US3963788A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyhydric alcohol production using ruthenium zeolite catalyst
Assignee: Individual
•
Filing: 1974-11-05
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Granted: 1976-06-15
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Expires: 1994-11-05
Abstract
Abstract Process for the conversion of carbohydrates to polyhydric alcohols. Carbohydrates, such as corn starch hydrolyzate, glucose, and invert sugar, are converted to polyhydric alcohols by hydrogenation at high pressure in the presence of a ruthenium-containing alumino-silicate zeolite catayst in which the silica/alumina mol ratio is greater than three, and in particular ruthenium on a Y type zeolite in the hydrogen form. This acid stable catalyst gives good conversion with high selectivity to sorbitol when corn starch hydrolyzate in aqueous solution is used as the starting material.
Inventors
- 👤 Walter M. Kruse
- 👤 Leon W. Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:29
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/90; B01J23/00; B01J23/90; B01J23/96; B01J29/04; B01J29/06; B01J29/064; B01J29/068; B01J38/00; B01J38/48; B01J38/60; C; C07; C07C; C07C31/00; C07C31/18; C07C31/26; C13; C13K; C13K1/00; C13K1/06; B01J29/08; B01J29/10; B01J29/12; B01J29/126; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
87 words
A process for the production of a polyhydric alcohol from a carbohydrate selected from the group consisting of monosaccharides, readily hydrolyzable polysaccharides and mixtures thereof, which comprises contacting said carbohydrate in an aqueous medium with hydrogen at a temperature in the range of about 100° to about 200°C and a pressure of at least about 100 psig. in the presence of a ruthenium-containing aluminosilicate zeolite catalyst of the molecular sieve type having pores of uniform size and having a silica/alumina mol ratio of at least about 3.
Claim 2
Dependent Claim
87 words
A process for the production of a polyhydric alcohol from a carbohydrate selected from the group consisting of monosaccharides, readily hydrolyzable polysaccharides and mixtures thereof, which comprises contacting said carbohydrate in an aqueous medium with hydrogen at a temperature in the range of about 100° to about 200°C and a pressure of at least about 100 psig. in the presence of a ruthenium-containing aluminosilicate zeolite catalyst of the molecular sieve type having pores of uniform size and having a silica/alumina mol ratio of at least about 3.
Claim 3
Dependent Claim
18 words
A process according to claim 1 in which said alumina/silicate zeolite is a zeolite of the Y type.
Claim 4
Dependent Claim
20 words
A process according to claim 1 in which said catalyst contains about 0.1% to about 5% by weight of ruthenium.
Claim 5
Dependent Claim
16 words
A process according to claim 3 in which said ruthenium is present as the free metal.
Claim 6
Dependent Claim
25 words
A process according to claim 1 in which the weight ratio of ruthenium to carbohydrate is in the range of about 0.01% to about 0.1%.
Claim 7
Dependent Claim
19 words
A process according to claim 1 in which the pH of said aqueous medium is at least about 3.
Claim 8
Dependent Claim
14 words
A process according to claim 1 in which said carbohydrate is a polysaccharide-containing carbohydrate.
Claim 9
Dependent Claim
16 words
A process according to claim 7 in which said carbohydrate is a starch or cellulose hydrolyzate.
Claim 10
Dependent Claim
14 words
A process according to claim 8 in which said carbohydrate is a starch hydrolyzate.
Claim 11
Dependent Claim
15 words
A process according to claim 9 in which said starch hydrolyzate is corn starch hydrolyzate.
Claim 12
Dependent Claim
55 words
A process according to claim 7 in which the reaction between said carbohydrate and hydrogen is carried out in two stages, the first stage being carried out at a temperature in the range of about 100 to about 175°C. and the second stage being carried out at a temperature of about 170 to about 200°C.
Claim 13
Dependent Claim
24 words
A process according to claim 7 in which the pH of the reaction medium is in the range of about 3.0 to about 4.5.
Claim 14
Dependent Claim
26 words
A process according to claim 1 in which said zeolite has an effective pore size in the hydrogen form of at least about 8 Angstrom units.
References Cited (Backward Citations)
US2868847A
Cited
US3055840A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |