Patent US4902490A successfully refreshed from Google Patents.
US4902490A
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Essentially pure/colorless P2 NOCl5
Assignee: Arkema France SA
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Filing: 1988-03-10
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Granted: 1990-02-20
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Expires: 2008-03-10
Abstract
Abstract Essentially pure and colorless N-(dichlorophosphoryl)trichlorophosphazene [P 2 NOCl 5 ] is prepared/purified under relatively moderate conditions, by reacting phosphorous pentachloride with ammonium chloride, treating the resulting medium of reaction, containing P 3 NCl 12 , with SO 2 , and thin film evaporating the medium of reaction, advantageously in two stages, to eliminate SO 2 , POCl 3 and SOCl 2 values therefrom.
Inventors
- 👤 Guy Pagniez
- 👤 Philippe Potin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:37
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/082; C01B21/097; C01B25/00; C01B25/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
74 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) treating the resulting medium of reaction, containing P 3 Cl 12 , with SO 2 to obtain P 2 NOCl 5 and SOCl 2 , and (iii) thin film evaporating said medium of reaction to eliminate SO 2 , POCl 3 and SOCl 2 values therefrom.
Claim 2
Dependent Claim
74 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) treating the resulting medium of reaction, containing P 3 Cl 12 , with SO 2 to obtain P 2 NOCl 5 and SOCl 2 , and (iii) thin film evaporating said medium of reaction to eliminate SO 2 , POCl 3 and SOCl 2 values therefrom.
Claim 3
Dependent Claim
34 words
The process as defined by claim 1, comprising conducting said thin film evaporation (iii) in two stages, whereby successively first eliminating residual SO 2 values, and then the SOCl 2 and POCl 3 values.
Claim 4
Dependent Claim
47 words
The process as defined by claim 2, said first stage being carried out at a temperature of from 20° to 80° C., under an absolute pressure of from 5 to 20 torrs and at a flow rate of from 20 to 150 kg.hr -1 m -2 .
Claim 5
Dependent Claim
47 words
The process as defined by claim 3, said second stage being carried out at a temperature of from 100° to 180° C., under an absolute pressure of from 5 to 20 torrs and at a flow rate of from 20 to 150 kg.hr -1 .m -2 .
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-19 | 1993-08-21 | 1994-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-19 | 1997-08-21 | 1998-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-19 | 2001-08-21 | 2002-02-20 | $7700.00 | Window Closed / Lapsed |