US4533365A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the separation and recycling of NOx gas constituents through adsorption and desorption on a molecular sieve
Assignee: Forschungszentrum Jülich
•
Filing: 1983-07-08
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Granted: 1985-08-06
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Expires: 2003-07-08
Abstract
Abstract For the separation and recycling of NO x gas constituents through adstion and desorption on a molecular sieve the molecular sieve is passed through in sequential, alternating process steps. Initially, the NO x is retained up to saturation of the molecular sieve. Thereafter the molecular sieve is regenerated through the introduction of gas. In order to reduce the demands during scavenging of the molecular sieve, and then to facilitate the provision of a closed separating and recycling system, the molecular sieve for regeneration is heated to a temperature for desorbing the adsorbed NO x and scavenged with a portion of the waste gas containing the NO x which is to be cleaned. The scavenging gas flow is recycled after passing through the molecular sieve.
Inventors
- 👤 Helmut Ringel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:27
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/20; C01B21/38; C01B21/40; B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D2253/00; B01D2253/10; B01D2253/106; B01D2253/108; B01D2253/1085; B01D2253/30; B01D2253/302; B01D2253/308; B01D2257/00; B01D2257/40; B01D2257/404; B01D2259/00; B01D2259/40; B01D2259/40083; B01D2259/40086; B01D2259/402
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
118 words
In a process for the separation and recycling of NO x gas constituents through adsorption and desorption on a molecular sieve wherein, in alternating process steps, NO x -containing waste gas initially flows through the molecular sieve until saturation of the molecular sieve with NO x , and thereafter the NO x is desorbed through the introduction of gas; the improvement comprising: heating the molecular sieve for regeneration to a temperature for desorbing the adsorbed NO x ; scavenging the molecular sieve with a portion of the NO x -containing waste gas to produce a scavenging gas; and recycling the scavenging gas flow after passing through the molecular sieve wherein said waste gas comprises an untreated feed gas.
Claim 2
Dependent Claim
118 words
In a process for the separation and recycling of NO x gas constituents through adsorption and desorption on a molecular sieve wherein, in alternating process steps, NO x -containing waste gas initially flows through the molecular sieve until saturation of the molecular sieve with NO x , and thereafter the NO x is desorbed through the introduction of gas; the improvement comprising: heating the molecular sieve for regeneration to a temperature for desorbing the adsorbed NO x ; scavenging the molecular sieve with a portion of the NO x -containing waste gas to produce a scavenging gas; and recycling the scavenging gas flow after passing through the molecular sieve wherein said waste gas comprises an untreated feed gas.
Claim 3
Dependent Claim
47 words
A process as claimed in claim 1, wherein said molecular sieve is constituted of synthetic mordenite having hydrogen as cation and having an SiO 2 to Al 2 O 3 ratio of 10:1; and wherein the molecular sieve has a pore width of 8 to 9 Å.
Claim 4
Dependent Claim
33 words
A process as claimed in claim 2, comprising adsorbing the NO x gas constituents on the molecular sieve at room temperature, and desorbing the constituents at a temperature of at least 150° C.
Claim 5
Dependent Claim
38 words
A process as claimed in claim 1, comprising heating the molecular sieve for regeneration at a terminated waste gas flow; and scavenging said molecular sieve after reaching the desorption temperature with a small portion of the waste gas.
References Cited (Backward Citations)
US1610288A
Cited
US2629460A
Cited
US2963519A
Cited
US3015369A
Cited
US3205638A
Cited
US3238701A
Cited
US3306841A
Cited
US3689212A
Cited
US3542525A
Cited
US3674429A
Cited
US3808327A
Cited
JPS5133877A
Cited
US4153429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |