US4421856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fermentable sugar from the hydrolysis of carbohydrate polymer
Assignee: Millennium Petrochemicals Inc
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Filing: 1981-11-12
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Granted: 1983-12-20
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Expires: 2001-11-12
Abstract
Abstract The yield of fermentable sugar, largely glucose (dextrose), resulting from the acid catalyzed hydrolysis of a carbohydrate polymer such as starch or cellulose can be significantly increased by the addition to the hydrolysate under acid hydrolysis conditions of water soluble non-fermentable carbohydrate such as stillage recovered from a downstream ethanol distillation facility.
Inventors
- 👤 Werner C. Muller
- 👤 Franklyn D. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:11
CPC Classifications
C; C12; C12P; C12P7/00; C12P7/02; C12P7/04; C12P7/06; C12F; C12F3/00; C12F3/10; C13; C13K; C13K1/00; C13K1/02; C13K1/06; Y; Y02; Y02E; Y02E50/00; Y02E50/10; Y10; Y10S; Y10S203/00; Y10S203/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
67 words
In the acid hydrolysis of carbohydrate polymer in which an aqueous slurry of carbohydrate polymer selected from the group consisting of starch and cellulose is hydrolyzed at elevated pressure and temperature in the presence of an acid catalyst to provide a hydrolysate comprising a sterile aqueous solution of fermentable sugar, the improvement which comprises carrying out hydrolysis in the presence of added aqueous water soluble non-fermentable carbohydrate.
Claim 2
Dependent Claim
67 words
In the acid hydrolysis of carbohydrate polymer in which an aqueous slurry of carbohydrate polymer selected from the group consisting of starch and cellulose is hydrolyzed at elevated pressure and temperature in the presence of an acid catalyst to provide a hydrolysate comprising a sterile aqueous solution of fermentable sugar, the improvement which comprises carrying out hydrolysis in the presence of added aqueous water soluble non-fermentable carbohydrate.
Claim 3
Dependent Claim
35 words
The process of claim 1 wherein a preliminary hydrolysis step is followed by a further hydrolysis step and following said preliminary hydrolysis the temperature and pressure of the partial hydrolysate is at least partially reduced.
Claim 4
Dependent Claim
25 words
The process of claim 1 wherein the carbohydrate polymer is starch derived from wet milled cereal grain or starch derived from amylaceous root or tuber.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein the carbohydrate polymer is cellulose.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein the carbohydrate polymer is starch derived from wet milled corn or milo.
Claim 7
Dependent Claim
50 words
The process of claim 1 wherein the hydrolysate is fermented to provide dilute aqueous ethanol, the dilute aqueous ethanol is concentrated by distillation and the stillage resulting from said distillation is used as the source of added water soluble non-fermentable carbohydrate in the hydrolysis of a further quantity of hydrolysate.
Claim 8
Dependent Claim
14 words
The process of claim 1 wherein the carbohydrate polymer feed is slurried with stillage.
Claim 9
Dependent Claim
21 words
The process of claim 6 wherein the acid hydrolysis catalyst is neutralized with base prior to subjecting the hydrolysate to fermentation.
Claim 10
Dependent Claim
26 words
The process of claim 8 wherein salt resulting from neutralization of hydrolysis catalyst is reconverted to acid by contact with a strong acid ion exchange resin.
References Cited (Backward Citations)
US4287304A
Cited
US4330625A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |