US3888971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of hypophosphites
Assignee: Hoechst AG
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Filing: 1972-05-22
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Granted: 1975-06-10
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Expires: 1992-05-22
Abstract
Abstract Hypophosphites are made by the reaction of yellow phosphorus with hydroxides and/or carbonates of alkali metals and/or alkaline earth metals in the presence of water and organic solvents. To this end, the reaction is carried out with the use of solvents, which combine the property of dissolving phosphorus with immiscibility or substantial immiscibility with water and are liquid at the reaction temperature and, following completion of the reaction, the resulting aqueous phase having the hypophosphites therein is separated from the resulting nonaqueous phase, and the hypophosphites are isolated from the aqueous phase in conventional manner.
Inventors
- 👤 Wolfgang Scheibitz
- 👤 Horst Staendeke
- 👤 Siegfried Burkhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:08
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
121 words
A PROCESS FOR THE MANFUACTURE OF HYPOPHOSPHITES BY THE REACTION OF YELLOW PHOSPHORUS AT A TEMPERATURE OF ABOUT 40*C -90*C WITH HYDROXIDES OF ALKALI METALS, CARBONATES OF ALKALI METALS, HYDROXIDES OF ALKALINE EARTH METALS, CARBONATES OF ALKALINE EARTH METALS, OR MIXTURES THEREOF IN THE PRESENCE OF WATER AND ORGANIC SOLVENTS SELECTED FROM THE GROUP CONSISTING OF HYDROCARBON, SHALOGENATED HYDROCARBON, ALCOHOLS OF MORE THAN 5 CARBON ATOMS OR AMINES OF MORE THAN 10 CARBON ATOMS, WHICH COMBINE THE PROPERTY OF DISSOLVING PHOSPHORUS WITH IMMISCIBILITY OR LIMITED MISCIBILITY WITH WATER AND ARE LIQUID AT THE REACTION TEMPERATURE AND, FOLLOWING COMPLETION OF THE REACTION, SEPARATING WITH A SEPARATOR FROM THE RESULTING NONAQUEOUS PHASE OF THE ORGANIC SOLVENTS THE RESULTING AQUEOUS PHASE HAVING HYDROPHOSPHITES THEREIN.
Claim 2
Dependent Claim
121 words
A PROCESS FOR THE MANFUACTURE OF HYPOPHOSPHITES BY THE REACTION OF YELLOW PHOSPHORUS AT A TEMPERATURE OF ABOUT 40*C -90*C WITH HYDROXIDES OF ALKALI METALS, CARBONATES OF ALKALI METALS, HYDROXIDES OF ALKALINE EARTH METALS, CARBONATES OF ALKALINE EARTH METALS, OR MIXTURES THEREOF IN THE PRESENCE OF WATER AND ORGANIC SOLVENTS SELECTED FROM THE GROUP CONSISTING OF HYDROCARBON, SHALOGENATED HYDROCARBON, ALCOHOLS OF MORE THAN 5 CARBON ATOMS OR AMINES OF MORE THAN 10 CARBON ATOMS, WHICH COMBINE THE PROPERTY OF DISSOLVING PHOSPHORUS WITH IMMISCIBILITY OR LIMITED MISCIBILITY WITH WATER AND ARE LIQUID AT THE REACTION TEMPERATURE AND, FOLLOWING COMPLETION OF THE REACTION, SEPARATING WITH A SEPARATOR FROM THE RESULTING NONAQUEOUS PHASE OF THE ORGANIC SOLVENTS THE RESULTING AQUEOUS PHASE HAVING HYDROPHOSPHITES THEREIN.
Claim 3
Dependent Claim
18 words
The process as claimed in claim 1, wherein the organic solvent is paraffin, tetrachloroethylene, tributylamine or hexyl alcohol.
Claim 4
Dependent Claim
36 words
The process as claimed in claim 1, wherein the organic solvents are used in a proportion between 3 and 20 weight percent, based on the quantity of solvent needed to dissolve the whole quantity of phosphorus.
Claim 5
Dependent Claim
35 words
The process as claimed in claim 3, wherein the organic solvents are used in a proportion of substantially 10 weight percent, based on the quantity of solvent needed to dissolve the whole quantity of phosphorus.
Claim 6
Dependent Claim
17 words
The process as claimed in claim 1, wherein the reaction is effected within 20 to 50 minutes.
Claim 7
Dependent Claim
22 words
The process as claimed in claim 1, wherein the non-aqueous phase as thus separated is used as is for making further batches.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |