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An air prepurification process which includes, as a first step, a pressure swing adsorption process in which the air is passed through a bed of adsorbent which contains activated alumina, thereby effecting removal of substantially all moisture and most carbon dioxide from the feed air and as a secon

An air prepurification process which includes, as a first step, a pressure swing adsorption process in which the air is passed through a bed of adsorbent which contains activated alumina, thereby effecting removal of substantially all moisture and most carbon dioxide from the feed air and as a second step, a temperature swing adsorption process in which the dried feed air is passed through a bed of carbon dioxide-selective adsorbent, thereby removing substantially all of the carbon dioxide remaining in the feed air. The feed air may be passed through beds of hydrogen oxidation and carbon monoxide oxidation catalysts between the first and second steps to convert any hydrogen and carbon monoxide in the feed air to water vapor and carbon dioxide, respectively, these components being removed from the feed air during the second step. The feed air may be optionally passed through a layer of a hydrocarbon selective adsorbent between the first and second steps to remove hydrocarbons such as ethylene, propylene and propane.

대표청구항 ▼

[ What is claimed is:] [1.] A method of removing water vapor and carbon dioxide from a gas comprising repeatedly performing the steps:(a) subjecting said gas to a cyclic pressure swing adsorption process comprising an adsorption step and an adsorbent regeneration step carried out in a first adsorpti

[ What is claimed is:] [1.] A method of removing water vapor and carbon dioxide from a gas comprising repeatedly performing the steps:(a) subjecting said gas to a cyclic pressure swing adsorption process comprising an adsorption step and an adsorbent regeneration step carried out in a first adsorption zone containing sufficient adsorbent to adsorb at least 75 volume percent of the carbon dioxide contained in the gas, thereby removing substantially all of the water vapor and at least 75 volume percent of the carbon dioxide from said gas; and(b) subjecting the substantially water vapor-free and carbon dioxide depleted nonadsorbed gas to a cyclic temperature swing adsorption process comprising an adsorption step and an adsorbent regeneration step carried out in a second adsorption zone containing a carbon dioxide-selective adsorbent, thereby producing a substantially water vapor- carbon dioxide-free gas stream.