US3963457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coal gasification process
Assignee: Beazer East Inc
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Filing: 1974-11-08
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Granted: 1976-06-15
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Expires: 1994-11-08
Abstract
Abstract An improvement in the Koppers-Totzek coal gasification system comprises the step of adding cool and clean recycle gas to the product gas as it leaves the gasifier unit, thereby eliminating the use of water sprays to quench the product gas.
Inventors
- 👤 Martin Hess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:31
CPC Classifications
C; C10; C10J; C10J3/00; C10J3/46; C10J3/466; C10J3/02; C10J3/06; C10J3/16; C10J3/48; C10J3/485; C10J3/72; C10J3/82; C10J3/84; C10J3/845; C10J3/86; C10J2300/00; C10J2300/09; C10J2300/0913; C10J2300/093; C10J2300/0953; C10J2300/0959; C10J2300/0973; C10J2300/0976; C10J2300/18; C10J2300/1807; C10J2300/1823; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y02P20/129
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
58 words
A coal gasification process known as the Koppers-Totzek process wherein pulverized coal, oxygen and steam are introduced through opposed burner heads into a gasifier and react therein to produce slag and a product gas that is thereafter scrubbed, wherein the improvement comprises: a. recycling scrubbed product gas to mix with and cool said product gas prior to scrubbing.
Claim 2
Dependent Claim
58 words
A coal gasification process known as the Koppers-Totzek process wherein pulverized coal, oxygen and steam are introduced through opposed burner heads into a gasifier and react therein to produce slag and a product gas that is thereafter scrubbed, wherein the improvement comprises: a. recycling scrubbed product gas to mix with and cool said product gas prior to scrubbing.
Claim 3
Dependent Claim
25 words
The invention of claim 1 including the step: a. removing a portion of cooled and scrubbed product gas from said process as said recycle gas.
Claim 4
Dependent Claim
69 words
A coal gasification process known as the Koppers-Totzek process wherein pulverized coal, oxygen and steam react in a gasifier to produce slag and a product gas that is subjected to water spraying, wherein the improvement comprises: a. eliminating said water spraying of said product gas; and b. cooling said product gas with cleaned and cooled product gas recycled into and mixed with the product gas generated in said gasifier.
Claim 5
Dependent Claim
69 words
A coal gasification process known as the Koppers-Totzek process wherein pulverized coal, oxygen and steam react in a gasifier to produce slag and a product gas that is subjected to water spraying, wherein the improvement comprises: a. eliminating said water spraying of said product gas; and b. cooling said product gas with cleaned and cooled product gas recycled into and mixed with the product gas generated in said gasifier.
Claim 6
Dependent Claim
25 words
The invention of claim 3 wherein: a. said cleaned and cooled product gas is product gas that has been treated in a gas scrubbing device.
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) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |