Patent US4806475A successfully refreshed from Google Patents.
US4806475A
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Alkaline peroxide treatment of agricultural byproducts
Assignee: United States Department of Agriculture
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Filing: 1986-09-29
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Granted: 1989-02-21
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Expires: 2006-09-29
Abstract
Abstract Nonwoody lignocellulosic portions of plant fruits, roots, and tubers, such as sugar beet pulp, citrus pulp, seed hulls, and cereal bran are treated with hydrogen peroxide under alkaline conditions thereby delignifying the materials and rendering the cellulose and hemicellulose highly available for subsequent use. The products are characterized by enhanced water-binding capacity of the cellulose as indicated by high water swellability. The products are also nontoxic and thereby useful as carbohydrate sources in ruminant feeds, as microbial feedstocks, and as sources of dietary fiber for humans and other monogastrics.
Inventors
- 👤 John M. Gould
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:07
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; C08B; C08B1/00; C08H; C08H6/00; 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
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
89 words
A method for treating a substrate to yield a cellulosic product wherein said substrate is a nonwoody lignocellulosic portion of a fruit, root, or tuber, said method comprising treating said substrate in a reaction medium comprising an aqueous solution of strong alkali and hydrogen peroxide so as to solubilize at least a portion of the lignin and to enhance the water-binding capacity of the cellulose, thereby producing a water-soluble lignin-containing fraction and a water-insoluble cellulose-containing fraction, and recovering the water-insoluble fraction from the reaction medium as said cellulosic product.
Claim 2
Independent Claim
89 words
A method for treating a substrate to yield a cellulosic product wherein said substrate is a nonwoody lignocellulosic portion of a fruit, root, or tuber, said method comprising treating said substrate in a reaction medium comprising an aqueous solution of strong alkali and hydrogen peroxide so as to solubilize at least a portion of the lignin and to enhance the water-binding capacity of the cellulose, thereby producing a water-soluble lignin-containing fraction and a water-insoluble cellulose-containing fraction, and recovering the water-insoluble fraction from the reaction medium as said cellulosic product.
Claim 3
Dependent Claim
14 words
A method as described in claim 1 wherein said substrate is sugar beet pulp.
Claim 4
Dependent Claim
13 words
A method as described in claim 1 wherein said substrate is citrus pulp.
Claim 5
Dependent Claim
13 words
A method as described in claim 1 wherein said substrate is seed hulls.
Claim 6
Dependent Claim
13 words
A method as described in claim 1 wherein said substrate is cereal bran.
Claim 7
Dependent Claim
28 words
A method as described in claim 1 wherein said strong alkali is sodium hydroxide, and the pH is controlled within the range of about 11.2 to about 11.8.
Claim 8
Independent Claim
98 words
A method for treating a substrate to yield a cellulosic product wherein said substrate is a nonwoody lignocellulosic component of a plant, said method comprising treating said substrate in a reaction medium comprising an aqueous solution of strong alkali and hydrogen peroxide at a pH in the range of about 11.2 to about 11.8 so as to solubilize at least a portion of the lignin and to enhance the water-binding capacity of the cellulose, thereby producing a lignin-containing water-soluble fraction and a cellulose-containing water-insoluble fraction, and recovering the water-insoluble fraction from the reaction medium as said cellulosic product.
Claim 9
Independent Claim
98 words
A method for treating a substrate to yield a cellulosic product wherein said substrate is a nonwoody lignocellulosic component of a plant, said method comprising treating said substrate in a reaction medium comprising an aqueous solution of strong alkali and hydrogen peroxide at a pH in the range of about 11.2 to about 11.8 so as to solubilize at least a portion of the lignin and to enhance the water-binding capacity of the cellulose, thereby producing a lignin-containing water-soluble fraction and a cellulose-containing water-insoluble fraction, and recovering the water-insoluble fraction from the reaction medium as said cellulosic product.
Claim 10
Dependent Claim
27 words
A method as described in claim 7 wherein said substrate is selected from the group consisting of sugar beet pulp, citrus pulp, seed hulls, and cereal bran.
Claim 11
Dependent Claim
14 words
A method as described in claim 8 wherein said strong alkali is sodium hydroxide.
Claim 12
Dependent Claim
10 words
The cellulosic product produced by the method of claim 1.
Claim 13
Dependent Claim
10 words
The cellulosic product produced by the method of claim 2.
Claim 14
Dependent Claim
10 words
The cellulosic product produced by the method of claim 3.
Claim 15
Dependent Claim
10 words
The cellulosic product produced by the method of claim 4.
Claim 16
Dependent Claim
10 words
The cellulosic product produced by the method of claim 5.
Claim 17
Dependent Claim
10 words
The cellulosic product produced by the method of claim 6.
Claim 18
Dependent Claim
10 words
The cellulosic product produced by the method of claim 7.
Claim 19
Dependent Claim
10 words
The cellulosic product produced by the method of claim 8.
Claim 20
Dependent Claim
10 words
The cellulosic product produced by the method of claim 9.
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) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |