Photochemical method for chlorine isotopic enrichment
US4025406A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 28, 1976 |
| Grant date | May 24, 1977 |
| Priority date | — |
| Expiry date | Jan 28, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D59/34
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An isotopic starting material consisting of a mixture of chlorine-35 and chlorine-37 isotopic species of an isotopic compound having the formula CYClX, wherein Y is O or S and X is Cl or F, such as thiophosgene, is selectively isotopically enriched by means of a laser-induced photochemical reaction between selected chlorine isotopic species in the starting material and a dialkoxyethylene, such as diethoxyethylene. The method is carried out by irradiating with laser radiation, a gaseous mixture at a reduced pressure of the isotopic starting material and the dialkoxyethylene, until a stable reaction product is formed. The wavelength of the radiation is selected so as to selectively excite at least one but less than all of the chlorine isotopic species in the starting material, thereby causing the excited species to preferentially react with the dialkoxyethylene. The resulting reaction product is readily separable from the reaction mixture thereby leaving unreacted isotopic starting material selectively enriched in the unexcited chlorine isotopic species.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.