US4045519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing dialkylphosphites
Assignee: Ethyl Corp
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Filing: 1976-09-16
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Granted: 1977-08-30
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Expires: 1996-09-16
Abstract
Abstract Dialkylphosphites are made by adding PCl 3 to a mixture of water and alkanol and distilling product from the resultant reaction mixture leaving a distillation residue. Alkanol is added to the residue and the mixture reacted at elevated temperature to yield additional dialkylphosphite.
Inventors
- 👤 William E. Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:02
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/141; C07F9/142
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
107 words
A process for making a di-C 1-4 alkylphosphite in high yield, said process comprising a. forming a mixture of about 1.8-2.5 moles of a C 1-4 alkanol and about 0.5 to 1.2 moles of water, b. adding about one mole PCl 3 to said mixture and reacting at about 0° to 70° C., c. distilling dialkylphosphite from the reaction product of (b), leaving a distillation residue, d. adding about 0.5 to 5 parts by weight of said alkanol to each part by weight of said distillation residue and heating the resultant mixture at 65° to 140° C., and e. distilling additional dialkylphosphite from the final reaction product.
Claim 2
Dependent Claim
107 words
A process for making a di-C 1-4 alkylphosphite in high yield, said process comprising a. forming a mixture of about 1.8-2.5 moles of a C 1-4 alkanol and about 0.5 to 1.2 moles of water, b. adding about one mole PCl 3 to said mixture and reacting at about 0° to 70° C., c. distilling dialkylphosphite from the reaction product of (b), leaving a distillation residue, d. adding about 0.5 to 5 parts by weight of said alkanol to each part by weight of said distillation residue and heating the resultant mixture at 65° to 140° C., and e. distilling additional dialkylphosphite from the final reaction product.
Claim 3
Dependent Claim
12 words
A process of claim 1 wherein said alkanol is a primary alkanol.
Claim 4
Dependent Claim
12 words
A process of claim 2 wherein said alkanol is a primary butanol.
Claim 5
Dependent Claim
40 words
A process of claim 3 wherein an inert water-insoluble solvent is included in step (d) and the resultant mixture of said alkanol, distillation residue and inert solvent is heated at reflux and water is separated and removed from refluxing distillate.
Claim 6
Dependent Claim
10 words
A process of claim 4 wherein said butanol is n-butanol.
References Cited (Backward Citations)
US2794820A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |