IP Library › Granted Patent US 12,151,208
Granted Patent B2
US 12,151,208 · App. 17/914,971 · Granted Nov 26, 2024

Stable isotope concentration method

Inventors: Takashi Kambe (Tokyo, JP); Takehiro Igarashi (Tokyo, JP); Hitoshi Kihara (Tokyo, JP)
Assignee: TAIYO NIPPON SANSO CORPORATION
B01D59/04F25J3/08F25J2215/50F25J2220/90
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Quick Facts
Patent No.
US 12,151,208
App. No.
17/914,971
Granted
Nov 26, 2024
Kind
B2
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.

Claims (4)

1. 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 at the bottom of a (n−1) th column to a position at the top of an nth column (1<n=m), and when gas is supplied from the (n−1)th column to the nth column, liquid is returned, and when liquid is supplied from the (n−1)th column to the nth column, gas is returned from a position at the top of the nth column to a position at 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.

2. The stable isotope concentration method according to claim 1 , wherein the stable isotope is 18 O.

Assignments (2)
CHANGE OF NAME Recorded May 20, 2026
From: TAIYO NIPPON SANSO CORPORATION
To: NIPPON SANSO CORPORATION
Reel/Frame 075586/0889 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 27, 2022
From: KAMBE, TAKASHI; IGARASHI, TAKEHIRO; KIHARA, HITOSHI
To: TAIYO NIPPON SANSO CORPORATION
Reel/Frame 061228/0120 →
Priority Claims (1)
JP 2020-062432 · Mar 31, 2020 · national
Continuity (1)
Related Publication 20230104429A1 · Apr 6, 2023