Patent US3681843A successfully refreshed from Google Patents.
Patent US3711592A successfully refreshed from Google Patents.
US3711592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for separation of tungsten chloride from a mixture of metal chlorides
Assignee: Individual
•
Filing: 1971-05-17
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Granted: 1973-01-16
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Expires: 1991-05-17
Abstract
Abstract Tungsten hexachloride is separated from a mixture of metal chlorides comprising tungsten pentachloride and other metal chlorides by first distilling the mixture so as to remove lower boiling chlorides than tungsten pentachloride. The mixture is then chlorinated, preferably at a temperature around that of the boiling point of the tungsten pentachloride. Generally the chlorination will be continued as the temperature of the mixture is increased to about the boiling point of tungsten hexachloride. The chlorination is continued until essentially all of the pentachloride has been converted to hexachloride. The hexachloride may be distilled from higher boiling chlorides if they are present in the mixture to thereby obtain a high purity product which can be converted to tungsten metal by reduction.
Inventors
- 👤 K Jonsson
- 👤 E Svanstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:10
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/30; C22B34/36; C01; C01G; C01G41/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
44 words
A method as claimed in claim 1 in which the mixture of molten metal chlorides also comprises metal chlorides having a lower boiling point than that of tungsten pentachloride and these lower boiling chlorides are distilled from the mixture prior to adding the chlorine.
Claim 2
Dependent Claim
19 words
A method as clAimed in claim 1 in which the chlorine is added into the mixture of molten chlorides.
Claim 3
Dependent Claim
20 words
A method as claimed in claim 1 in which the chlorine is added above the mixture of molten metal chlorides.
Claim 4
Dependent Claim
35 words
A method as claimed in claim 1 in which the mixture further comprises chlorides having a higher boiling point than that of tungsten hexachloride and the tungsten hexachloride is distilled from these higher boiling chlorides.
Claim 5
Dependent Claim
27 words
A method as claimed in claim 1 in which the chlorine addition is continued until the temperature is increased to about the boiling point of tungsten hexachloride.
Claim 6
Independent Claim
70 words
A method for the production of tungsten hexachloride from a mixture of molten metal chlorides comprising tungsten pentachloride in a distillation apparatus which comprises heating the mixture in the distillation apparatus, adding chlorine to the mixture at about a temperature of 265*C. and continuing the addition of chlorine until all the tungsten pentachloride has been transformed into tungsten hexachloride and recovering tungsten hexachloride from the mixture remaining in the apparatus.
Claim 7
Independent Claim
103 words
A method for the production of tungsten hexachloride from a mixture of molten metal chlorides comprising tungsten pentachloride, chlorides having a lower boiling point than that of tungsten pentachloride, and chlorides with a higher boiling point than that of tungsten pentachloride, in a distillation apparatus which comprises heating the mixture in the distillation apparatus, distilling off metal chlorides having lower boiling points than that of tungsten pentachloride in the presence of chlorine introduced into said apparatus until all tungsten pentachloride has been transformed into tungsten hexachloride and distilling the tungsten hexachloride from existing chlorides having higher boiling points than that of tungsten hexachloride.
Claim 8
Dependent Claim
15 words
The method of claim 8 wherein chlorine is added into the mixture of molten chlorides.
Claim 9
Independent Claim
86 words
A method for the production of tungsten hexachloride from a mixture of molten metal chlorides comprising tungsten pentachloride, and chlorides having a lower boiling point than that of tungsten pentachloride, in a distillation apparatus which comprises heating the mixture in the distillation apparatus, distilling off metal chlorides having lower boiling points than that of tungsten pentachloride in the presence of chlorine introduced into said apparatus until all tungsten pentachloride has been transformed into tungsten hexachloride and recovering tungsten hexachloride from the mixture remaining in the apparatus.
Claim 10
Dependent Claim
15 words
The method of claim 10 wherein chlorine is added into the mixture of molten chlorides.
Claim 11
Independent Claim
93 words
A method for the production of tungsten hexachloride from a mixture of molten metal chlorides comprising tungsten pentachloride in a distillation apparatus which comprises: a. heating the mixture in the distillation apparatus while adding chlorine to the mixture, said addition of chlorine being begun at a temperature of about 265*to 275* C.; b. continuing the addition of chlorine while the temperature is raised above about 275* C. until substantially all the tungsten pentachloride in the mixture is transformed into tungsten hexachloride; and c. separating the metal chlorides from the tungsten hexachloride by distillation.
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |