US4713334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the saccharification of celluloses
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1986-03-27
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Granted: 1987-12-15
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Expires: 2006-03-27
Abstract
Abstract A process for the saccharification of celluloses is provided. More particularly, a solution obtained after the degradative saccharification of cellulosic materials with cellulases is separated into a liquid portion containing saccharides and a solid matter. Cellulases are recovered from said liquid portion containing saccharides, while said solid matter is treated with an aqueous pH-buffered solution, or an aqueous solution, alcoholic aqueous solution or aqueous pH-buffered solution of polysaccharides or oligosaccharides, or aqueous or aqueous pH-buffered solution of alcohols to recover the cellulases in the solid matter. With the use of this solid matter, newly added cellulosic materials are degradatively saccharified in an aqueous solution or the above-mentioned solutions.
Inventors
- 👤 Shizu Fujishima
- 👤 Fumiko Yaku
- 👤 Tetsuo Koshijima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:32
CPC Classifications
C; C12; C12P; C12P19/00; C12P19/14; Y; Y10; Y10S; Y10S435/00; Y10S435/813
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
72 words
A process for the saccharification of celluloses, comprising degradatively decomposing a cellulosic material by cellulases in the absence of an alcohol to obtain a liquid portion containing saccharides and a solid matter containing cellulases; separating said liquid portion from said solid matter; and degradatively saccharifying additional cellulosic material with the use of said solid matter in an aqueous solution, an aqueous pH-buffered solution or an aqueous pH-buffered solution of polysaccharides or oligosaccharides.
Claim 2
Dependent Claim
72 words
A process for the saccharification of celluloses, comprising degradatively decomposing a cellulosic material by cellulases in the absence of an alcohol to obtain a liquid portion containing saccharides and a solid matter containing cellulases; separating said liquid portion from said solid matter; and degradatively saccharifying additional cellulosic material with the use of said solid matter in an aqueous solution, an aqueous pH-buffered solution or an aqueous pH-buffered solution of polysaccharides or oligosaccharides.
Claim 3
Dependent Claim
25 words
A process for the saccharification of celluloses as set forth in claim 1, wherein said polysaccharide is glucomannan, xylan, galactan, galactoglucomannan, or a mixture thereof.
Claim 4
Dependent Claim
28 words
A process for the saccharification of celluloses as set forth in claim 1, wherein said oligosaccharide is cellobiose, cellotriose, cellotetraose, cellopentaose, cellohexaose, glucose-containing mannooligosaccharide, or a mixture thereof.
Claim 5
Dependent Claim
40 words
A process for the saccharification of celluloses as set forth in claim 1, wherein the concentration of said polysaccharides or oligosaccharides in said aqueous solution, or aqueous pH-buffered solution is within the range of 0.5 to 5 percent by weight.
Claim 6
Dependent Claim
30 words
A process for the saccharification of celluloses as set forth in claim 1, wherein the pH value of said aqueous pH-buffered solutions is within the range of 3.0 to 8.0.
Claim 7
Dependent Claim
36 words
A process for the saccharification of celluloses as set forth in claim 1, wherein said newly added cellulosic materials are degradatively saccharified by said solid matter at a temperature ranging from room temperature to 55° C.
References Cited (Backward Citations)
US4220721A
Cited
US4487831A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |