Method of separating and recovering carbon dioxide from combustion exhausted gas and apparatus therefor

• US 6,372,023 B1
• Filed: 07/28/2000
• Issued: 04/16/2002
• Est. Priority Date: 07/29/1999
• Status: Expired due to Fees

• Current Assignee: Fumio Kiyono, National Institute of Advanced Industrial Science and Technology (Government of Japan)
• Original Assignee: Fumio Kiyono, National Institute of Advanced Industrial Science and Technology (Government of Japan)
• Inventors: Saito, Takayuki, Kiyono, Fumio
• Primary Examiner(s): SMITH, DUANE
• Application Number:
  US09/628,648
• Time in Patent Office: 627 Days
• Field of Search: 952/28, 952/29, 952/36, 963/22, 962/66, 626/17, 626/25, 626/32, 423/220, 423/437.R, 422/173, 422/198, 422/202, 422/204
• US Class Current: 95/228
• CPC Class Codes: B01D 53/62 Carbon oxides
• CPC Class Codes: C01B 32/50 Carbon dioxide
• CPC Class Codes: Y02C 20/40 of CO2
• CPC Class Codes: Y02P 20/151 Reduction of greenhouse gas [GHG] emissions, e.g. CO2

Abstract

There is disclosed a method of separating and recovering carbon dioxide from combustion exhausted gas, which method includes: bringing the combustion exhausted gas in contact with water, under a pressure-increased condition, to form carbon dioxide hydrate; and thus separating and recovering carbon dioxide contained in the combustion exhausted gas. According to the method, CO₂ of high purity can be separated and recovered from the combustion exhausted gas at low cost and with low energy consumption. There is also disclosed an apparatus for separation and recovery of CO₂ which apparatus is employed in the method.

Claims

1. A method of separating and recovering carbon dioxide from a combustion exhausted gas, comprising:

bringing the combustion exhausted gas into contact with water, under a pressure-increased condition, to form carbon dioxide hydrate, and thereby separating and recovering carbon dioxide contained in the combustion exhausted gas.

2. The method of separating and recovering carbon dioxide from a combustion exhausted gas as claimed in claim 1, comprising spraying the water as fine particles, to bring the combustion exhausted gas into contact with the water.

3. The method of separating and recovering carbon dioxide from a combustion exhausted gas as claimed in claim 1, comprising bringing the combustion exhausted gas into contact with a carrier carrying the water thereon.

4. The method of separating and recovering carbon dioxide from a combustion exhausted gas as claimed in claim 1, comprising blowing the combustion exhausted gas into the water, to bring the combustion exhausted gas into contact with the water.

5. The method of separating and recovering carbon dioxide from a combustion exhausted gas as claimed in claim 1, wherein the water contains a water-soluble organic compound.

6. An apparatus for separation and recovery of carbon dioxide from a combustion exhausted gas, which comprises:

a reactor that has an inlet of the combustion exhausted gas and an outlet of the combustion exhausted gas from which carbon dioxide is removed, and that is capable of controlling and maintaining the inner pressure and temperature thereof,

wherein, in the reactor, the combustion exhausted gas containing carbon dioxide is brought into contact with water, to precipitate carbon dioxide hydrate, and thereby carbon dioxide contained in the combustion exhausted gas is separated and recovered.

7. The apparatus for separation and recovery of carbon dioxide from a combustion exhausted gas as claimed in claim 6, which comprises:

(A) the reactor having the inlet of the combustion exhausted gas, the outlet of the combustion exhausted gas from which carbon dioxide is removed, and means for spraying water in a form of fine particles inside the reactor;

(B) means for supplying the combustion exhausted gas, which for pressurizes the combustion exhausted gas by compression and supplies the pressurized combustion exhausted gas to the reactor;

(C) means for controlling temperature, which controls and maintains the combustion exhausted gas inside the reactor at a temperature to form carbon dioxide hydrate; and

(D) means for supplying water, which pressurizes water and supplies the pressurized water to the means for spraying water.

8. The apparatus for separation and recovery of carbon dioxide from a combustion exhausted gas as claimed in claim 6, which comprises:

(A) the reactor having the inlet of the combustion exhausted gas, the outlet of the combustion exhausted gas from which carbon dioxide is removed, and a carrier provided in the reactor for carrying water therein;

(B) means for supplying the combustion exhausted gas, which pressurizes the combustion exhausted gas by compression and supplies the pressurized combustion exhausted gas to the reactor; and

(C) means for controlling temperature, which controls and maintains the combustion exhausted gas inside the reactor at a temperature to form carbon dioxide hydrate.

9. The apparatus for separation and recovery of carbon dioxide from a combustion exhausted gas as claimed in claim 6, wherein the water contains a water-soluble organic compound.