Compressed Neon

Synonyms Neon, compressed Neon gas Neon, refrigerated liquid... 

Neon, compressed Neon gas. See Neon Neonite EG60/6mm, EG61/12mm, Neonite XB 3951. See Epoxy resin Neononane CAS 3522-94-9 UN 1920... 

Question by P. G, Meyers, Pratt Whitney Aircraft How high in pressure have you handled or compressed neon ... 

For distributing larger quantities of gaseous helium, argon, and occasionally neon, a number of large, horizontal, compressed gas cylinders are manifolded on tmck semitrailers (called tube trailers) or railroad cars. Like individual cylinders, these serve both as transport containers and rental storage containers. Capacities of tube trailers range from about 300 to 5,000 m (10,000—175,000 fT) of gas. 

Values extracted and in some cases rounded off from ttose cited in RaLinovict (ed.), Theimophysical Propeities of Neon, Ai gon, Kiypton and Xenon, Standards Press, Moscow, 1976. Ttis source contains values for tte compressed state for pressures up to 1000 bar, etc. t = triple point. Above tbe sobd line tbe condensed phase is solid below it, it is liquid. Tbe notation 5.646. signifies 5.646 X 10 . At 83.8 K, tbe viscosity of tbe saturated liquid is 2.93 X 10 Pa-s = 0.000293 Ns/ui . Tbis book was published in English translation by Hemisphere, New York, 1988 (604 pp.). 

Every gas consists of particles, whether as atoms (such as neon) or as molecules (such as methane). To a relatively good first approximation, any atom can be regarded as a small, incompressible sphere. The reason why we can compress a gas relates to the large separation between the gas particles. The first effect of compressing a gas is to decrease these interparticle distances. 

A plasma is an appreciably ionized gas(about 1% or more) having no net charge, and may have a wide range of densities. Plasmas are of particular interest because of the possibility of initiating nuclear fusion in them, but they also appear in such phenomena as a neon sign, a lightning stroke, the ionosphere about the earth, shock waves, and the compressed layer of hot gas about an object entering the earth s atmosphere They appear in flames and detonation waves. It seems well established that free radicals and ions are present at well over equilibrium concentrations in flames (Ref 1). The ions appear to be produced not by thermal processes but by chemical factors which cause abnormal electronic excitation... 

Plasmas are of particular interest now because of the possibility of initiating nuclear fusion in them but they also appear in phenomena ranging from those found in a neon sign, a lightning stroke, the ionosphere about the earth, shock waves, and the compressed layer of hot gas around an astronaut s capsule as he comes back thru the earth s atmosphere ... 

At atmospheric pressure, H2 condenses at -423°F (-253°C). As the pressure rises, the condensation temperature also increases. The liquefaction process utilizes a number of heat pumps in series to reduce the H2 temperature from ambient to the liquefaction temperature. The efficiency of this compression-condensation process ranges from 35 to 60% as a function of size and the refrigerant used in the heat pumps. One of the most efficient refrigerants is a mixture of helium and neon (Quack cycle). The energy consumption of liquefiers theoretically ranges from 5 to 15 kWh/kg... 

If, in the heat pumps, the energy of compression is not recovered but is wasted in letdown valves (as the pressure of the working fluid is reduced to the low pressure of the evaporator (Joule-Thomson cycle), the liquefaction efficiency will be low (35-60%). This range of efficiencies is a function of the liquefier size and refrigerant used. If the letdown valves are replaced by turbo expanders (Brayton cycle), which recover some of the compression energy during pressure letdown, and if helium or neon refrigerants are used, the efficiency can theoretically reach 80-90%. 

The effect of pressure on hydrogen is represented graphically in fig. 1 (p. 18), the product pv being plotted3 against the pressure p. Neon and helium resemble hydrogen in being less compressible than Boyle s law demands.4... 

SYNS NEON, compressed (UN 1065) (DOT) NEON, refrigerated Uquid (cryogenic Uquid) (UN 1913) (DOT ... 

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