초록 ▼

Applicant has developed an improved adsorbent useful in removing contaminants from various air streams. The adsorbent contains a zeolite, an alumina and a metal component. The metal component is present in an amount at least 10 mol-% of the stoichiometric amount of metal (expressed as the oxide) nee

Applicant has developed an improved adsorbent useful in removing contaminants from various air streams. The adsorbent contains a zeolite, an alumina and a metal component. The metal component is present in an amount at least 10 mol-% of the stoichiometric amount of metal (expressed as the oxide) needed to balance the negative charge of the zeolite lattice. In a specific application an adsorbent comprising zeolite X, alumina and sodium is used to purify an air stream in order to remove water, carbon dioxide and other impurities including hydrocarbons.

대표청구항 ▼

1. A process for removing contaminants from air streams comprising contacting the stream with a solid shaped adsorbent, at adsorption conditions to remove at least a portion of at least one contaminant, the adsorbent comprising an alumina component, a zeolite component and a metal component, the met

1. A process for removing contaminants from air streams comprising contacting the stream with a solid shaped adsorbent, at adsorption conditions to remove at least a portion of at least one contaminant, the adsorbent comprising an alumina component, a zeolite component and a metal component, the metal component present in an amount at least 10 mol-% of the stoichiometric amount of metal needed to compensate for the negative lattice expressed as the oxide charge of the zeolite, wherein said adsorbent has been activated by heating at a temperature of from about 275° to about 600° C. for a time of about 5 to about 70 minutes. 2. The process of claim 1 wherein said adsorption is part of a cyclic adsorption process selected from temperature swing adsorption, pressure swing adsorption, vacuum swing adsorption and combinations of these. 3. The process of claim 2 wherein said adsorption is part of a pressure swing adsorption process. 4. The process of claim 1 wherein the adsorption conditions include a temperature of about ambient to about 80° C. and a pressure of about atmospheric to about 100 atm. 5. The process of claim 1 wherein the contaminants comprise at least one contaminant selected from the group consisting of CO2,H2O and H2S, COS, O2and CO. 6. The process of claim 1 wherein the zeolite is selected from the group consisting of zeolite X, zeolite Y, zeolite A and mixtures thereof. 7. The process of claim 1 wherein the metal component is an alkali metal, an alkaline earth metal or a mixture thereof. 8. The process of claim 7 wherein said metal component is selected from the group consisting of sodium, potassium, lithium, rubidium, cesium, calcium, strontium, magnesium, barium, zinc, copper and mixtures thereof. 9. The process of claim 1 wherein the zeolite is present in an amount from about 5 to about 55 wt-% of the adsorbent. 10. The process of claim 1 wherein the metal component is present in an amount from about 0.015 to about 0.08 gram moles of metal as the oxide per 100 g of adsorbent.