A Procedure for Analysis of Impurities in Grade-A Helium in the Parts-Per-Billion Range

Purer, A.

doi:10.1093/chromsci/3.5.165

Cited by 8 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Gas in these two cylinders was analyzed by means of a recently developed chromatographic procedure that permits analysis in the parts per billion (ppb) range [4]. These analyses showed that the cylinder which had been vacuum baked before filling contained 1.5 ppb of neon and the other 1.8 ppb of neon.…”

Section: Discussionmentioning

confidence: 99%

Simple Technique for the Ultrapurification of Helium

Purer¹,

Stroud²,

Meyer³

1965

Advances in Cryogenic Engineering

Self Cite

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Simple Technique for the Ultrapurification of Helium

Purer¹,

Stroud²,

Meyer³

1965

Advances in Cryogenic Engineering

Self Cite

View full text Add to dashboard Cite

“…in 0. D., and was filled with Linde 13X Molecular Sieve (Purer, 1965). The column was operated initially at -68°C for the best separation of oxygen, nitrogen, and krypton, and then at 50°C for the separation of xenon.…”

Section: Gas Separation Measurementsmentioning

confidence: 99%

Separation of krypton and xenon by selective permeation

Stern

Leone

1980

AIChE Journal

View full text Add to dashboard Cite

The objective of this investigation was to study the separation of krypton and xenon from nuclear reactor atmospheres by selective permeation through silicone rubber capillaries. Effective permeability coefficients for pure krypton xenon, nitrogen, and oxygen were determined between 0 and 40°C and at pressure differences across the capillary walls (Ap) of up to 3.45 x lo5 N/m2 (50 psi). The silicone rubber capillaries had an 0. D. of 635 p m (0.025 in.) and an I. D. of 305 pm (0.012 in.), and were pressurized externally. The effective permeability coefficients decreased with increasing Ap due to the elastic deformation of the capillaries, in general agreement with a deformation analysis of thick-walled elastic tubes.Gas separation studies were made with a Kt--Xe-N2-02 mixture in a permeator containing a bundle of silicone rubber capillaries. The permeator had an effective permeation area of 0.480 m2 (5.165 ft') at a packing density of 4132 m2/rn3 permeator volume (1260 ftYft3), and was operated in a countercurrent mode. The separation studies were conducted at -10 and 20°C and at three Ap values. The separation achieved in the permeator at A p ' s of 1.38 x lo5 N/m2 (20 lb/in.') and 2.07 x lo5 N/m2 (30 lbIin.2) was in good agreement with that predicted from a theoretical model of a permeation stage with countercurrent flow. At 3.45 x lo5 N/m2 (50 lb/in. ' ), the separation approached that predicted from a "perfect mixing" model. This behavior probably was due to local collapses of the capillaries at weak spots in their walls, as was evidenced also by a sharp increase in the axial pressure drop inside the capillaries. SCOPEThe increasing use of nuclear energy to augment the conventional sources of energy has resulted in a strong demand for improved safety in the operation of nuclear reactors. One of the possible dangers in the operation of a nuclear reactor is the accidental release of radioactive 85Kr and '33135Xe to the atmosphere within a reactor containment dome. The radioactive krypton and xenon must then be separated and safely disposed of before the reactor can be further used (Belter, 1963;Blumkin et al., 1966). In 1963, Belter stated that this problem "could be the controlling factor in building large power reactors in populated areas." In the aftermath of the accident at the Three Mile Island nuclear power plant near Harrisburg, Pa., Belter's statement shows remarkable foresight.Several techniques of separating radioactive krypton and xenon from mixtures with air and other gases have been studied in recent years. These studies were aimed at the development of a separation plant that is sufficiently compact to be easily transported to the scene of an accident. The removal of radioactive krypton and xenon is also of interest for the decontamination of the off-gas from plants that process spent reactor fuels and of the cover gas of a liquid-metal-cooled fast breeder reactor.

show abstract

Anwendung der Gaschromatographie zur Trennung und Bestimmung anorganischer Stoffe

Rüssel

Tölg

Inorganic Gas Chromatography

View full text Add to dashboard Cite

A Procedure for Analysis of Impurities in Grade-A Helium in the Parts-Per-Billion Range

Cited by 8 publications

References 0 publications

Simple Technique for the Ultrapurification of Helium

Simple Technique for the Ultrapurification of Helium

Separation of krypton and xenon by selective permeation

Anwendung der Gaschromatographie zur Trennung und Bestimmung anorganischer Stoffe

Contact Info

Product

Resources

About