71086-78-7
Helium
CAS: 71086-78-7;7440-59-7
Molecular Formula: He2
71086-78-7 - Names and Identifiers
| Name | Helium |
| Synonyms | Helium helium Einecs 275-187-7 |
| CAS | 71086-78-7 7440-59-7 |
| EINECS | 275-187-7 |
| InChI | InChI=1S/He |
71086-78-7 - Physico-chemical Properties
| Molecular Formula | He2 |
| Density | 0.1785（0℃） |
| Melting Point | -272.3℃ |
| Boling Point | -268.9℃ |
| Physical and Chemical Properties | Characteristics of colorless, tasteless, odorless, inert odor gaseous at room temperature. melting point -272.3 ℃ boiling point -268.9 ℃ relative density 0.1785(0 ℃) |
| Use | Used to fill balloons, thermometers, tubes, wetsuits, atomic reactors and accelerators, smelting, welding, etc |
71086-78-7 - Nature
Open Data Verified Data
colorless, odorless, tasteless, non-toxic, non-flammable inert gas. The gas relative density was 0.21.1 at 101. 3kPa and 138 ℃. Boiling point -268.9 °c. The critical temperature is -267.9 ℃, the critical pressure is 227kPa, and the critical density is 69. 64kg.m-3. No triple point. The latent heat of evaporation was 20.28kJ.kg-l (a 268.9 ℃.101. 3kPa).21.1 ℃, 101. Gas specific heat capacity at 3kPa: cp5.19 kJ/(kg. C),Cy 3.12 kj/(kg. C). It is slightly soluble in water, and its solubility is 0. 97mL.lOOmL_1 at 0 ℃ and 1.08mL.lOOmL-1 at 50 ℃. No chemical interaction with any substance. In case of high fever, the internal pressure of the container increases, and there is a risk of cracking and explosion.
Last Update：2024-01-02 23:10:35
71086-78-7 - Preparation Method
Open Data Verified Data
helium is extracted from natural gas. The natural gas is firstly subjected to catalytic oxygen dehydrogenation, and the high purity helium is prepared by using a refrigeration cycle with an expander and high pressure condensation and adsorption. Or the concentration of 90% of the mixture of neon and helium, the activated carbon adsorption of nitrogen, can be obtained by the concentration of more than 99.9 "of pure helium mixture, through the neon helium separator, get 99.9% of the crude helium product and greater than 98% of the crude neon product. High purity helium with purity of 99. 999% can be obtained by removing hydrogen from crude helium through copper oxide furnace and then absorbing neon at low temperature and high pressure.
Last Update：2022-01-01 08:54:56
71086-78-7 - Use
Open Data Verified Data
In the semiconductor industry, helium is used as a protective gas for the generation of germanium and silicon transistors; It is used in space technology for the replacement of liquid hydrogen injection systems, extrusion source for satellite and rocket and gas source for automatic control engine, helium refrigerator; Used for gas cooling medium, gas thermometer, helium mass spectrometry leak detection, research and development of magnetic resonance scanners and synchrotron and accelerator.
Last Update：2022-01-01 08:54:57
71086-78-7 - Safety
Open Data Verified Data
non-toxic, asphyxiating, in a confined space can be suffocation to death. Inhalation of air containing less than 10% oxygen for a long time can lead to brain tissue damage or death, the initial symptoms include Nausea, Vomit and asthma, exposed to such an atmosphere, people can not help themselves or call for help; inhalation of pure helium leads to immediate loss of consciousness and almost immediate death. When using large amounts of gaseous helium or liquid helium, it should be performed in a well-ventilated place to avoid the formation of oxygen-deficient air. When cold burns and frostbite occur, you should immediately take medical medicine and rinse the affected area with plenty of warm water. Store in a cool, ventilated warehouse. The bin temperature should not exceed 30 ℃. Keep away from fire and heat source. Protection from direct sunlight. Should be stored separately from flammable combustibles.
Last Update：2022-01-01 08:54:57
