Patent US4181796A successfully refreshed from Google Patents.
US4181796A
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Process for obtaining xylan and fibrin from vegetable raw material containing xylan
Assignee: Sunopta Inc
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Filing: 1977-07-18
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Granted: 1980-01-01
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Expires: 1997-07-18
Abstract
Abstract A process for the production of xylan and fibrinous material from vegetable raw material by treating the raw material with saturated steam at a temperature of from 160 DEG to 230 DEG C. for a period from 2 minutes to 4 hours.
Inventors
- 👤 Hans-Hermann Dietrichs
- 👤 Michael Sinner
- 👤 Fritz Opderbeck
- 👤 Karl-Heinz Brachthauser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:50
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0057; C12; C12P; C12P19/00; C12P19/14; C13; C13K; C13K1/00; C13K1/02; C13K13/00; C13K13/002
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
88 words
A process for the production of xylan and fibrinous material from xylan-containing vegetable raw material which can be disintegrated by steam pressure treatment and defibration comprising the steps of (a) treating the raw material with saturated steam under pressure at a temperature of from about 175°-220° C. for a period of two minutes to four hours, (b) lixiviating the treated vegetable raw material with aqueous solution whereby xylan and xylan fragments are extracted from the disintegrated raw material producing an aqueous xylan extract solution and a fibrinous residue.
Claim 2
Dependent Claim
88 words
A process for the production of xylan and fibrinous material from xylan-containing vegetable raw material which can be disintegrated by steam pressure treatment and defibration comprising the steps of (a) treating the raw material with saturated steam under pressure at a temperature of from about 175°-220° C. for a period of two minutes to four hours, (b) lixiviating the treated vegetable raw material with aqueous solution whereby xylan and xylan fragments are extracted from the disintegrated raw material producing an aqueous xylan extract solution and a fibrinous residue.
Claim 3
Dependent Claim
26 words
The process according to claim 1, wherein the xylan and xylan fragments in the extract solution are hydrolized by treatment with hydrolyzing agents to produce xylose.
Claim 4
Dependent Claim
17 words
The process according to claim 2, wherein the xylose is reduced by catalytic hydrogenation to obtain xylitol.
Claim 5
Dependent Claim
28 words
The process according to claim 1 wherein the fibrinous residue obtained after lixiviation of the disintegrated vegetable raw material is washed with water to obtain a fibrinous material.
Claim 6
Dependent Claim
15 words
The process according to claim 1, wherein the vegetable fibrinous residue is bleached with oxygen.
Claim 7
Dependent Claim
18 words
The process according to claim 1, wherein the fibrinous residue obtained is subjected to hydrolysis to produce glucose.
Claim 8
Dependent Claim
25 words
The process of claim 1 wherein the lixiviation is effected in an alkaline solution containing from about 0.1 to 4% by weight of sodium hydroxide.
Claim 9
Dependent Claim
25 words
The process of claim 1 wherein the xylan extract solution is purified by treatment with a strongly basic ion exchange resin in the OH form.
Claim 10
Dependent Claim
13 words
The process of claim 8 wherein the xylose is recovered in crystalline form.
Claim 11
Dependent Claim
30 words
The process of claim 1 wherein the fibrinous residue produced in step (b) is lixiviated with a dilute alkaline solution forming a fibrinous residue and a second xylan extract solution.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-31 | 1983-07-02 | 1984-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-31 | 1987-07-02 | 1988-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-31 | 1991-07-02 | 1992-01-01 | $7700.00 | Window Closed / Lapsed |