Patent US4447303A successfully refreshed from Google Patents.
US4447303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of separating boron isotopes
Assignee: United States, DOE THE, Secretary of
•
Filing: 1981-01-23
•
Granted: 1984-05-08
•
Expires: 2001-01-23
Abstract
Abstract A method of boron isotope enrichment involving the isotope preferential photolysis of (2-chloroethenyl)dichloroborane as the feed material. The photolysis can readily be achieved with CO2 laser radiation and using fluences significantly below those required to dissociate BCl3.
Inventors
- 👤 Reed J. Jensen
- 👤 James M. Thorne
- 👤 Coran L. Cluff
- 👤 John K. Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:20
CPC Classifications
B; B01; B01D; B01D59/00; B01D59/34
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
61 words
A method of enriching boron in a particular isotope thereof which comprises: (a) irradiating gaseous HClC═CHBCl 2 containing both boron isotopes with radiation of a wavelength which at least preferentially excites those molecules containing a particular boron isotope and a fluence sufficient to photodissociate those molecules thus excited, and (b) separating the undissociated HClC═CHBCl 2 from the products of said photodissociation.
Claim 2
Independent Claim
61 words
A method of enriching boron in a particular isotope thereof which comprises: (a) irradiating gaseous HClC═CHBCl 2 containing both boron isotopes with radiation of a wavelength which at least preferentially excites those molecules containing a particular boron isotope and a fluence sufficient to photodissociate those molecules thus excited, and (b) separating the undissociated HClC═CHBCl 2 from the products of said photodissociation.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein said radiation is infrared radiation.
Claim 4
Dependent Claim
19 words
The method of claim 2 wherein said radiation is in the range of 1300 to 800 cm -1 .
Claim 5
Dependent Claim
21 words
The method of claim 3 wherein said radiation is from the P or R branch lines of a CO 2 laser.
Claim 6
Dependent Claim
28 words
The method of claim 1 wherein said fluence is not sufficient to produce any substantial dissociation of BCl 3 produced by the photodissociation of said HClC═CHBCl 2 .
Claim 7
Dependent Claim
49 words
The method of claim 1 wherein the BCl 3 and C 2 H 2 formed by the photodissociation of said HClC═CHBCl 2 are recombined to form HClC═CHBCl 2 enriched in said particular isotope and said enriched HClC═CHBCl 2 is again staged through steps (a) and (b) of claim 1.
Claim 8
Dependent Claim
26 words
The method of claim 1 wherein the undissociated HClC═CHBCl 2 depleted in said particular isotope is again staged through steps (a) and (b) of claim 1.
Claim 9
Dependent Claim
22 words
The method of claim 7 wherein said staging is cascaded until a desired degree of enrichment of said particular isotope is obtained.
Claim 10
Dependent Claim
28 words
The method of claim 8 wherein the BCl 3 formed in the final stage of the cascade is reduced to provide boron metal enriched in said particular isotope.
Claim 11
Dependent Claim
17 words
The method of claim 9 wherein said BCl 3 is reduced by reaction with H 2 .
Claim 12
Dependent Claim
49 words
The method of claim 10 wherein the HCl formed by the reaction of said BCl 3 with H 2 is electrolyzed and the product Cl 2 recycled for use in the synthesis of natural BCl 3 used to form feed HClC═CHBCl 2 containing a natural abundance of boron isotopes.
Claim 13
Dependent Claim
92 words
The method of claim 8 wherein the HClC═CHBCl 2 depleted in said particular isotope which exits the final stage of the cascade is dissociated to form BCl 3 depleted in said particular isotope, said depleted BCl 3 is converted to B 2 O 3 , the Cl 2 formed during said conversion is recycled for use in the synthesis of natural BCl 3 used to form feed HClC═CHBCl 2 containing a natural abundance of boron isotopes, and the B 2 O 3 is reduced to metallic boron depleted in said particular isotope.
References Cited (Backward Citations)
US4088553A
Cited
US4049515A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |