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US4283580A
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Process for the production of alkylene glycols
Assignee: Nippon Shokubai Co Ltd
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Filing: 1979-09-19
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Granted: 1981-08-11
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Expires: 1999-09-19
Abstract
Abstract A process for the production of alkylene glycols, which comprises causing a corresponding alkylene carbonate to react with water in the presence of a catalyst of at least one member selected from the group consisting of molybdenum and tungsten.
Inventors
- 👤 Hiroshi Odanaka
- 👤 Minoru Saotome
- 👤 Toshihiko Kumazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:07
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/09; C07C29/095; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
106 words
A process for the production of substituted or unsubstituted ethylene glycols, which comprises causing a corresponding substituted or unsubstituted ethylene carbonate of the formula ##STR3## wherein, R 1 , R 2 , R 3 and R 4 each denote a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, an aryl group having 6 carbon atoms, an alkenyl group having 2 or 3 carbon atoms or a cycloalkyl group having 3 to 6 carbon atoms, to react with water in the presence of a catalyst of at least one member selected from the group consisting of molybdenum and tungsten in metal or compound form.
Claim 2
Dependent Claim
106 words
A process for the production of substituted or unsubstituted ethylene glycols, which comprises causing a corresponding substituted or unsubstituted ethylene carbonate of the formula ##STR3## wherein, R 1 , R 2 , R 3 and R 4 each denote a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, an aryl group having 6 carbon atoms, an alkenyl group having 2 or 3 carbon atoms or a cycloalkyl group having 3 to 6 carbon atoms, to react with water in the presence of a catalyst of at least one member selected from the group consisting of molybdenum and tungsten in metal or compound form.
Claim 3
Dependent Claim
23 words
A process according to claim 1, wherein the amount of the catalyst is not less than 0.01 mol% based on the ethylene carbonate.
Claim 4
Dependent Claim
23 words
A process according to claim 2, wherein the amount of the catalyst is from 0.05 to 10 mol% based on the ethylene carbonate.
Claim 5
Dependent Claim
24 words
A process according to claim 1, wherein the reaction is carried out at a temperature in the range of from 20° to 180° C.
Claim 6
Dependent Claim
16 words
A process according to claim 1, wherein the ethylene carbonate is ethylene carbonate or propylene carbonate.
Claim 7
Dependent Claim
12 words
A process according to claim 1, wherein the catalyst is metallic molybdenum.
Claim 8
Dependent Claim
13 words
A process according to claim 1, wherein the catalyst is a molybdenum compound.
Claim 9
Dependent Claim
17 words
A process according to claim 7, wherein the molybdenum compound is molybdic acid or a salt thereof.
Claim 10
Dependent Claim
17 words
A process according to claim 8, wherein the salt of molybdic acid is an alkali metal salt.
Claim 11
Dependent Claim
12 words
A process according to claim 1, wherein the catalyst is metallic tungsten.
Claim 12
Dependent Claim
13 words
A process according to claim 1, wherein the catalyst is a tungsten compound.
Claim 13
Dependent Claim
17 words
A process according to claim 11, wherein the tungsten compound is tungstic acid or a salt thereof.
Claim 14
Dependent Claim
17 words
A process according to claim 12, wherein the salt of tungstic acid is an alkali metal salt.
Claim 15
Dependent Claim
22 words
A process according to claim 1, wherein the amount of water is 1.01 to 5 mols per mol of the ethylene carbonate.
Claim 16
Dependent Claim
22 words
A process according to claim 14, wherein the amount of water is 1.01 to 2.5 mols per mol of the ethylene carbonate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |