US4239906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for obtaining a purified cellulose product from corn hulls
Assignee: Intercontinental Great Brands LLC
•
Filing: 1979-06-07
•
Granted: 1980-12-16
•
Expires: 1999-06-07
Abstract
Abstract A cellulose product containing hemicellulose derived from corn hulls is treated under acidic conditions to obtain purified cellulose having present at least about 70 percent alpha-cellulose. Hemicellulose or a xylose-containing solution may also be obtained.
Inventors
- 👤 Richard L. Antrim
- 👤 Yuk-Charn Chan
- 👤 John R. Crary, Jr.
- 👤 Donald W. Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:07
CPC Classifications
C; C08; C08B; C08B1/00; C08B37/00; C08B37/0006; C08B37/0057; C13; C13K; C13K13/00; C13K13/002; D; D21; D21C; D21C9/00; D21C9/08
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
61 words
In a method for treating corn hulls whereby the corn hulls are treated to solubilize non-carbohydrate material and to provide an impure cellulose product containing hemicellulose, the improvement comprising treating said cellulose product under acidic conditions whereby the hemicellulose is solubilized and a purified cellulose product having present at least about 70 percent alpha-cellulose, on a dry weight basis, is obtained.
Claim 2
Dependent Claim
61 words
In a method for treating corn hulls whereby the corn hulls are treated to solubilize non-carbohydrate material and to provide an impure cellulose product containing hemicellulose, the improvement comprising treating said cellulose product under acidic conditions whereby the hemicellulose is solubilized and a purified cellulose product having present at least about 70 percent alpha-cellulose, on a dry weight basis, is obtained.
Claim 3
Dependent Claim
18 words
A method for treating corn hulls as defined in claim 1, wherein the impure cellulose product comprises holocellulose.
Claim 4
Dependent Claim
57 words
A method for treating corn hulls as defined in claim 2, wherein the impure cellulose product is treated under acidic conditions at a pH of from about 2.0 to about 5.5 to obtain from about 45 to about 55 percent hemicellulose and a cellulose product containing at least about 70 percent alpha-cellulose on a dry weight basis.
Claim 5
Dependent Claim
30 words
A method for treating corn hulls as defined in claim 3, wherein the impure cellulose is treated under acidic conditions at a pH of from about 3.0 to about 4.5.
Claim 6
Dependent Claim
32 words
A method for treating corn hulls as defined in claim 4, wherein the impure cellulose product is treated under acidic conditions at a temperature of from about 75° to about 100° C.
Claim 7
Dependent Claim
32 words
A method for treating corn hulls as defined in claim 5, wherein the impure cellulose product is treated under acidic conditions for a period of from about 1 to about 120 minutes.
Claim 8
Dependent Claim
32 words
A method for treating corn hulls as defined in claim 6, wherein the impure cellulose product is treated under acidic conditions for a period of from about 5 to about 30 minutes.
Claim 9
Dependent Claim
53 words
A method for treating corn hulls as defined in claim 2, wherein the impure cellulose product is treated under acidic conditions at a pH of less than about 1.0 to obtain a solution containing xylose and a cellulose product containing from about 80 to about 87 percent alpha-cellulose on a dry weight basis.
Claim 10
Dependent Claim
29 words
A method for treating corn hulls as defined in claim 8, wherein the impure cellulose product is treated under acidic conditions at a temperature of above about 90° C.
Claim 11
Dependent Claim
33 words
A method for treating corn hulls as defined in claim 9, wherein the impure cellulose product is treated under acidic conditions for a period of from about 30 minutes to about 24 hours.
Claim 12
Dependent Claim
31 words
A method of treating corn hulls as defined in claim 10, wherein the impure cellulose is treated under acidic conditions for a period of from about 4 to about 6 hours.
Claim 13
Dependent Claim
42 words
A method for treating corn hulls as defined in claim 1, wherein the impure cellulose product is treated under acidic conditions to obtain a purified cellulose product having present from about 80 to about 88 percent alpha-cellulose on a dry weight basis.
Claim 14
Dependent Claim
46 words
A method for treating corn hulls as defined in claim 1, wherein the xylan content of the purified cellulose is less than about 5 percent as determined by the phloroglucinol procedure described in Official Methods of Analysis of the Association of Official Analytical Chemists, 10th Edition.
Claim 15
Dependent Claim
26 words
A method of treating corn hulls as defined in claim 1, wherein the impure cellulose product is treated under acidic conditions in two or more steps.
References Cited (Backward Citations)
US1819233A
Cited
US2218567A
Cited
US2709699A
Cited
US2868778A
Cited
US2801955A
Cited
US3716526A
Cited
US3817825A
Cited
US3879373A
Cited
US3937647A
Cited
DE2365457A1
Cited
US3970712A
Cited
DE2358472C3
Cited
US4089848A
Cited
US4102705A
Cited
US4105467A
Cited
US3990904A
Cited
US4038481A
Cited
US4104463A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |