US3864394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing phenylphosphonous dichloride
Assignee: Stauffer Chemical Co
•
Filing: 1973-11-19
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Granted: 1975-02-04
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Expires: 1993-11-19
Abstract
Abstract IT HAVING BEEN FOUND THAT A CRITICAL INTERDEPENDENCE EXISTS BETWEEN THESE FUNCTIONS IF HIGH YIELDS ARE TO BE ATTAINED. Recycling of byproduct diphenylphosphinous chloride can further increase yields. WHEREIN Y represents a yield of at least 60%, t represents reaction time (hours) and the terms A and R include the reaction temperature and molar ratios of SATISFY THE FORMULA: PHOSPHORUS TRICHLORIDE (PC13), and elemental phosphorus under such conditions that the temperature of reaction, time of reaction, and the molar ratio of Phenylphosphonous dichloride can be prepared in high yield in an autoclave process by reacting monochlorobenzene
Inventors
- 👤 Francis A Via
- 👤 Eugene H Uhing
- 👤 Arthur D F Toy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:36
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/50; C07F9/52; C07F9/38; C07F9/40; C07F9/4003; C07F9/4021; C07F9/42; C07F9/48
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
83 words
IN A METHOD FOR PREPARING PHENYLPHOSPHONOUS DICHLORIDE BY THE REACTION OF MONOCHLOROBENZENE, PHOSPHORUS TRICHLORIDE AND ELEMENTAL PHOSPHORUS SUBSTANTIALLY ALL IN THE YELLOW OR WHITE FORM IN AN AUTOCLAVE, THE IMPROVEMENT WHICH COMPRISES REACTING SAID REACTANTS AT A TEMPERATURE (T) WITHIN THE RANGE OF FROM ABOUT 275*C. TO ABOUT 400*C. FOR A PERIOD OF TIME (T) OF FROM ABOUT ONE-FOURTH HOUR TO ABOUT 30 HOURS USING A CONCENTRATION OF PHOSPHORUS TRICHLORIDE, PHOSPHORUS, AND CHLOROBENZENE IN AMOUNTS SUFFICIENT TO PROVIDE A MOLAR RATIO (C) OF
Claim 2
Dependent Claim
83 words
IN A METHOD FOR PREPARING PHENYLPHOSPHONOUS DICHLORIDE BY THE REACTION OF MONOCHLOROBENZENE, PHOSPHORUS TRICHLORIDE AND ELEMENTAL PHOSPHORUS SUBSTANTIALLY ALL IN THE YELLOW OR WHITE FORM IN AN AUTOCLAVE, THE IMPROVEMENT WHICH COMPRISES REACTING SAID REACTANTS AT A TEMPERATURE (T) WITHIN THE RANGE OF FROM ABOUT 275*C. TO ABOUT 400*C. FOR A PERIOD OF TIME (T) OF FROM ABOUT ONE-FOURTH HOUR TO ABOUT 30 HOURS USING A CONCENTRATION OF PHOSPHORUS TRICHLORIDE, PHOSPHORUS, AND CHLOROBENZENE IN AMOUNTS SUFFICIENT TO PROVIDE A MOLAR RATIO (C) OF
Claim 3
Dependent Claim
43 words
The method as recited in claim 1 wherein the temperature is within the range of from about 300*C. to about 350*C., the time is within the range of from about one-half hour to about 14 hours and the molar ratio is about 1.0.
Claim 4
Dependent Claim
13 words
The method as recited in claim 1 wherein Y is at least 70%.
Claim 5
Dependent Claim
13 words
The method as recited in claim 1 wherein Y is at least 80%.
Claim 6
Dependent Claim
11 words
The method as recited in claim 1 wherein the ratio of
Claim 7
Dependent Claim
16 words
The method as recited in claim 5 wherein Rec is between about 0.045 and about 0.13.
Claim 8
Dependent Claim
16 words
The method as recited in claim 1 wherein the confidence limits are + or - 12%.
Claim 9
Dependent Claim
16 words
The method as recited in claim 1 wherein the confidence limits are + or - 6%.
Claim 10
Dependent Claim
17 words
The method as recited in claim 1 wherein temperature (T) is 350*C., time (t) is 2 hours,
Claim 11
Dependent Claim
11 words
The method as recited in claim 1 wherein the ratio of
Claim 12
Dependent Claim
13 words
The method as recited in claim 10 wherein said ratio Z is 0.66.
Claim 13
Dependent Claim
19 words
The method of claim 1 which includes the further step of post-chlorinating the reaction mixture to remove red phosphorus.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |