Patent DE921082C successfully refreshed from Google Patents.
US4642287A
Expired / Lapsed
US
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Process for pretreating biomasses in advance of their enzymatic treatment
Assignee: Research Association for Petroleum Alternatives Development
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Filing: 1984-04-05
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Granted: 1987-02-10
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Expires: 2004-04-05
Abstract
Abstract An improved process for pretreating biomasses in advance of their enzymatic treatment is provided which process comprises subjecting a biomass together with an aqueous solution of an alkaline compound to kneading and reaction in a biaxial extruder, and which process has advantages that a continuous treatment in a very short time is possible, and the heat quantity required for the pretreatment is greatly reduced.
Inventors
- 👤 Takeshi Inoi
- 👤 Toshiaki Akabane
- 👤 Yasuhiro Kurokawa
- 👤 Shingo Matsuoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:16
CPC Classifications
C; C13; C13K; C13K1/00; C13K1/02; C12; C12P; C12P19/00; C12P19/14; C12P2201/00; Y; Y02; Y02E; Y02E50/00; Y02E50/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
63 words
In the process of pretreating a biomass in advance of cellulose enzymatic treatment that includes contacting the biomass in finely divided form with an aqueous solution of an alkaline compound, the improvement comprising reducing the pretreatment time to one minute or less by introducing the biomass and the alkaline compound into a biaxial extruder and carrying out the pretreatment in said biaxial extruder.
Claim 2
Dependent Claim
63 words
In the process of pretreating a biomass in advance of cellulose enzymatic treatment that includes contacting the biomass in finely divided form with an aqueous solution of an alkaline compound, the improvement comprising reducing the pretreatment time to one minute or less by introducing the biomass and the alkaline compound into a biaxial extruder and carrying out the pretreatment in said biaxial extruder.
Claim 3
Dependent Claim
25 words
A process according to claim 1 wherein said alkaline compound is NaOH or Na 2 S or a mixture of NaOH and Na 2 S.
Claim 4
Dependent Claim
27 words
A process according to claim 2 wherein said biomass and said aqueous solution of an alkaline compound are mixed together before being introduced into said biaxial extruder.
Claim 5
Dependent Claim
30 words
A process according to claim 3 wherein said biomass is a material obtained by cutting and grinding a biomass and has an average particle diameter of 15 mm or less.
Claim 6
Dependent Claim
46 words
A process according to claim 3 wherein the amount of said aqueous solution of an alkaline compound is in the range of 0.6 to 2 times by weight the amount of said biomass, and the alkaline compound is 10 to 24% by weight of said biomass.
Claim 7
Dependent Claim
25 words
A process according to claim 3 wherein the temperature of said mixture in said biaxial extruder is in the range of 60° to 230° C.
Claim 8
Dependent Claim
36 words
A process according to claim 3 wherein said biomass is at least one member selected from the group consisting of bagasse, Siebold's beech, silver magnolia, Yezo spruce (Picea jezoensis CARR), white birch, corn rachis and paper.
Claim 9
Dependent Claim
34 words
A process according to claim 2 wherein said biomass and said aqueous solution of an alkali compound are separately introduced into said biaxial extruder so that mixing thereof only occurs in the biaxial extruder.
Claim 10
Dependent Claim
30 words
A process according to claim 8 wherein said biomass is a material obtained by cutting and grinding a biomass and has an average particle diameter of 30 mm or less.
Claim 11
Dependent Claim
56 words
A process according to claim 8 wherein said aqueous solution of an alkaline compound, in an amount of 3 to 15 times by weight the amount of said biomass is injected into said biaxial extruder separately from the introduction of the biomass into the extruder and said alkaline compound is 3-30% by weight of said biomass.
Claim 12
Dependent Claim
22 words
A process according to claim 8 wherein the temperature in said biaxial extruder is in the range of 60° to 230° C.
Claim 13
Dependent Claim
36 words
A process according to claim 8 wherein said biomass is at least one member selected from the group consisting of bagasse, Siebold's beech, silver magnolia, Yezo spruce (Picea jezoenis CARR), white birch, corn rachis and papers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-02-09 | 1990-08-11 | 1991-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-09 | 1994-08-11 | 1995-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-09 | 1998-08-11 | 1999-02-10 | $7700.00 | Window Closed / Lapsed |