US3627636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of xylitol
Assignee: Suomen Sokeri Oy
•
Filing: 1969-10-02
•
Granted: 1971-12-14
•
Expires: 1989-10-02
Abstract
Abstract A process for producing xylitol from lignin-free hemicellulose materials wherein the polysaccharides have been converted to monosaccharides, subjecting said materials to fermentation with a hexose fermenting yeast and thereafter hydrogenating said aqueous medium.
Inventors
- 👤 Gerald Myer Jaffe
- 👤 William Szkrybalo
- 👤 Peter Hans Weinert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:12
CPC Classifications
C; C13; C13K; C13K13/00; C13K13/002; Y; Y10; Y10S; Y10S435/00; Y10S435/803
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
11 words
The process of claim 1 wherein said yeast is Baker''s yeast.
Claim 2
Dependent Claim
29 words
The process of claim 2 wherein said fermentation is carried out at a pH of 3 to 7 and at a temperature of from 5* to 40 * C.
Claim 3
Dependent Claim
90 words
A process for producing xylitol from lignin-free hemicellulosic materials wherein the polysaccharides contained therein have been converted to monosaccharides comprising: a. fermenting said material in an aqueous medium with a hexose fermentating yeast which is inert to pentose; b. passing said fermented aqueous medium through a cationic ion exchange resin bed and through an anionic ion exchange resin bed to produce an aqueous medium containing xylose free of hexoses; c. hydrogenating the aqueous effluent from the anionic exchange resin bed to convert the xylose in said aqueous medium to xylitol.
Claim 4
Dependent Claim
18 words
The process of claim 4 wherein said hydrogenation is carried out in the presence of a Raney-nickel catalyst.
Claim 5
Dependent Claim
11 words
The process of claim 4 wherein said yeast is Baker''s yeast.
Claim 6
Dependent Claim
28 words
The process of claim 4 wherein said fermentation is carried out at a pH of 3 to 7 and at a temperature of from 5* to 40* C.
Claim 7
Dependent Claim
94 words
A process for producing xylose from aqueous wood extracts comprising: a. hydrolyzing said aqueous wood extracts in an aqueous medium with an acid hydrolyzing agent to form an aqueous solution containing the lignins as a water insoluble precipitate; b. removing the precipitated lignins from the resultant aqueous solution; c. fermenting said aqueous solution with a hexose fermenting yeast which is inert to pentoses; d. passing said fermented aqueous medium through a cationic ion exchange resin bed then through an anionic ion exchange resin bed to produce an aqueous medium containing xylose free of hexose.
Claim 8
Dependent Claim
14 words
The process of claim 8 wherein said hydrolysis is carried out with sulfuric acid.
Claim 9
Dependent Claim
11 words
The process of claim 8 wherein said yeast is Baker''s yeast.
Claim 10
Dependent Claim
105 words
A process for producing xylitol from aqueous wood extracts comprising: a. hydrolyzing said aqueous wood extracts in an aqueous medium with an acid hydrolyzing agent to form an aqueous solution containing the lignins as a precipitate; b. removing said lignins from said aqueous solution; c. fermenting said lignin-free aqueous solution with a hexose fermenting yeast which is inert to pentoses; d. passing said fermented aqueous medium through a cationic ion exchange resin bed and through an anionic ion resin exchange bed to produce an aqueous effluent containing xylose free of hexose; and e. hydrogenating said aqueous effluent containing xylose to convert the xylose to xylitol.
Claim 11
Dependent Claim
18 words
The process of claim 11 wherein said hydrogenation is carried out in the presence of a Raney-nickel catalyst.
Claim 12
Dependent Claim
11 words
The process of claim 11 wherein said yeast is Baker''s yeast.
Claim 13
Dependent Claim
87 words
A process of producing xylose from spent sulfite liquors containing lignins and monosaccharides comprising: a. passing said spent sulfite liquors in an aqueous medium through an anionic ion exchange resin bed to remove the lignins from said aqueous medium; b. fermenting the lignin-free aqueous effluent with a hexose fermenting yeast which is inert to pentoses; and c. passing said fermented aqueous effluent through a cationic ion exchange resin bed and through an anionic ion exchange resin bed to produce an aqueous effluent containing xylose free of hexoses.
Claim 14
Dependent Claim
11 words
The process of claim 14 wherein said yeast is Baker''s yeast.
Claim 15
Dependent Claim
29 words
The process of claim 14 wherein said fermentation is carried out at a pH of 3 to 7 and at a temperature of from 5* to 40 * C.
Claim 16
Dependent Claim
99 words
A process of producing xylitol from spent sulfite liquors containing lignins and monosaccharides comprising: a. passing said spent sulfite liquors in an aqueous medium through an anionic ion exchange resin bed to remove the lignins from said aqueous medium; b. fermenting said lignin-free aqueous medium with a hexose fermenting yeast which is inert to pentoses; c. passing said fermented aqueous medium through a cationic ion exchange resin bed and through an anionic ion exchange resin bed to produce an aqueous effluent containing xylose free of hexose; and d. hydrogenating said aqueous effluent to convert the xylose therein to xylitol.
Claim 17
Dependent Claim
11 words
The process of claim 17 wherein said yeast is Baker''s yeast.
Claim 18
Dependent Claim
28 words
The process of claim 17 wherein said fermentation is carried out at a pH of 3 to 7 and at a temperature of from 5* to 40* C.
Claim 19
Dependent Claim
18 words
The process of claim 17 wherein said hydrogenation is carried out in the presence of a Raney-nickel catalyst.
References Cited (Backward Citations)
US2142739A
Cited
US3479248A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |