US4780292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of colorless N-(dichlorophosphoryl)trichlorophosphazene
Assignee: Arkema France SA
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Filing: 1987-11-12
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Granted: 1988-10-25
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Expires: 2007-11-12
Abstract
Abstract Colorless, or but very faintly tinted N-(dichlorophosphoryl)trichlorophosphazene [P 2 NOCl 5 ] is prepared by reacting phosphorus pentachloride with ammonium chloride in the presence of POCl 3 , and then treating the resulting medium of reaction, containing P 3 NCl 12 , with SO 2 , and wherein the temperature of the medium of reaction is maintained at a value of at most about 30° C.
Inventors
- 👤 Nadine Passimourt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:27
CPC Classifications
C; C08; C08G; C08G79/00; C08G79/02; C08G79/025; C01; C01B; C01B21/00; C01B21/082; C01B21/097
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
73 words
A process for the preparation of N-(dichlorophosphoryl)trichlorophosphazene [P 2 NOCl 5 ], comprising (i) reacting phosphorus pentachloride with ammonium chloride in the presence of POCl 3 , (ii) next treating the resulting medium of reaction, containing P 3 NCl 12 , with SO 2 , said medium of reaction being maintained at a temperature of at most about 30° C., and (iii) recovering the P 2 NOCl 5 from said medium of reaction.
Claim 2
Dependent Claim
73 words
A process for the preparation of N-(dichlorophosphoryl)trichlorophosphazene [P 2 NOCl 5 ], comprising (i) reacting phosphorus pentachloride with ammonium chloride in the presence of POCl 3 , (ii) next treating the resulting medium of reaction, containing P 3 NCl 12 , with SO 2 , said medium of reaction being maintained at a temperature of at most about 30° C., and (iii) recovering the P 2 NOCl 5 from said medium of reaction.
Claim 3
Dependent Claim
19 words
The process as defined by claim 1, wherein the mole ratio PCl 5 /NH 4 Cl is about 3:1.
Claim 4
Dependent Claim
28 words
The process as defined by claim 1, wherein the NH 4 Cl is employed in an up to 20% stoichometric excess with respect to said PCl 5 .
Claim 5
Dependent Claim
33 words
The process as defined by claim 1, wherein the amount of POCl 3 by weight constitutes from 0 5 to 5 times the amount by Weight of PCl 5 +NH 4 Cl .
Claim 6
Dependent Claim
32 words
The process as defined by claim 4, wherein the amount of POCl 3 by weight constitutes from 0.8 to 2 times the amount by weight of PCl 5 +NH 4 Cl .
Claim 7
Dependent Claim
28 words
The process as defined by claim 1, wherein the amount of SO 2 employed is such that the mole ratio SO 2 /PCl 5 is at least 2:3.
Claim 8
Dependent Claim
19 words
The process as defined by claim 5, wherein the mole ratio SO 2 /PCl 5 does ot exceed 1.5:1.
Claim 9
Dependent Claim
39 words
The process as defined by claim 1, wherein the temperature of the medium of reaction into which the SO 2 is introduced is maintained at a temperature from the melting point of the reaction medium to approximately 30° C.
References Cited (Backward Citations)
CA572951A
Cited
CA580958A
Cited
CA724556A
Cited
CA730618A
Cited
US2925320A
Cited
US3231327A
Cited
DE2117055A1
Cited
GB1321102A
Cited
US4377558A
Cited
US4544536A
Cited
US4522798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |