Stable isotope concentration method
US12151208B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 2021 |
| Grant date | Nov 26, 2024 |
| Priority date | — |
| Expiry date | Aug 18, 2041 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25J2220/90
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The object of the present invention is to provide a stable isotope concentration method that reduces equipment cost and power without prolonging the start-up time and enables efficient concentration, and the present invention provides a stable isotope concentration method using multiple cascaded distillation columns (1st column to mth column; m is an integer of 2 or more), wherein the method includes a step in which one of gas and liquid is supplied from a position in the vicinity of the bottom of a (n−1)th column to a position in the vicinity of the top of an nth column (1<n≤m), and the other of liquid and gas is returned from a position in the vicinity of the top of the nth column to a position in the vicinity of the bottom of the (n−1)th column; and wherein in each distillation column, when a flow rate of an ascending gas in the column is a first flow rate and a flow rate of the gas or the liquid supplied from a previous column or a next column is a second flow rate, the second flow rate is 4% by volume or more with respect to the first flow rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.