US4368057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for reducing ammonia concentration in pre-combusted fuel gas using nitric oxide
Assignee: Individual
•
Filing: 1980-10-14
•
Granted: 1983-01-11
•
Expires: 2000-10-14
Abstract
Abstract Processes for converting NH 3 contaminants of gaseous fuel to N 2 . The processes involve reacting gaseous fuel containing NH 3 with a sufficient amount of NO at a temperature and for a time sufficient to convert a portion of the NH 3 to N 2 . The processes disclosed are especially useful in converting NH 3 contaminants in coal gas to N 2 .
Inventors
- 👤 Ronald D. Matthews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:11
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/50; C10; C10K; C10K3/00; Y; Y02; Y02E; Y02E20/00; Y02E20/16; Y02E20/18
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
71 words
A process prior to combustion for selectively converting NH 3 to N 2 in a nitrogenous contaminated gaseous fuel, said process comprising the steps of: providing a volume of pre-combusted gaseous fuel containing NH 3 ; contacting said volume of gaseous fuel with NO; and reacting said gaseous fuel and NO at a temperature and for a time sufficient to convert a portion of the NH 3 to N 2 .
Claim 2
Dependent Claim
71 words
A process prior to combustion for selectively converting NH 3 to N 2 in a nitrogenous contaminated gaseous fuel, said process comprising the steps of: providing a volume of pre-combusted gaseous fuel containing NH 3 ; contacting said volume of gaseous fuel with NO; and reacting said gaseous fuel and NO at a temperature and for a time sufficient to convert a portion of the NH 3 to N 2 .
Claim 3
Dependent Claim
16 words
The process according to claim 1 wherein the gaseous fuel is a product of coal gasification.
Claim 4
Dependent Claim
35 words
The process according to claim 1 wherein the amount of NO contacting said volume of gaseous fuel ranges from about 0.001 to about 2.5 times the amount of NH 3 present in the gaseous fuel.
Claim 5
Dependent Claim
29 words
The process according to claim 1 wherein the amount of NO contacting said volume of gaseous fuel is stoichometric with the amount of NH 3 in the gaseous fuel.
Claim 6
Dependent Claim
19 words
The process according to claim 1 wherein the reaction temperature ranges from about 700° K. to about 1900° K.
Claim 7
Dependent Claim
17 words
The process according to claim 1 wherein the reaction is carried out in an oxygen deficient environment.
Claim 8
Dependent Claim
20 words
The process according to claim 1 wherein the reaction is carried out in the absence of exogenous O 2 .
Claim 9
Dependent Claim
35 words
The process according to claim 1 wherein the reaction is carried out at a temperature and for a time sufficient to convert a portion of the NH 3 to N 2 to a predetermined endpoint.
Claim 10
Dependent Claim
30 words
The process according to claim 8 wherein the predetermined endpoint is such that the residual nitrogenous components, excluding N 2 , comprise less than 400 ppm of the gaseous fuel.
Claim 11
Dependent Claim
70 words
A process prior to combustion for selectively converting NH 3 to N 2 in a nitrogenous contaminated gaseous fuel, said process comprising the steps of: providing a stream of pre-combusted gaseous fuel containing NH 3 ; contacting said gaseous fuel stream with NO; and reacting said gaseous fuel stream and NO at a temperature and for a time sufficient to convert a portion of NH 3 to N 2 .
Claim 12
Dependent Claim
70 words
A process prior to combustion for selectively converting NH 3 to N 2 in a nitrogenous contaminated gaseous fuel, said process comprising the steps of: providing a stream of pre-combusted gaseous fuel containing NH 3 ; contacting said gaseous fuel stream with NO; and reacting said gaseous fuel stream and NO at a temperature and for a time sufficient to convert a portion of NH 3 to N 2 .
Claim 13
Dependent Claim
16 words
The process according to claim 10 wherein the gaseous fuel is a product of coal gasification.
Claim 14
Dependent Claim
20 words
The process according to claim 10 wherein the gaseous fuel is provided as an emitted stream from a gasifier exit.
Claim 15
Dependent Claim
39 words
The process according to claim 12 wherein the NO contacts the stream of gaseous fuel within a short distance of the gasifier exit, wherein the temperature of the gaseous stream is within about 300° K. of the exit temperature.
Claim 16
Dependent Claim
25 words
The process according to claim 12 wherein the temperature of the reaction is maintained by the heat generated by subsequent combustion of the gaseous fuel.
Claim 17
Dependent Claim
19 words
The process according to claim 10 wherein the reaction temperature ranges from about 700° K. to about 1900° K.
Claim 18
Dependent Claim
17 words
The process according to claim 10 wherein the reaction is carried out in an oxygen deficient environment.
Claim 19
Dependent Claim
20 words
The process according to claim 10 wherein the reaction is carried out in the absence of exogenous O 2 .
Claim 20
Dependent Claim
36 words
The process according to claim 10 wherein the amount of NO contacting said stream of gaseous fuel ranges from about 0.001 to about 2.5 times the amount of NH 3 present in the gaseous fuel stream.
Claim 21
Dependent Claim
30 words
The process according to claim 10 wherein the amount of NO contacting said stream of gaseous fuel is stoichiometric with the amount of NH 3 in the gaseous fuel stream.
Claim 22
Dependent Claim
35 words
The process according to claim 10 wherein the reaction is carried out at a temperature and for a time sufficient to convert a portion of the NH 3 to N 2 to a predetermined endpoint.
Claim 23
Dependent Claim
30 words
The process according to claim 20 wherein the predetermined endpoint is such that the residual nitrogenous components, excluding N 2 , comprise less than 400 ppm of the gaseous fuel.
References Cited (Backward Citations)
US3900554A
Cited
DE2852143A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |