US4076607A
Expired / Lapsed
US
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Process for coal desulfurization
Assignee: Individual
•
Filing: 1975-12-22
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Granted: 1978-02-28
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Expires: 1995-12-22
Abstract
Abstract A process for coal desulfurization generates extremely low amounts of heat from microwave energy to induce thermochenical, in-situ, reactions to liberate sulfur in the form of stable gaseous species, such as H2S, COS and SO2.
Inventors
- 👤 Peter D. Zavitsanos
- 👤 Kenneth W. Bleiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:26
CPC Classifications
C; C10; C10L; C10L9/00; C10B; C10B19/00; C10L9/08; Y; Y10; Y10S; Y10S44/00; Y10S44/904
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
86 words
A process for desulfurization of carbonaceous aggregates containing a relatively high percentage of sulfur, which comprises: (a) crushing said aggregates to an average particle diameter of a size of about less than 5 centimeters; (b) irradiating said aggregates with electromagnetic microwave energy for a duration to obtain an average temperature of said aggregates of no more than 150° C to induce chemical reactions to break bonds uniting gaseous elements and sulfur contained in said aggregates; (c) liberating said sulfur from said aggregate upon forming gaseous compounds.
Claim 2
Dependent Claim
86 words
A process for desulfurization of carbonaceous aggregates containing a relatively high percentage of sulfur, which comprises: (a) crushing said aggregates to an average particle diameter of a size of about less than 5 centimeters; (b) irradiating said aggregates with electromagnetic microwave energy for a duration to obtain an average temperature of said aggregates of no more than 150° C to induce chemical reactions to break bonds uniting gaseous elements and sulfur contained in said aggregates; (c) liberating said sulfur from said aggregate upon forming gaseous compounds.
Claim 3
Dependent Claim
40 words
A process for desulfurization of carbonaceous aggregates as recited in claim 1, further comprising: (a) selectively tuning input frequency of said electromagnetic energy to an optimum coupling frequency associated with sulfur containing compounds in a particular one of said aggregates.
Claim 4
Dependent Claim
17 words
A process for desulfurization of carbonaceous aggregates as recited in claim 1 wherein said aggregate is coal.
Claim 5
Dependent Claim
24 words
A proces for desulfurization of carbonaceous aggregates as recited in claim 3 wherein said gaseous compounds are hydrogen sulfide, sulfur dioxide and carbon oxysulfide.
Claim 6
Dependent Claim
57 words
A process for desulfurization of carbonaceous aggregates as recited in calim 4 further comprising: (a) generating thermal energy from said microwave energy to desulfurize coal at a rate of about 0.3 - 1% of a heating value of said coal, wherein said generated energy liberates said sulfur with little loss of said heating value of said coal.
Claim 7
Dependent Claim
57 words
A process for desulfurization of carbonaceous aggregates as recited in calim 4 further comprising: (a) generating thermal energy from said microwave energy to desulfurize coal at a rate of about 0.3 - 1% of a heating value of said coal, wherein said generated energy liberates said sulfur with little loss of said heating value of said coal.
Claim 8
Dependent Claim
22 words
A process for desulfurization of carbonaceous aggregates as recited in claim 5 wherein said heating energy is about 3 calories per gram.
Claim 9
Dependent Claim
31 words
A process for desulfurization of carbonaceous aggregates as recited in claim 6 wherein said electromagnetic energy is about 1000 watts at a frequency of about 2.45 - 10 GHZ per second.
Claim 10
Dependent Claim
51 words
A process for desulfurization of carbonaceous aggregates as recited in claim 4 further comprising: (a) transporting said coal to a reaction chamber in a bed of about one to several centimeters in thickness; (b) separating said hydrogen sulfur, sulfur dioxide and carbon oxysulfide for subsequent trapping and converting to elemental sulfur.
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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) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |