Method for producing isotopically enriched helium-4 and use of s

Details Method for producing isotopically enriched helium-4 and use of s Method for producing isotopically enriched helium-4 and use of s

1981-09-28

1985-06-25

Sever, Frank

Refrigeration

Processes

Circulating external gas

62 40, 423262, F25J 302

Patent

active

045251860

ABSTRACT:
Isotopically enriched helium-4, that is, helium-4 which is low in helium-3, is useful as a nuclear reactor coolant. It is produced from liquefied natural gas source helium by distilling helium-3 therefrom. The coolant is preferably enriched in hydrogen up to about 6 percent by volume to thereby improve the heat transfer characteristics of the coolant, and to reduce the power requirements for circulation of the coolant.

REFERENCES:
patent: 4101375 (1978-07-01), Garwin
Mezhov-Deglin; "An Apparatus for Producing Pure He.sup.4 "; Prib i Tekh. Eksper.; No. 3 (1971), pp. 217, [Cryogenics, Aug. 72, pp. 311-312].
Mendelssohn; "Progress in Cryogenics"; Heywood & Co. Ltd.; vol. 1; London; 1959; p. 110.
Keller; "He.sup.3 and He.sup.4 "; Plenum Press; N.Y.; 1969; p. 36.

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