Krypton, refrigerated liquid (cryogenic liquid) [UN1970] [Nonflammable gas]
krypton
CAS: 7439-90-9
Molecular Formula: Kr
Krypton, refrigerated liquid (cryogenic liquid) [UN1970] [Nonflammable gas] - Names and Identifiers
Krypton, refrigerated liquid (cryogenic liquid) [UN1970] [Nonflammable gas] - Physico-chemical Properties
| Molecular Formula | Kr |
| Molar Mass | 83.8 |
| Density | 908 kg/m3; d0 (101.3 kPa) 3.7493 kg/m3; d (normal bp) 8.6 kg/m3; d (normal bp) 2415 kg/m3; d (triple pt) 2451 kg/m3; d (triple pt) 2826 kg/m3 |
| Melting Point | -157℃ |
| Boling Point | bp -153.35° |
| Water Solubility | 59.4mL/1000g H2O (20°C) [KIR78]; Henry’s law constants, k×10?4: 3.685 (70.2°C), 4.017 (175.0°C), 3.761 (175.0°C), 2.392 (252.5°C) [POT78] |
| Vapor Presure | 154000mmHg at 25°C |
| Appearance | colorless gas |
| Merck | 13,5340 |
| Stability | Stable and unreactive; not combustible. |
| Physical and Chemical Properties | Colorless gas. |
| Use | Can be used to fill the ionization chamber to measure cosmic radiation, and can be used as a shielding material for X-Ray work |
Krypton, refrigerated liquid (cryogenic liquid) [UN1970] [Nonflammable gas] - Risk and Safety
| Safety Description | S9 - Keep container in a well-ventilated place. S38 - In case of insufficient ventilation, wear suitable respiratory equipment. |
| UN IDs | UN 1950 2.2 |
| WGK Germany | 3 |
| FLUKA BRAND F CODES | 4.5-31 |
| Hazard Class | 2.2 |
Krypton, refrigerated liquid (cryogenic liquid) [UN1970] [Nonflammable gas] - Nature
Open Data Verified Data
a colorless gas, which does not burn and does not support combustion. Can absorb X-rays. The relative density of gas is 3. 736(-152.9 ℃), and the relative density of liquid is 2.155. Melting Point -156.6 °c, boiling point (- 152.3 1.0) °c. The critical temperature was -63. 81 ℃ and the critical pressure was 55 × lO5 Pa. With high density, low thermal conductivity, high transmittance and other properties. Krypton is chemically inert under all normal conditions. It does not combine with other elements or compounds. However, KrF2 can be generated when a mixture of Krypton and fluorine is subjected to an electric discharge at 84K or irradiated with an electron beam at 123K. KrF2 was very unstable. It decomposes rapidly at 0 °c. KrF 4 has been prepared and is generated by the action of discharge at low temperature.
Last Update：2024-01-02 23:10:35
Krypton, refrigerated liquid (cryogenic liquid) [UN1970] [Nonflammable gas] - Preparation Method
Open Data Verified Data
- Air separation method: a mixture of krypton and xenon was extracted from an air separation unit. After extraction of lean Krypton, removal of hydrocarbons and carbon dioxide, and separation, 99. 99% pure Krypton was obtained.
- extracting Krypton synthetic ammonia tail gas from synthetic ammonia tail gas to extract argon process flow by-product Krypton and hydrazine mixed gas, and then after rectification, washing, oxygen removal, adsorption and desorption, 99% krypton gas can be obtained.
- the extraction of Krypton from nuclear reactor fission gas utilizes Kr85 of radioactivity in the pyrolysis exhaust gas of a nuclear reactor. Commercially available are the Freon solvent absorption method.
Last Update：2022-01-01 11:06:38
Krypton, refrigerated liquid (cryogenic liquid) [UN1970] [Nonflammable gas] - Use
Open Data Verified Data
widely used in the electronics industry, electric light source industry, but also in gas lasers and plasma flow. Compared with the same-power argon bulb, the bulb filled with pure argon gas has the advantages of high luminous rate, small volume, long service life, power saving and the like. A large number of mine lamps are used for manufacturing, and because of its particularly high transmittance, it can be used for manufacturing the illumination lamp and the runway indicator light of the night battle vehicle. Health care used to measure cerebral blood flow. Its isotope can be used as a developing agent. Radioactive krypton can be used for leak detection and continuous measurement of material thickness in sealed containers, and can also be made into atomic lamps without electric energy. In addition, Kr86 is used for the international reference calibration of the length, and Kr8s is used for the krypton-treatment of the material.
Last Update：2022-01-01 11:06:38
Krypton, refrigerated liquid (cryogenic liquid) [UN1970] [Nonflammable gas] - Safety
Open Data Verified Data
is a non-combustible gas, risk code: GB2.2 class 22013. UN N0.1970; IMDG Code page 2153, Class 2.2. (Compressed) GB2.2 class 22014. UN n0.2153; IMDG Code page 2.2, class 1. (Liquefied). Krypton itself is non-toxic, but has a asphyxiating effect at high concentrations. Inhalation of a mixture of 50% Kr and 20% 02, can fall into a complete Coma state. Notable for argon symptom of asphyxia. Packed with 2L ampoules, protected with wooden cases or cartons. Store in a cool, dry warehouse. It can be transported as an ordinary cargo packed in a bottle with a capacity of not more than 2L. During the process of storage, transportation, loading and unloading, the packaging should be handled with care to avoid breakage. In case of fire, it can be suppressed by water and various fire-retardants.
Last Update：2022-01-01 11:06:39
Krypton, refrigerated liquid (cryogenic liquid) [UN1970] [Nonflammable gas] - Reference Information
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Overview | a chemical element of the zeroth periodic system of the genus. Discovered by W. Ramsay and others in the United Kingdom in 1898. The content of Krypton in the atmosphere was 1.14 × 10 − 4% by volume. It is colorless. Tasteless. Odorless, belonging to one of six kinds of inert gases, chemically inactive. |
| preparation method | 1. The process of extracting Krypton synthesis ammonia tail gas and extracting argon from synthesis ammonia tail gas is a byproduct of krypton and xenon mixture gas, after distillation, washing, oxygen removal, adsorption, desorption can be obtained 99% Krypton. 2, air separation method, extraction of krypton, xenon mixture from air separation unit. After extraction of lean Krypton, removal of hydrocarbons and carbon dioxide, separation, made of 99.99% pure Krypton. 3. The Kr85 of radioactivity in the pyrolysis waste gas of the nuclear reactor is comprehensively utilized by extracting Krypton from the nuclear reactor fission gas. 4, the industrial implementation of a Freon solvent absorption method. 5, industrial use of fractionated liquid air system. |
| Application | is widely used in the electronics industry, electric light source industry, and also used in gas lasers and plasma flow. Compared with the same-power argon bulb, the bulb filled with pure hydrogen gas has the advantages of high luminous rate, small volume, long service life, power saving and the like. A large number of mine lamps are used for manufacturing, and because of its particularly high transmittance, it can be used for manufacturing the illumination lamp and the runway indicator light of the night battle vehicle. Health care used to measure cerebral blood flow. Its isotope can be used as a developing agent. Radioactive krypton can be used for leak detection and continuous measurement of material thickness in sealed containers, and can also be made into atomic lamps without electric energy. In addition, Kr86 is used for international reference calibration of length, and Kr<85> is used for "Krypton" processing of materials. |
| DOT Classification | 2.2 (Nonflammable gas) |
Last Update：2024-04-09 21:04:16
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