基本的な属性 MSDS 用途と合成の方法 サプライヤー

ベンゼン [アミノ酸配列分析用]

基本的な属性 MSDS 用途と合成の方法 サプライヤー
ベンゼン [アミノ酸配列分析用]
ベンゼン [アミノ酸配列分析用] 性質
  • 融点 5.5 °C(lit.)
  • 沸点 80 °C(lit.)
  • 比重(密度) 0.874 g/mL at 25 °C(lit.)
  • 蒸気密度2.77 (vs air)
  • 蒸気圧166 mm Hg ( 37.7 °C)
  • 屈折率 n20/D 1.501(lit.)
  • 闪点 12 °F
  • 貯蔵温度  0-6°C
  • 溶解性Miscible with alcohol, chloroform, dichloromethane, diethyl ether, acetone and acetic acid.
  • 酸解離定数(Pka)43(at 25℃)
  • 外見 Liquid
  • APHA: ≤10
  • Relative polarity0.111
  • 爆発限界(explosive limit)1.4-8.0%(V)
  • 水溶解度 0.18 g/100 mL
  • Merck 14,1066
  • BRN 969212
  • 安定性:Stable. Substances to be avoided include strong oxidizing agents, sulfuric acid, nitric acid, halogens. Highly flammable.
  • CAS データベース71-43-2(CAS DataBase Reference)
  • NISTの化学物質情報Benzene(71-43-2)
  • EPAの化学物質情報Benzene(71-43-2)
セキュリティ情報
MSDS Information
ベンゼン [アミノ酸配列分析用] 用途と合成の方法
  • 化学的特性Benzene,C6H6, also known as benzol, phenyl hydride, phene, cyclohexatriene and coal naptha,is a colorless,flammable liquid. It is an aromatic hydrocarbon that boils at 80.1 DC. It is used as a solvent and an intermediate in manufacturing organic compounds such as styrene and phenol.
  • 定義ChEBI: A six-carbon aromatic annulene in which each carbon atom donates one of its two 2p electrons into a delocalised pi system. A toxic, flammable liquid byproduct of coal distillation, it is used as an industrial solvent. Benzene is a carcinogen that also damages bone marrow and the central nervous system.
  • 一般的な説明A clear colorless liquid with a petroleum-like odor. Flash point less than 0°F. Less dense than water and slightly soluble in water. Hence floats on water. Vapors are heavier than air.
  • 空気と水の反応Highly flammable. Slightly soluble in water.
  • 反応プロフィールBenzene reacts vigorously with allyl chloride or other alkyl halides even at minus 70°C in the presence of ethyl aluminum dichloride or ethyl aluminum sesquichloride. Explosions have been reported [NFPA 491M 1991]. Ignites in contact with powdered chromic anhydride [Mellor 11:235 1946-47]. Incompatible with oxidizing agents such as nitric acid. Mixtures with bromine trifluoride, bromine pentafluoride, iodine pentafluoride, iodine heptafluoride and other interhalogens can ignite upon heating [Bretherick 5th ed. 1995]. Benzene and cyanogen halides yield HCl as a byproduct (Hagedorn, F. H. Gelbke, and Federal Republic of Germany. 2002. Nitriles. In Ullman Encyclopedia of Industrial Chemistry. Wiley-VCH Verlag GmbH & Co. KGaA.). The reaction of Benzene and trichloroacetonitrile evolves toxic chloroform and HCl gasses. (Hagedorn, F., H.-P. Gelbke, and Federal Republic of Germany. 2002. Nitriles. In Ullman Encyclopedia of Industrial Chemistry. Wiley-VCH Verlag GmbH & Co. KGaA.).
  • 健康ハザードDizziness, excitation, pallor, followed by flushing, weakness, headache, breathlessness, chest constriction, nausea, and vomiting. Coma and possible death.
  • 火災危険Behavior in Fire: Vapor is heavier than air and may travel considerable distance to a source of ignition and flash back.
  • 純化方法For most purposes, *benzene can be purified sufficiently by shaking with conc H2SO4 until free from thiophene, then with H2O, dilute NaOH and water, followed by drying (with P2O5, sodium, LiAlH4, CaH2, 4X Linde molecular sieve, or CaSO4, or by passage through a column of silica gel, and for a preliminary drying, CaCl2 is suitable), and distillation. A further purification step to remove thiophene, acetic acid and propionic acid, is crystallisation by partial freezing. The usual contaminants in dry thiophene-free *benzene are non-benzenoid hydrocarbons such as cyclohexane, methylcyclohexane, and heptanes, together with naphthenic hydrocarbons and traces of toluene. Carbonyl-containing impurities can be removed by percolation through a Celite column impregnated with 2,4-dinitrophenylhydrazine, phosphoric acid and H2O. (Prepared by dissolving 0.5g DNPH in 6mL of 85% H3PO4 by grinding together, then adding and mixing 4mL of distilled H2O and 10g Celite.) [Schwartz & Parker Anal Chem 33 1396 1961.] *Benzene has been freed from thiophene by refluxing with 10% (w/v) of Raney nickel for 15minutes, after which the nickel is removed by filtration or centrifugation. Dry *benzene is obtained by doubly distilling high purity *benzene from a solution containing the blue ketyl formed by the reaction of sodium-potassium alloy with a small amount of benzophenone. Thiophene has been removed from *benzene (absence of bluish-green coloration when 3mL of *benzene is shaken with a solution of 10mg of isatin in 10mL of conc H2SO4) by refluxing the *benzene (1.25L) for several hours with 40g HgO (freshly precipitated) dissolved in 40mL glacial acetic acid and 300mL of water. The precipitate is filtered off, the aqueous phase is removed and the *benzene is washed twice with H2O, dried and distilled. Alternatively, *benzene dried with CaCl2 has been shaken vigorously for 0.5hour with anhydrous AlCl3 (12g/L) at 25-35o, then decanted, washed with 10% NaOH, and water, dried and distilled. The process is repeated, giving thiophene-free *benzene. [Holmes & Beeman Ind Eng Chem 26 172 1934.] After shaking successively for about an hour with conc H2SO4, distilled water (twice), 6M NaOH, and distilled water (twice), *benzene is distilled through a 3-ft glass column to remove most of the water. Absolute EtOH is added and the *benzene-alcohol azeotrope is distilled. (This low-boiling distillation leaves any non-azeotrope-forming impurities behind.) The middle fraction is shaken with distilled water to remove EtOH, and again redistilled. Final slow and very careful fractional distillation from sodium, then LiAlH4 under N2, removed traces of water and peroxides. [Peebles et al. J Am Chem Soc 82 2780 1960.] *Benzene liquid and vapour are very TOXIC and HIGHLY FLAMMABLE, and all operations should be carried out in an efficient fume cupboard and in the absence of naked flames in the vicinity. [Beilstein 5 H 175, 5 I 95, 5 II 119, 5 III 469.] Rapid purification: To dry benzene, alumina, CaH2 or 4A molecular sieves (3% w/v) may be used (dry for 6hours). Then benzene is distilled, discarding the first 5% of distillate, and stored over molecular sieves (3A, 4A) or Na wire.
  • 用途分解ガソリン等から抽出される芳香族炭化水素で、スチレン、フェノール、シクロヘキサン等の原料として使用される他、各種化学品の原料、溶剤等に使用されます。
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