Patent US3721682A successfully refreshed from Google Patents.
US3721682A
Expired / Lapsed
US
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Manufacture of benzylidene sorbitols
Assignee: New Japan Chemical Co Ltd
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Filing: 1970-10-05
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Granted: 1973-03-20
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Expires: 1990-10-05
Abstract
Abstract In reacting an aqueous solution of sorbitol with benzaldehyde in the presence of a dehydrating catalyst to produce a benzylidene sorbitol, a method of this invention comprises adding cyclohexane to the reaction system in an amount of five to 20 weight parts based on one weight part of the benzaldehyde, heating with stirring the reaction system to effect the reaction between sorbitol and benzaldehyde while boiling an azeotropic mixture of cyclohexane and water, said azeotropic mixture being condensed and separated to remove the water from the reaction system and recycle the cyclohexane to the system, and recovering the resultant benzylidene sorbitol thus produced.
Inventors
- 👤 K Murai
- 👤 G Akazome
- 👤 Y Choshi
- 👤 T Kobayashi
- 👤 A Tsuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:57
CPC Classifications
C; C07; C07D; C07D493/00; C07D493/02; C07D493/04; C07D317/00; C07D317/08; C07D317/10; C07D317/14; C07D317/18; C07D317/20; C07D319/00; C07D319/04; C07D319/06; C07D493/12; C07D493/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
24 words
The process of claim 1, in which said benzaldehyde is used in an amount of 1 to 3.2 moles per mole of the sorbitol.
Claim 2
Dependent Claim
24 words
the process of claim 1, in which said cyclohexane is used in an amount of 8 to 15 times the weight of the benzaldehyde.
Claim 3
Dependent Claim
59 words
The process of claim 1, in which said cyclohexane is added to the reaction system in combination with 0.5 to 20 weight percent of a water-soluble organic polar solvent, based on the weight of the cyclohexane, said water-soluble organic polar solvent being selected from the group consisting of N,N-dimethyl formamide, dimethyl sulfoxide, dioxane, sulfolane, methanol, ethanol, propanol, and butanol.
Claim 4
Dependent Claim
28 words
The process of claim 4, in which said water-soluble organic polar solvent is a mixture of (a) methanol, ethanol, propanol or butanol and (b) dimethylformamide or dimethyl sulfoxide.
Claim 5
Dependent Claim
30 words
The process of claim 4 in which said water-soluble organic polar solvent is used in an amount of 1.0 to 10 weight percent, based on the weight of the cyclohexane.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |