Properties and preparation of neon

2022-04-24 0 By

What is neon?Neon, the second lightest inert gas, is orange-red in neon lamps and vacuum discharge tubes.In many applications, it is a cheaper refrigerant than helium.On a unit volume basis, it has 40 times the refrigeration capacity of liquid helium and three times that of liquid hydrogen.It is a rare gas with only one neon atom in its molecule.It is a chemically inert gas and non-toxic.Since it is non-reactive and does not form compounds, it is not harmful to the environment and has no effect.This substance has no negative effect on the environment.It can make strange compounds with fluorine.Fluorine is an inert element that can be used in the laboratory to make different compounds.It also produces an unstable hydrate.Chemical Properties of Neon Neon is an inert gas, and it belongs to period 2 and group 0 in the periodic table.It’s a P-block element with an atomic number of 10 and a relative atomic mass of 20.It remains in the gaseous state at 20°C.Its weight is 0.0025 g/cm3, and its density is 0.0025 g/cm3.Neon has a melting point of -248.59°C and a boiling point of -246.046°C.2s2, 2P6 is the electron configuration for neon.It is chemically inert and non-toxic.Since neon is an inert gas, it does not react and does not easily form compounds.Neon therefore does not pose a significant threat to the environment.However, neon has a wide range of applications.Neon produces unstable hydrates in most cases.It can also represent complex compounds containing halogens, such as fluorine, which is an inert element.Neon has ten electrons, protons and neutrons for every electron, proton and neutron.It’s made up of two shells.Some properties are given below: solid structure: face-centered cubic heat of melting: 0.3317 kJ/mol Specific heat capacity: 0.904 J/gK Heat of vaporization: 1.7326 kJ/mol Atomic radius: 38 PM Thermal conductivity: 0.05 W/mK Atomic volume: 16.7 cm3/mol.It is prepared by fractionation of liquid air.Since air is the only source, it’s much more expensive than helium.Neon, whether liquid or gaseous, is relatively expensive; liquid neon can cost more than 55 times as much as liquid helium.Driving up neon prices is its rarity, which, unlike helium, can only be obtained from air.Air is the sole source of neon.In the process of low temperature distillation separation, most of the volatile components enter the first separation part.It is collected from under the hood of the air fractionation unit.This primordial gas produces only 3-10% of the neon-helium mixture; the rest is nitrogen.This is natural, since the volume concentration of neon in 1000 liters of air is 18.2 sm3, and the volume concentration of helium is 5 sm3.The mixture is then sent to the expectorator, a distillation tube in which most of the nitrogen is concentrated.As a result, the concentration of the neon-helium binary mixture increases to 35-40%.Another device called a sputum extractor sorbent almost completes the nitrogen separation process.Depending on the degree of purification, the final mixture contains 30-75% neon and 10-25% helium.Initial neon purification The early methods used to separate pure neon depended on fractations of liquefied mixtures of neon, argon, krypton and xenon.The original method used by Ramsay and Travers has been outlined above.Another method used by the researchers is to put the gas escaping from the Hampson liquefier (consisting mainly of nitrogen and all the volatile components in the air) back into the inlet of the compression pump.In this way, it is partially liquefied again, further reducing the less volatile components, resulting in a gas with a relatively high content of helium and neon.The concentration of this lighter gas can also be produced by the liquefaction of the whole gas escaping from the air liquefier and by blowing a stream of air through the liquid;The part that evaporates the first time contains most of the helium and neon.The enriched gas is then released from the oxygen and nitrogen using the usual chemical methods, and the residue is liquefied and fractionated to remove the argon.Finally, the neon gas separated from the helium by cooling the mixture to the temperature of liquid hydrogen and pumping the gaseous helium from the solid neon gas.A simpler way to separate neon from a mixture of inert gases obtained in the air was to use a cooling charcoal invented by Dewar.It was found that when the mixture came into contact with charcoal cooled to about -100 °C, argon, krypton, and xenon were completely absorbed, while most of the helium and neon were pumped away as gases.Neon can then be separated from helium by contacting a charcoal fire that is cooled to the temperature of liquid air (-180 ° C to -190 ° C);Most of the neon atoms are absorbed, while all helium atoms with a small amount of neon can be removed.When the charcoal is heated to its normal temperature, the neon changes into a fairly pure state.From the gases retained in the first charcoal, Crowder’s apparatus could obtain krypton and xenon.The most convenient way to get neon from the air is Claude’s modified partial condensate and distiller liquid air, where most of the oxygen and nitrogen are compressed and the liquid falls back to the bottom of the reservoir.The upper part of the unit consists of a distillation tower similar in structure to a Coffey distiller.