Method and apparatus for separating carbon and oxygen isotopes by using optical fiber laser

Patent metadata

Field	Value
Publication number	US-9731269-B2
Application number	US-201214360810-A
Country	US
Kind code	B2
Filing date	Jul 19, 2012
Priority date	Nov 25, 2011
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

Provided is a method of separating carbon and oxygen isotopes by using a laser. In one preferred embodiment, the method includes performing a photolysis process on formaldehyde including a carbon or oxygen isotope by irradiation with ultraviolet light having a wavelength ranging from 340 nm to 360 nm to generate carbon monoxide having a carbon or oxygen isotope enriched therein and hydrogen, performing a catalytic reaction on the carbon monoxide having a carbon or oxygen isotope enriched therein and the hydrogen to synthesize carbon dioxide (CO 2 ) and water (H 2 O) having a carbon or oxygen isotope enriched therein, and cooling the H 2 O to recover CO 2 having a carbon isotope enriched therein or H 2 O having an oxygen isotope enriched therein.

First claim

The invention claimed is:

1. A method of separating a carbon isotope, the method comprising:
performing a first photolysis process on formaldehyde, including a carbon isotope, by irradiation thereof with ultraviolet light having a wavelength ranging from 340 nm to 360 nm to generate carbon monoxide having a carbon isotope enriched therein and hydrogen;
extracting and removing unphotolized formaldehyde and recovering the carbon monoxide having a carbon isotope enriched therein and hydrogen;
performing formaldehyde synthesis for synthesizing formaldehyde having a carbon isotope enriched therein by using the recovered carbon monoxide having a carbon isotope enriched therein and hydrogen, wherein methanol is synthesized from the hydrogen and the carbon monoxide having a carbon isotope enriched therein by a catalytic reaction, and the formaldehyde having a carbon isotope enriched therein is synthesized from the synthesized methanol by a catalytic reaction;
performing a second photolysis process for generating carbon monoxide having a carbon isotope enriched therein and hydrogen through photolysis by irradiating the synthesized formaldehyde having a carbon isotope enriched therein with ultraviolet light having a wavelength range of 340 nm to 360 nm;
performing a catalytic oxidation reaction on the carbon monoxide having a carbon isotope enriched therein and the hydrogen generated by the second photolysis process to synthesize carbon dioxide (CO 2 ) having a carbon isotope enriched therein and water (H 2 O); and
cooling the H 2 O to recover CO 2 having a carbon isotope enriched therein.

2. The method of claim 1 , wherein the photolysis is performed by irradiation with a third harmonic generated by an optical fiber laser.

3. The method of claim 1 , wherein, after infrared light having a wavelength ranging from 1020 nm to 1080 nm is pulse modulated and amplified by an optical fiber amplifier, ultraviolet light having a wavelength ranging from 340 nm to 360 nm is formed by converting the infrared light into a third harmonic.

4. A method of separating an oxygen isotope, the method comprising:
performing a first photolysis process on formaldehyde including an oxygen isotope by irradiation with ultraviolet light having a wavelength ranging from 340 nm to 360 nm to generate carbon monoxide having an oxygen isotope enriched therein and hydrogen;
extracting and removing unphotolized formaldehyde and recovering the carbon monoxide having an oxygen isotope enriched therein and hydrogen;
performing formaldehyde generation for generating formaldehyde having an oxygen isotope enriched therein by using the recovered carbon monoxide having an oxygen isotope enriched therein and hydrogen, wherein methane and water are synthesized from the hydrogen and the carbon monoxide having an oxygen isotope enriched therein by a catalytic methanation reaction, and the formaldehyde having an oxygen isotope enriched therein is generated by mixing the synthesized water with formaldehyde to generate an oxygen-isotope exchange reaction between the water and the formaldehyde;
performing a second photolysis process for generating carbon monoxide having an oxygen isotope enriched therein and hydrogen through photolysis by irradiating the synthesized formaldehyde having an oxygen isotope enriched therein with ultraviolet light having a wavelength range of 340 nm to 360 nm;
performing a catalytic methanation reaction on the carbon monoxide having an oxygen isotope enriched therein and the hydrogen generated by the second photolysis process to synthesize water (H 2 O) and methane (CH 4 ); and
cooling the H 2 O to recover H 2 O having an oxygen isotope enriched therein.

5. The method of claim 4 , wherein the photolysis is performed by irradiation with a third harmonic generated by an optical fiber laser.

6. The method of claim 4 , wherein, after infrared light having a wavelength ranging from 1020 nm to 1080 nm is pulse modulated and amplified by an optical fiber amplifier, the ultraviolet light having a wavelength ranging from 340 nm to 360 nm is formed by converting the infrared light into a third harmonic.

7. The method of claim 1 , wherein the ultraviolet light having a wavelength ranging from 340 nm to 360 nm is generated by an optical fiber laser apparatus comprising:
a main oscillator irradiating a laser having a wavelength range of 1020 nm to 1080 nm;
an intensity modulator modulating a pulse of the laser;
a plurality of ytterbium-doped fiber amplifiers amplifying a power of the pulse modulated laser; and
second and third harmonic generators converting a wavelength of the power amplified laser into an ultraviolet light wavelength ranging from 340 nm to 360 nm.

8. The method of claim 4 , wherein the ultraviolet light having a wavelength ranging from 340 nm to 360 nm is generated by an optical fiber laser apparatus comprising:
a main oscillator irradiating a laser having a wavelength range of 1020 nm to 1080 nm;
an intensity modulator modulating a pulse of the laser;
a plurality of ytterbium-doped fiber amplifiers amplifying a power of the pulse modulated laser; and
second and third harmonic generators converting a wavelength of the power amplified laser into an ultraviolet light wavelength ranging from 340 nm to 360 nm.

Assignees

• Jeong Do-Young
• Park Hyoun-Min
• Cha Yong-Ho
• Chung Dong-Yong
• Korea Atomic Energy Res

Inventors

• Jeong Do-Young
• Park Hyoun-Min
• Cha Yong-Ho
• Chung Dong-Yong

Classifications

• C07C45/78

  Separation; Purification; Stabilisation; Use of additives · CPC title

• B01D59/34 Primary

  Separation by photochemical methods · CPC title

• C01B31/02

  Chemistry & Metallurgy · mapped topic

• B01J19/123 Primary

  Ultraviolet light · CPC title

• C01B13/0237

  by oxidation · CPC title