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US3971705A
Expired / Lapsed
US
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Method of producing char from pulp manufacturing waste liquor
Assignee: Sanyo Kokusaku Pulp Co Ltd
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Filing: 1974-04-17
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Granted: 1976-07-27
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Expires: 1994-04-17
Abstract
Abstract Char from the waste liquor of a pulp manufacturing process is produced by confining the waste liquor in a container and feeding the container into an air heating furnace in a manner such that the container is contacted countercurrently with heated air without rotating or stirring the container.
Inventors
- 👤 Toshimasa Norita
- 👤 Hisato Ibara
- 👤 Masahiro Murakami
- 👤 Masao Okano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:41
CPC Classifications
C; C10; C10B; C10B7/00; C10B7/14; C10B49/00; C10B49/02; C10B53/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
77 words
A method of producing char from the waste liquor of a pulp manufacturing process, which comprises confining said waste liquor in a container and feeding said container into an air heating furnace in a manner such that said container is contacted countercurrently with heated air without rotating or stirring the container, whereby said waste liquor is solidified and carbonized and wherein the carbonizing temperature is 200° to 400°C and the carbonizing time is more than 30 minutes.
Claim 2
Independent Claim
77 words
A method of producing char from the waste liquor of a pulp manufacturing process, which comprises confining said waste liquor in a container and feeding said container into an air heating furnace in a manner such that said container is contacted countercurrently with heated air without rotating or stirring the container, whereby said waste liquor is solidified and carbonized and wherein the carbonizing temperature is 200° to 400°C and the carbonizing time is more than 30 minutes.
Claim 3
Dependent Claim
43 words
The method of claim 1, wherein said confining and feeding steps comprise adding the waste liquor dropwise onto a continuously moving conveyor to solidify and to carbonize said liquor while preventing the waste liquor from flowing out toward the periphery of the conveyor.
Claim 4
Dependent Claim
15 words
The method of claim 1, wherein said container is fabricated from box-shaped paper or paperboard.
Claim 5
Dependent Claim
24 words
The method of claim 1, wherein said waste liquor is selected from the group consisting of sulfite, sulfate, soda, semi-chemical and chemical-grounded pulp liquors.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |