Process for adsorbing and separating carbon dioxide from gas mixture

• US 4,726,815 A
• Filed: 12/05/1986
• Issued: 02/23/1988
• Est. Priority Date: 12/10/1985
• Status: Expired due to Term

• Current Assignee: Seitetsu Kagaku Company Limited (Sumitomo Chemical Company Limited), Sumitomo Chemical Company Limited
• Original Assignee: Seitetsu Kagaku Company Limited (Sumitomo Chemical Company Limited), Sumitomo Chemical Company Limited
• Inventors: Hashimoto, Kiyoshi, Kurimoto, Makoto, Uno, Masaru, Kono, Takumi
• Primary Examiner(s): SPITZER, ROBERT H
• Application Number:
  US06/938,240
• Time in Patent Office: 445 Days
• Field of Search: 55/23, 55/25-27, 55/31, 55/33, 55/58, 55/62, 55/68, 55/74, 55/75
• US Class Current: 95/41
• CPC Class Codes: B01D 2253/102 Carbon
• CPC Class Codes: B01D 2256/22 Carbon dioxide
• CPC Class Codes: B01D 2257/80 Water
• CPC Class Codes: B01D 2259/40086 by using a purge gas B01D2259/4009 takes precedence
• CPC Class Codes: B01D 2259/403 using three beds
• CPC Class Codes: B01D 53/04 with stationary adsorbents B01D53/025 takes precedence
• CPC Class Codes: B01D 53/0446 Means for feeding or distributing gases
• CPC Class Codes: B01D 53/047 Pressure swing adsorption
• 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

Carbon dioxide can be obtained in high recovery with high purity from a gas mixture containing 10% or more of carbon dioxide by a pressure-swing adsorption method wherein moisture in the gas mixture is removed with cooling and heating prior to the adsorption of the carbon dioxide on an adsorbent.

Claims

1. A process for adsorbing and separating carbon dioxide from a gas mixture by a pressure-swing adsorption and separation method comprising adsorbing a carbon dioxide component on an adsorbent from a gas mixture having a higher dew point, purging the adsorbent zone with a purge gas, and desorbing the carbon dioxide, characterized in that prior to supplying the gas mixture to the adsorbent moisture in the gas mixture is removed with cooling so as to make the dew point 5°

to 20°

C. under atmospheric pressure, and the gas mixture from which the moisture has been removed by cooling is heated prior to being supplied to the adsorbent.

2. A process according to claim 1, wherein the gas mixture supplied to the moisture removal with cooling is subjected to a pressure of from atmospheric pressure to 1 Kg/cm² G.

3. A process according to claim 1, wherein the moisture-removed gas mixture is heated to the adsorption temperature of carbon dioxide.

4. A process according to claim 1, wherein the moisture-removed gas mixture is heated to a temperature of 5°

to 30°

C. higher than the dew point of the gas mixture at atmospheric pressure.

5. A process according to claim 1, wherein the adsorption is carried out at a pressure of from atmospheric pressure to 1 Kg/cm² G.

6. A process according to claim 1, wherein the desorption is carried out at a pressure of 50 Torr or higher.

7. A process according to claim 1, wherein the purge gas is a portion of desorbed carbon dioxide.

8. A process according to claim 7, wherein the moisture in the purge gas is removed with cooling so as to make the dew point 5°

to 40°

C. under atmospheric pressure.