Removal of carbon dioxide from gas streams
First Claim
Patent Images
1. A method of removing carbon dioxide from a gas stream selected from oxygen, nitrogen, argon and mixtures of these which contains carbon dioxide at a partial pressure not greater than about 10 mbar as an impurity, comprising subjecting said gas stream to adsorption using clinoptilolite as the adsorbent at a temperature in the range of about 20°
- to about 80°
C., thereby adsorbing substantially all of the carbon dioxide from the gas stream.
1 Assignment
0 Petitions
Accused Products
Abstract
Carbon dioxide is removed from a gas stream by passing the gas stream through a bed of natural or synthetic clinoptilolite or their chemically-modified derivatives. The process is particularly advantageous when applied to the removal of ppm levels of carbon dioxide from gas streams at temperatures above 20° C.
-
Citations
13 Claims
-
1. A method of removing carbon dioxide from a gas stream selected from oxygen, nitrogen, argon and mixtures of these which contains carbon dioxide at a partial pressure not greater than about 10 mbar as an impurity, comprising subjecting said gas stream to adsorption using clinoptilolite as the adsorbent at a temperature in the range of about 20°
- to about 80°
C., thereby adsorbing substantially all of the carbon dioxide from the gas stream. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- to about 80°
-
8. A method of separating air comprising the steps:
-
(a) prepurifying air containing carbon dioxide at a partial pressure not greater than about 10 mbar by subjecting the air to a temperature swing adsorption process comprising an adsorption step carried out at a temperature in the range of about 20°
to about 80°
C. and an adsorbent regeneration step using clinoptilolite as adsorbent, thereby adsorbing substantially all of the carbon dioxide from the air; and(b) subjecting the prepurified air to cryogenic distillation, thereby producing high purity nitrogen, high purity oxygen or both of these. - View Dependent Claims (9, 10, 11, 12, 13)
-
Specification