forming alkali metal beryllate and methane:
  Be₂C + 4NaOH → 2Na₂BeO₂ + CH₄

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