US3859418A
Expired / Lapsed
US
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Process for the manufacture of phosphorus nitride diamides
Assignee: Knapsack AG
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Filing: 1972-11-29
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Granted: 1975-01-07
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Expires: 1992-11-29
Abstract
Abstract Manufacture of phosphorus nitride diamides. To produce the compounds, white phosphorus or phosphorus trichloride in a polar, inert and alcohol-free solvent having a boiling point lower than 100* C is reacted with chlorine and an excess of gaseous ammonia. The resulting reaction product, which is a mixture of phosphorus nitride diamides and ammonium chloride, is filtered off and the phosphorus nitride diamides are isolated therefrom in conventional manner.
Inventors
- 👤 Hannsjorg Ulrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:14
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/082; C01B21/087; C01B21/092; C01B21/0923
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
24 words
A PROCESS FOR THE MANUFACTURE OF PHOSPHORUS NITRIDE DIAMIDES, WHICH COMPRISES REACTING A STARTING MATERIAL, WHICH IS WHITE PHOSPHORUS OR PHOSPHORUS TRICHLORIDE BEING DISSOLVED
Claim 2
Dependent Claim
24 words
A PROCESS FOR THE MANUFACTURE OF PHOSPHORUS NITRIDE DIAMIDES, WHICH COMPRISES REACTING A STARTING MATERIAL, WHICH IS WHITE PHOSPHORUS OR PHOSPHORUS TRICHLORIDE BEING DISSOLVED
Claim 3
Dependent Claim
63 words
The process as claimed in claim 1, wherein an excess of chlorine is introduced into the said solution or suspension of phosphorus or phosphorus trichloride, the resulting mixture is cooled down to temperatures between -10* and +20* C, gaseous ammonia is introduced into the cooled reaction mixture until the gases issuing therefrom show an alkaline reaction, and precipitated reaction product is filtered off.
Claim 4
Dependent Claim
38 words
The process as claimed in claim 1, wherein the starting material is white phosphorus and wherein the introduction of gaseous ammonia is started following the consumption of a three-fifths portion of the stoichiometric quantity of chlorine, while cooling.
Claim 5
Dependent Claim
30 words
The process as claimed in claim 1, wherein the starting material is phosphorus trichloride and wherein the stoichiometric quantity of chlorine is introduced thereinto together with gaseous ammonia, while cooling.
Claim 6
Dependent Claim
27 words
The process as claimed in claim 1, wherein, following complete introduction of gaseous ammonia, the reaction product is reflux-boiled for a period between 0.5 and 2 hours.
Claim 7
Dependent Claim
23 words
The process as claimed in claim 5, wherein the reaction product is reflux-boiled in the presence of a slight stream of gaseous ammonia.
Claim 8
Dependent Claim
18 words
The process as claimed in claim 1, wherein the ammonia is introduced at temperatures lower than 10* C.
Claim 9
Dependent Claim
14 words
The process as claimed in claim 1, wherein the solvent is a halogenated hydrocarbon.
Claim 10
Dependent Claim
15 words
The process as claimed in claim 8, wherein the solvent is chloroform or methylene chloride.
Claim 11
Dependent Claim
28 words
The process as claimed in claim 1, wherein, following filtration of the reaction product, the solvent is recycled and used again, without subjecting it to any purifying treatment.
References Cited (Backward Citations)
US2980506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |