Air purification process
First Claim
1. A method of removing carbon dioxide from air containing up to 1000 ppm carbon dioxide by a pressure swing adsorption process having an adsorption step and an adsorbent regeneration step, the adsorption step of which comprises passing said gas through a two layer adsorption zone containing a first layer of activated alumina and a second layer comprising dealuminated type Y zeolite having a high capacity for carbon dioxide and a low capacity for nitrogen and oxygen and having a silicon/aluminum atomic ratio of at least about 1.5, thereby producing a substantially carbon dioxide-free gas stream.
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Abstract
Substantially all of the carbon dioxide is removed from a gas containing up to about 1% by volume carbon dioxide by subjecting the gas to a pressure swing adsorption process using a two layer adsorption system, wherein the first layer contains activated alumina and the second layer is a zeolite or a combination of zeolites having a silicon to aluminum atomic ratio of at least 1.5. The process is particularly suitable for removing substantially all carbon dioxide and water vapor contained in air prior to subjecting the air to cryogenic distillation.
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Citations
10 Claims
- 1. A method of removing carbon dioxide from air containing up to 1000 ppm carbon dioxide by a pressure swing adsorption process having an adsorption step and an adsorbent regeneration step, the adsorption step of which comprises passing said gas through a two layer adsorption zone containing a first layer of activated alumina and a second layer comprising dealuminated type Y zeolite having a high capacity for carbon dioxide and a low capacity for nitrogen and oxygen and having a silicon/aluminum atomic ratio of at least about 1.5, thereby producing a substantially carbon dioxide-free gas stream.
Specification