Patent US3218978A successfully refreshed from Google Patents.
Patent US3854914A successfully refreshed from Google Patents.
US3854914A
Expired / Lapsed
US
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Recovery of neon and helium from air by adsorption and closed cycle neon refrigeration
Assignee: PHYSICHESKI INST ANEB PRI BAN BG
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Filing: 1972-01-27
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Granted: 1974-12-17
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Expires: 1992-01-27
Abstract
Abstract A method of and an apparatus for the recovery simultaneously of substantial pure neon and helium from air wherein a neon cycle provides the cooling for condensation of the components to be removed. Condensation of neon is followed by an absorption step for recovery of residual neon.
Inventors
- 👤 E Leyarovski
- 👤 B Nicolov
- 👤 Y Gueorguiev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:27
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/0228; F25J3/028; F25J3/029; F25J3/04; F25J3/04642; F25J3/08; F25J2200/00; F25J2200/80; F25J2205/00; F25J2205/02; F25J2205/04; F25J2205/20; F25J2205/24; F25J2205/40; F25J2205/60; F25J2210/00; F25J2210/40; F25J2210/42; F25J2215/00; F25J2215/30; F25J2215/32; F25J2270/00; F25J2270/02; F25J2270/12; F25J2270/14; F25J2270/60; F25J2270/90; F25J2270/904; Y; Y10; Y10S; Y10S62/00; Y10S62/923
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
154 words
A METHOD OF OBTAINING NEON AND HELIUM FROM THE AIR, COMPRISING THE STEPS OF A, EPARATING NITROGEN AND OXYGEN FROM THE AIR AND PRODUCING A NEON AND HELIUM GAS MIXTURE; B. COOLING SAID NEON AND HELIUM GAS MIXTURE BY HEAT EXCHANGE WITH A CIRCULATING NEON COOLANT IN A CLOSED AUXILARY COOLING CYCLE, THEREBY CONDENSING NEON WITH ABSORBED HYDROGEN FROM SAID MIXTURE WHILE PRODUCE A HELIUM-RICH GAS CONTAINING NEON AND HYDROGEN; C. PASSING SAID HELIUM-RICH GAS THROUGH AN ADSORBENT WHILE ING NEON AND HYDROGEN AND RECOVERING SUBSTANTIALLY PURE HELIUM CONTINOUSLY THEREFROM; D. DESORBING NEON AND HYDROGEN FROM SAID ADSORBENT WHILE USING THE LATENT HEAT OF DESORPTION TO PARTLY COOL SAID GAS MIXTURE; E. THROTTLING THE CONDENSED NEON WITH ABSORBED HYDROGEN TO ATMOSPHERIC PRESSURE THEREBY FORMING HYDROGEN VAPOR AND DISCHARGING THE SAME; AND F. REMOVING HYDROGEN FROM THE NEON AND HELIUM SUBSEQUENT TO STEP (A) BUT PRIOR TO THE RECOVERY OF PURE HELIUM IN STEP (C).
Claim 2
Independent Claim
154 words
A METHOD OF OBTAINING NEON AND HELIUM FROM THE AIR, COMPRISING THE STEPS OF A, EPARATING NITROGEN AND OXYGEN FROM THE AIR AND PRODUCING A NEON AND HELIUM GAS MIXTURE; B. COOLING SAID NEON AND HELIUM GAS MIXTURE BY HEAT EXCHANGE WITH A CIRCULATING NEON COOLANT IN A CLOSED AUXILARY COOLING CYCLE, THEREBY CONDENSING NEON WITH ABSORBED HYDROGEN FROM SAID MIXTURE WHILE PRODUCE A HELIUM-RICH GAS CONTAINING NEON AND HYDROGEN; C. PASSING SAID HELIUM-RICH GAS THROUGH AN ADSORBENT WHILE ING NEON AND HYDROGEN AND RECOVERING SUBSTANTIALLY PURE HELIUM CONTINOUSLY THEREFROM; D. DESORBING NEON AND HYDROGEN FROM SAID ADSORBENT WHILE USING THE LATENT HEAT OF DESORPTION TO PARTLY COOL SAID GAS MIXTURE; E. THROTTLING THE CONDENSED NEON WITH ABSORBED HYDROGEN TO ATMOSPHERIC PRESSURE THEREBY FORMING HYDROGEN VAPOR AND DISCHARGING THE SAME; AND F. REMOVING HYDROGEN FROM THE NEON AND HELIUM SUBSEQUENT TO STEP (A) BUT PRIOR TO THE RECOVERY OF PURE HELIUM IN STEP (C).
Claim 3
Dependent Claim
41 words
The method defined in claim 1 wherein neon is desorbed from said adsorbent by subjecting the adsorbent to evacuation at a temperature lower than the normal boiling point of neon thereby recovering the cooling capacity of the latent heat of desorption.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |