ベリリウムジフルオリド

危険有害性情報のコード(GHS)

• 絵表示(GHS)

  

• 注意喚起語

  Danger

• 危険有害性情報

  H301：飲み込むと有毒

  H311：皮膚に接触すると有毒

  H314：重篤な皮膚の薬傷?眼の損傷

  H330：吸入すると生命に危険

  H350：発がんのおそれ

  H372：長期にわたる、または反復暴露により臓器の障 害

  H411：長期的影響により水生生物に毒性

• 注意書き

  P260：粉じん/煙/ガス/ミスト/蒸気/スプレーを吸入しないこ と。

  P264：取扱い後は皮膚をよく洗うこと。

  P264：取扱い後は手や顔をよく洗うこと。

  P270：この製品を使用する時に、飲食または喫煙をしないこ と。

  P271：屋外または換気の良い場所でのみ使用すること。

  P280：保護手袋/保護衣/保護眼鏡/保護面を着用するこ と。

  P284：呼吸用保護具を着用すること。

  P301+P310：飲み込んだ場合：直ちに医師に連絡すること。

  P301+P330+P331：飲み込んだ場合：口をすすぐこと。無理に吐かせ ないこと。

  P302+P352：皮膚に付着した場合：多量の水と石鹸で洗うこと。

  P303+P361+P353：皮膚（または髪）に付着した場合：直ちに汚染された衣 類をすべて脱ぐこと/取り除くこと。皮膚を流水/シャワー で洗うこと。

  P304+P340：吸入した場合：空気の新鮮な場所に移し、呼吸しやすい 姿勢で休息させること。

  P305+P351+P338：眼に入った場合：水で数分間注意深く洗うこと。次にコ ンタクトレンズを着用していて容易に外せる場合は外す こと。その後も洗浄を続けること。

  P310：ただちに医師に連絡すること。

  P312：気分が悪い時は医師に連絡すること。

  P314：気分が悪い時は、医師の診断/手当てを受けること。

  P320：特別な治療が緊急に必要である（このラベ ルの．．．を見よ）。

  P321：特別な処置が必要である（このラベルの．．． を見よ）。

  P322：特別な処置が必要である（このラベルの．．． を見よ）。

  P330：口をすすぐこと。

  P361：汚染された衣類をすべて脱ぐこと。

  P363：汚染された衣類を再使用す場合には洗濯をすること。

  P403+P233：換気の良い場所で保管すること。容器を密閉 しておくこと。

  P405：施錠して保管すること。

  P501：内容物/容器を．．．に廃棄すること。

ベリリウムジフルオリド 化学特性,用途語,生産方法

• 用途

  ベリリウム，ベリリウム合金の原料，原子炉の減速剤

• 説明

  Beryllium fluoride has the formula, BeF2, and is a hygroscopic, amorphous solid with a melting point of 800°C. It is soluble in water and is used in beryllium metallurgy in which the metal, Be, is employed as an alloy. Solid crystalline BeF2 has a silica-like structure with beryllium in a four-coordinate position.

• 化学的特性

  Beryllium fluoride is readily soluble in water, dissolving in its own water of hydration as BeF2·2H2O. The compound cannot be crystallized from solution and is prepared by thermal decomposition of ammonium fluoberyllate, (NH4)2BeF4.

• 物理的性質

  Glassy solid; tetragonal crystal system; hygroscopic; density 2.1 g/cm³; melts BERYLLIUM FLUORIDE 101 at 552°C; vaporizes at 1,169°C; very soluble in water; sparingly soluble in alcohol.

• 使用

  Beryllium fluoride is used in biochemistry, particularly protein crystallography, since it binds in some of the same ways as phosphate does in human tissues. ADP and beryllium fluoride together tend to bind to ATP sites and inhibit protein action, making it possible to crystallize proteins in the bound state. Beryllium fluoride forms a basic constituent of the preferred fluoride salt mixture used in liquid-fluoride nuclear reactors. Typically, beryllium fluoride is mixed with LiF to form a base solvent, into which fluorides of uranium and thorium are introduced. Beryllium fluoride is exceptionally chemically stable and LiF/BeF2 mixtures have low melting points and the best neutronic properties of any of the fluoride salt combinations appropriate for reactor use.

• 定義

  ChEBI: The fluoride salt of beryllium (+2 oxidation state). In the solid state it exists as a glass, with four-coordinate Be2+ tetrahedral centres and two-coordinate fluoride centres. As a gas it adopts a linear triatomic structure and in the liquid state a fluctuating tetrahedral structure. In protein crystallography it is used as a mimic of phosphate.

• 製造方法

  Beryllium fluoride is made by thermal decomposition of ammonium beryllium fluoride at 900 to 950°C.

• Manufacturing Process

  First, beryllium hydroxide is dissolved in an ammonium hydrogen fluoride solution. The resulting ammonium tetrafluoroberyllate is dissociated to a small extent in the solution that the pH can be varied over a wide range without precipitating beryllium hydroxide. Impurities can thus be precipitated relatively easily as hydroxides. Aluminum is precipitated as hydroxide by increasing the pH to 8.3. Chromium and manganese are precipitated by oxidation with lead dioxide, and manganese is precipitated by oxidation with lead dioxide and manganese dioxide. Copper, nickel, and lead are precipitated as sulfides. Ammonium tetrafluoroberyllate is freely soluble in water. When concentrated by evaporation, it crystallizes without water or hydration. Above 130 ?C, it dissociates into ammonium fluoride and beryllium fluoride. Between 900 and 1100 ?C, ammonium tetrafluoroberyllate dissociates into gaseous beryllium fluoride and gaseous ammonium fluoride. The latter can be recycled into the process as ammonium hydrogen fluoride by dissolving it in aqueous hydrogen fluoride. Cooling produces beryllium fluoride as vitreous grains.

• 一般的な説明

  Odorless white solid. Denser than water.

• 空気と水の反応

  Water soluble.

• 反応プロフィール

  Beryllium fluoride is incompatible with the following: Acids, caustics, chlorinated hydrocarbons, oxidizers, magnesium, molten lithium .

• 危険性

  A known carcinogen. Toxic by inhalation and ingestion.

• 健康ハザード

  Any dramatic weight loss should be considered as possible first indication of beryllium disease. Inhalation causes irritation of nose, throat, and lungs, severe pneumonitis, and/or pulmonary edema. Ingestion causes fatigue, weakness, loss of appetite. Contact with eyes causes severe irritation and burns. Contact with skin causes dermatitis and non-healing ulcers.

• 火災危険

  Special Hazards of Combustion Products: Toxic and irritating vapor of unburned material may form in fire.

• 化学性质

  融点555℃，吸湿性，水に易溶

• 安全性プロファイル

  Confirmed carcinogen withexperimental carcinogenic and tumorigenic data byinhalation. Poison by ingestion, subcutaneous,intravenous, and intraperitoneal routes. Incompatible with Mg. When heated to decomposition, itemits very toxic fumes of BeO and F

• 合成方法

  炭酸ベリリウムとフッ化水素との反応，またはテトラフルオロベリリウム酸アンモニウム（NH4）2BeF4を炭酸ガス中で赤熱して得る

• 参考文献

  A.F. Wright, A.N. Fitch, A.C. Wright, J. Solid State Chem., 73, 298 (1988), DOI: 10.1016/0022-4596(88)90113-2.

ベリリウムジフルオリド 生産企業

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