ChemicalBook
Chinese english Germany Korea

ネオン

ネオン 化学構造式
7440-01-9
CAS番号.
7440-01-9
化学名:
ネオン
别名:
ネオン;ネオンガス;Neガス
英語化学名:
NEON
英語别名:
10Ne;NEON;neongas;neon(0);neon atom;liquidneon;neonliquid;neonliquide;Chebi:33310;NEON, 99.99+%
CBNumber:
CB3415919
化学式:
Ne
分子量:
20.18
MOL File:
7440-01-9.mol

ネオン 物理性質

融点 :
-248.67 °C(lit.)
沸点 :
−246 °C(lit.)
比重(密度) :
0.9002(0℃)
蒸気密度:
0.7 (21 °C, vs air)
外見 :
colorless gas
水溶解度 :
10.5mL/100g H2O (20°C, 101.32kPa) [KIR78]; Henry’s law constants, k×10?4: 13.023 (70.0°C), 12.022 (124.5°C), 9.805 (174.5°C), 7.166 (226.4°C), 4.160 (283.7°C) [POT78]
Merck :
13,6483
安定性::
Stable. Very unreactive.
EPAの化学物質情報:
Neon (7440-01-9)

安全性情報

Sフレーズ  38
RIDADR  UN 1065 2.2
WGK Germany  3
RTECS 番号 QP4450000
4.5-31
DOT Classification 2.2 (Nonflammable gas)
国連危険物分類  2.2
有毒物質データの 7440-01-9(Hazardous Substances Data)

ネオン 価格

メーカー 製品番号 製品説明 CAS番号 包装 価格 更新時間 購入

ネオン 化学特性,用途語,生産方法

解説

Ne.原子番号10の元素.電子配置[He]2s22p6の周期表18族希ガス元素の一つ.原子量20.1797(6).質量数20(90.48(3)%),21(0.27(1)%),22(9.25(3)%)の3種の安定同位体と,質量数16~32,34の放射性同位体が知られている.1898年にW. Ramsay(ラムゼー)とM.W. Traversにより,液体空気中に発見され,ギリシア語の“新しい”を意味するνεο"(neos)から命名された.大気中に65000:1の割合で微量存在し,液体空気の分留により得られる.無色,無臭の気体.融点24.48 K,沸点27.10 K.臨界定数44.49 K,2.6786 MPa,0.48192 g mL-1.液体の密度1.2070 g cm-3(沸点).蒸発熱(沸点)1.7326 kJ mol-1.第一イオン化エネルギー21.564 eV.化学的には不活性である.普通の意味の化合物はフッ化物を含め,まだ確認されていない.理論的にも存在は疑問視されている.低圧放電により赤橙色に強く光るので,ネオンサイン用にもっとも多く用いられる.そのほか,指示灯,電子管用充填ガス,冷媒などとして用いられる.[CAS 7440-01-9]
森北出版「化学辞典(第2版)

説明

In 1898, Dr William Ramsay and Morris M. Travers, a Scottish scientist and a British scientist, respectively, discovered neon as a condensation product in liquefied air, as in a process similar to that used to collect neon today. Neon’s use in lighting evolved from discoveries that gases under low pressure conduct electricity. When some flowing electrons collide with residual gas in an evacuated glass tube, the resulting ions emit light as they return to their nonexcited state. The color of the light depends on the residual gas; neon gas produces a red color and argon, another inert gas often used in tubes (which are frequently and incorrectly called neon lights), produces a blue color. These two basic colors are often modified into many different hues by the addition of such elements as mercury and cadmium. The neon found on the Earth is considered to be primordial in origin. Most of the neon is sequestered in the Earth’s rocks or dissolved in water, with small amounts escaping into the atmosphere during geologic weathering. The escaped gas is slowly lost into space faster than it is replenished. Consequently, neon constitutes only a small part (0.0018%) of the Earth’s atmosphere, although this element is estimated to be the fourth most abundant in the universe.

化学的特性

colourless odourless gas

化学的特性

Neon is an inert, colorless, odorless, tasteless gas or liquid.

物理的性質

Neon is a monatomic atom that is considered relatively inert. It does not even combinewith itself to form a diatomic molecule, as do some other gases (e.g., H2 and O2). Duringthe 1960s it was discovered that the noble gases are not really inert. Neon and the heaviernoble gases (Kr, Xe, and Rn) can form compounds when in an ionized state with some otherelements. For example, neon can form a two-atom ionized molecule of NeH+. Neon has alsobeen forced to form a compound with fluorine.
Neon’s melting point is –248.59°C, its boiling point is –246.08°C, and its density is0.0008999 g/cm3.

同位体

There are a total of 11 isotopes of neon, three of which are stable. They are Ne-20, which makes up 90.48% of the natural abundance of neon on Earth; Ne-21, whichcontributes just 0.27% to all the neon found in nature; and Ne-22, which contributes9.25% to the natural abundance of neon. All the other isotopes have half-lives rangingfrom 3.746×10-21 seconds to 3.38 minutes.

名前の由来

The word “neon” was derived from the Greek word neos, meaning “new.”

天然物の起源

Neon is the fourth most abundant element in the universe, but it makes up only 18.18ppm of the Earth’s atmosphere. It is the 82nd most abundant element on Earth.
Neon is believed to be produced by radioactive decay deep in the Earth. As it rises to thesurface, it escapes into the atmosphere and is soon dissipated. Some neon is found mixed withnatural gas and several minerals.
Neon is produced as a secondary product of the fractional distillation of liquid nitrogenand oxygen. Air is liquefied, and as it warms, nitrogen and oxygen boil off, leaving behindseveral other colder gases, including about 75% neon, which is then passed through activatedcharcoal to remove hydrogen and other gases.

特性

As with the other noble gases, neon is colorless, tasteless, and odorless. It glows bright redwhen electricity is passed through it in an enclosed glass tube. It will turn from a gas to a liquidat –245.92°C, and only under great pressure will it become solid. It is noncombustible andlighter than air, but not as light as helium.

来歴

Discovered by Ramsay and Travers in 1898. Neon is a rare gaseous element present in the atmosphere to the extent of 1 part in 65,000 of air. It is obtained by liquefaction of air and separated from the other gases by fractional distillation. Natural neon is a mixture of three isotopes. Fourteen other unstable isotopes are known. It is very inert element; however, it is said to form a compound with fluorine. It is still questionable if true compounds of neon exist, but evidence is mounting in favor of their existence. The following ions are known from optical and mass spectrometric studies: Ne+, (NeAr)+, (NeH)+, and (HeNe+). Neon also forms an unstable hydrate. In a vacuum discharge tube, neon glows reddish orange. Of all the rare gases, the discharge of neon is the most intense at ordinary voltages and currents. Neon is used in making the common neon advertising signs, which accounts for its largest use. It is also used to make high-voltage indicators, lightning arrestors, wave meter tubes, and TV tubes. Neon and helium are used in making gas lasers. Liquid neon is now commercially available and is finding important application as an economical cryogenic refrigerant. It has over 40 times more refrigerating capacity per unit volume than liquid helium and more than three times that of liquid hydrogen. It is compact, inert, and is less expensive than helium when it meets refrigeration requirements. Neon costs about $800/80 cu. ft. (2265 l).

使用

Gas in neon light tubes; ingredient of gaseous fillers for antifog devices, warning signals, electrical current detectors, high-voltage indicators for high-tension electric lines, lightning arresters, wave-meter tubes; in Ne-He lasers; in mixtures with He and Ar in Geiger counters. Liquid as cryogen to produce low temperetures.

使用

The most common use of neon is in the manufacture of luminescent electric tubes andspecialty high-voltage indicators. Neon is placed in enclosed glass tubes of various shapes withan electrode at each end. When neon gas is ionized by the passing of a high-voltage, low-ampselectrical current through it, a bright red color is produced. Other noble gases produce differentcolors, and they can be mixed. Unlike incandescent lamps, neon tubes can be bent andformed into unique shapes, including forming words and images for commercial advertisingand signage.

使用

Neon is primarily used in luminous tubes (vacuum electric discharge tubes), airplane beacons, helium–neon lasers, highvoltage indicators, cryogenic refrigerant, and laboratory experiments. Other noble gases, especially helium and xenon, have been found to be useful in anesthesiology and for neuroprotection, but the few studies using neon have not confirmed its usefulness in clinical medicine.

調製方法

Neon is derived commercially from the atmosphere. It is recovered from air after separation of oxygen and nitrogen in air separation plants. The recovery process is based on liquefaction of air. Neon and helium have boiling points below that of liquid air. Thus, at liquid air temperature, nitrogen, oxygen, argon, krypton, and xenon remain in the liquid form, while a gas stream consisting of neon, helium, and some nitrogen is collected as gaseous mixture. The composition of this mixture can vary with the condenser and rate of withdrawal. Nitrogen is removed further by passing the gaseous mixture at 5 to 6 atm through a condenser maintained at liquid nitrogen temperatures. The residue after this step contains neon as the major component, with significant amounts of helium, hydrogen, and nitrogen.
Such crude neon mixture is purified by various chemical and physical processes. Hydrogen is separated by chemically oxidizing it to water, which is removed by drying. Remaining nitrogen from the crude neon is removed by adsorption over charcoal at the liquid nitrogen temperature. After the removal of nitrogen and hydrogen, the technical grade neon may contain about 75% neon and 25% helium. Such neon-helium mixtures may be further separated into their individual components either by differential absorption on charcoal at cold temperatures or by fractional distillation of their liquefied mixture. Fractional distillation, based on the difference of boiling points between helium (-269°C) and neon (-223°C), is the more expensive process. Neon also may be obtained in liquid form if the charcoal in the adsorption process is maintained at its liquefaction temperature. Process conditions may vary depending on purity of the product desired.

定義

Inert element of atomic number 10, noble gas group of the periodic table, aw 20.179. Three stable isotopes

定義

An inert colorless odorless monatomic element of the rare-gas group. Neon forms no compounds. It occurs in minute quantities (0.0018% by volume) in air and is obtained from liquid air. It is used in neon signs and lights, electrical equipment, and gas lasers. Symbol: Ne; m.p. –248.67°C; b.p. –246.05°C; d. 0.9 kg m–3 (0°C); p.n. 10; r.a.m. 20.18.

定義

neon: Symbol Ne. A colourlessgaseous element belonging to group18 (formerly group 0) of the periodictable (the noble gases); a.n. 10;r.a.m. 20.179; d. 0.9 g dm–3; m.p.–248.67°C; b.p. –246.05°C. Neon occursin air (0.0018% by volume) and isobtained by fractional distillation ofliquid air. It is used in dischargetubes and neon lamps, in which ithas a characteristic red glow. It formshardly any compounds (neonfluorides have been reported). The elementwas discovered in 1898 by SirWilliam Ramsey and M. W. Travers.

一般的な説明

A colorless odorless noncombustible gas. Chemically inert. The vapors are lighter than air. Nontoxic, but can act as a simple asphyxiant. Exposure of the container to prolonged heat or fire may cause NEON to rupture violently and rocket. Principal use is to fill lamp bulbs and tubes.

反応プロフィール

These substances undergo no chemical reactions under any known circumstances. They are nonflammable, noncombustible and nontoxic. They can asphyxiate.

危険性

Simple asphyxiant

危険性

Neon is nontoxic. As an asphyxiate gas, it can smother by removing oxygen from thelungs.

健康ハザード

Vapors may cause dizziness or asphyxiation without warning. Vapors from liquefied gas are initially heavier than air and spread along ground.

火災危険

Non-flammable gases. Containers may explode when heated. Ruptured cylinders may rocket.

安全性プロファイル

An inert asphpant gas.

職業ばく露

Neon is used in photoelectric bulbs and certain light tubes; in the electronic industry; in lasers; in plasma studies; and other research.

輸送方法

UN1065 Neon and UN1913 Neon, refrigerated liquid (cryogenic liquid), Hazard Class: 2.2; Labels: 2.2-Nonflammable compressed gas. Cylinders must be transported in a secure upright position, in a well-ventilated truck. Protect cylinder and labels from physical damage. The owner of the compressed gas cylinder is the only entity allowed by federal law (49CFR) to transport and refill them. It is a violation of transportation regulations to refill compressed gas cylinders without the express written permission of the owner.

純化方法

Pass the gas through a copper coil packed with 60/80 mesh 13X molecular sieves which is cooled in liquid N2, or through a column of Ascarite (NaOH-coated silica adsorbent).

Toxicity evaluation

Neon gas is a simple asphyxiant. It displaces the oxygen necessary to support life. When normal levels of oxygen are not present in the body, then all tissues, organs, and organ systems eventually malfunction. Tissues with particularly high oxygen and energy requirements, including the brain and heart, are particularly susceptible to harmful effects resulting from reduced levels of oxygen in the body.

不和合性

Compressed neon gas under pressure may explode when heated.

廃棄物の処理

Return refillable compressed gas cylinders to supplier. Venting to atmosphere.

ネオン 上流と下流の製品情報

原材料

準備製品


ネオン 生産企業

Global( 25)Suppliers
名前 電話番号 ファックス番号 電子メール 国籍 製品カタログ 優位度
Mainchem Co., Ltd. +86-0592-6210733
+86-0592-6210733 sale@mainchem.com CHINA 32439 55
DWS Specialty Gas Co., Ltd 13194677939 0510-6511610-
0510-6511610 shineliu@dwsgases.com China 346 58
PERIC Special Gases Co., Ltd. 13722349440 0310-7182720-613
guoxiaobin@pericsg.com China 39 58
Zibo Zeno Pharmaceutical Technology Co., Ltd. 0533-8800999 13515338377
0533-7544744 zenuoyiyao@163.com China 55 58
Central China Special Gas (CCSG) Co., Ltd 15674722888 0734-8755555-
0734-8123618 lyq@ccsg.cn China 285 58

7440-01-9(ネオン)キーワード:


  • 7440-01-9
  • NEON
  • liquidneon
  • 10Ne
  • Chebi:33310
  • neon atom
  • neon(0)
  • neon,compressed
  • neon,refrigeratedliquid
  • neongas
  • neonliquid
  • neonliquide
  • NEON, 99.99+%
  • NEON, PRESSURE TIN WITH 600 ML
  • NEON, PRESSURE TIN WITH 1 L
  • Neon, 99.999%
  • Neon, refrigerated liquid (cryogenic liquid).
  • ネオン
  • ネオンガス
  • Neガス
Copyright 2017 © ChemicalBook. All rights reserved