Patent US5010898A successfully refreshed from Google Patents.
Patent US4649113A successfully refreshed from Google Patents.
US4649113A
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Alkaline peroxide treatment of nonwoody lignocellulosics
Assignee: United States Department of Agriculture
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Filing: 1983-12-28
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Granted: 1987-03-10
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Expires: 2003-12-28
Abstract
Abstract By treating agricultural crop residues and other nonwoody lignocellulosic plant substrates with H 2 O 2 at a controlled pH within the range of about 11.2 to 11.8, the substrates are partially delignified and unprecedented levels of the cellulose and hemicellulose as insoluble fractions are made available for subsequent use. The products of this treatment are nontoxic and are characterized by low crystallinity and near quantitative cellulase digestibility. They are useful as carbohydrate sources in ruminant feeds and as microbial feedstocks for commercial process such as the production of alcohol and generation of single-cell protein.
Inventors
- 👤 John M. Gould
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:48
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/006; A; A23; A23G; A23G3/00; A23G3/34; A23G3/346; A23K; A23K10/00; A23K10/30; A23K10/32; C; C08; C08H; C08H8/00; C12; C12P; C12P7/00; C12P7/02; C12P7/04; C12P7/06; C12P7/08; C12P7/10; A23G2200/00; A23G2200/06; Y; Y02; Y02E; Y02E50/00; Y02E50/10; Y10; Y10S; Y10S426/00; Y10S426/807
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
79 words
A method for treating a lignocellulosic substrate comprising, treating a substrate selected from the group of leaves and stalks and mixtures thereof from nonwoody plants in a reaction medium comprising an aqueous solution of strong alkali and hydrogen peroxide at a controlled pH in the range of about 11.2 to about 11.8 until substantially all of the polysaccharide in said substrate has been made available as a water-insoluble fraction, and recovering said water-insoluble polysaccharide fraction from said reaction medium.
Claim 2
Independent Claim
79 words
A method for treating a lignocellulosic substrate comprising, treating a substrate selected from the group of leaves and stalks and mixtures thereof from nonwoody plants in a reaction medium comprising an aqueous solution of strong alkali and hydrogen peroxide at a controlled pH in the range of about 11.2 to about 11.8 until substantially all of the polysaccharide in said substrate has been made available as a water-insoluble fraction, and recovering said water-insoluble polysaccharide fraction from said reaction medium.
Claim 3
Dependent Claim
17 words
A method as described in claim 1 wherein said lignocellulosic substrate is derived from a monocotyledonous plant.
Claim 4
Dependent Claim
19 words
A method as described in claim 2 wherein said plant is a species belonging to the family of Gramineae.
Claim 5
Dependent Claim
45 words
A method as described in claim 1 wherein said lignocellulosic substrate is an agricultural crop residue selected from the group consisting of corn stalks, corn cobs, corn husks, wheat straw, oat straw, rice straw, barley straw, rye straw, buckwheat straw, flax straw, and mixtures thereof.
Claim 6
Dependent Claim
17 words
A method as described in claim 1 wherein said lignocellulosic substrate is derived from a prairie grass.
Claim 7
Dependent Claim
14 words
A method as described in claim 1 wherein said strong alkali is sodium hydroxide.
Claim 8
Dependent Claim
36 words
A method as described in claim 1 wherein the concentration of residue in the reaction medium is less than about 40 g./l., and the ratio of hydrogen peroxide to residue is at least about 0.25 (w/w).
Claim 9
Dependent Claim
13 words
A method as described in claim 1 wherein said pH is about 11.5.
Claim 10
Dependent Claim
19 words
A method as described in claim 1 and further comprising feeding said water-insoluble polysaccharide fraction to a ruminant animal.
Claim 11
Dependent Claim
18 words
A method as described in claim 9 wherein said fraction is dried prior to feeding to said animal.
Claim 12
Dependent Claim
19 words
A method as described in claim 1 and further comprising digesting said water-insoluble polysaccharide fraction to a fermentable substrate.
Claim 13
Dependent Claim
17 words
A method as described in claim 11 wherein said fermentable substrate is fermented by an ethanol-producing organism.
Claim 14
Dependent Claim
9 words
A product produced by the method of claim 1.
Claim 15
Dependent Claim
9 words
A product produced by the method of claim 3.
Claim 16
Dependent Claim
9 words
A product produced by the method of claim 4.
Claim 17
Dependent Claim
9 words
A product produced by the method of claim 5.
Claim 18
Dependent Claim
9 words
A product produced by the method of claim 8.
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) | 1990-03-09 | 1990-09-08 | 1991-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-09 | 1994-09-08 | 1995-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-09 | 1998-09-08 | 1999-03-10 | $7700.00 | Window Closed / Lapsed |