Core-in-shell composite adsorbent for use in PSA prepurifiers
AssigneePraxair Technology, Inc.
InventorsJian Zheng, Neil A. Stephenson, Steven J. Pontonio, Christopher D. Schotz, Philip A. Barrett
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Abstract
The present invention relates generally to an attrition resistant core-in-shell composite adsorbent comprising at least a zeolite-containing CO2 removal adsorbent and a binder on an inert dense core. The attrition resistant core-in-shell composite adsorbent has an attrition loss of less than about 2 wt %. The core-in-shell composite adsorbent is preferably used in a multi-layered adsorption system in a cyclic adsorption process, preferably used in a PSA prepurification process prior to cryogenic air separation.
Claims18
A multi-layered PSA adsorption system for purifying a gaseous feed containing less than about 5% CO2 in a cyclic adsorption process, wherein said system comprises two or more adsorbent layers wherein the first layer comprises a water and/or water vapor removing adsorbent and the second layer comprises a CO2 removing adsorbent, wherein said CO2 removing adsorbent is a core-in-shell composite adsorbent comprising an inert dense core, and an adsorptive shell, wherein said adsorptive shell comprises at least one zeolite-containing CO2 removal adsorbent and a binder, wherein the core to bead diameter ratio of said composite adsorbent ranges from about 50% to about 90% and wherein said binding agent comprises greater than about 10 wt % of the adsorptive shell material, wherein the attrition loss of said core-in-shell composite adsorbent is less than about 2 wt %, and wherein volumetric performance of said adsorbent is greater than or equal to 0.70 BSF (m3/s.m2).
A core-in-shell composite adsorbent for use in purifying a process gas stream containing less than about 5% CO2 in an adsorption process, said composite comprising an adsorptive shell on an inert dense core, wherein said adsorptive shell comprises a zeolite-containing CO2 removal adsorbent and a clay binding agent wherein the clay binder constitutes greater than about 10 wt % of the adsorptive shell and the core to bead diameter ratio ranges from about 50% to about 90%, wherein the attrition loss of said core-in-shell composite adsorbent is less than about 2 wt %, and wherein volumetric performance of said adsorbent is greater than or equal to 0.70 BSF (m3/s.m2).
A cyclic gas adsorption process for removing at least CO2 from a gas stream having less than 5% CO2, the process comprising contacting the gas stream with a multilayer adsorption system comprising two or more adsorbent layers wherein the first adsorbent layer comprises at least a water and/or water vapor removing adsorbent and the second adsorbent layer comprises a core-in-shell composite adsorbent comprising at least a zeolite-containing CO2 removal adsorbent shell on an inert dense core, wherein the core to bead diameter ratio ranges from about 50% to about 90%, wherein the attrition loss of said core-in-shell composite adsorbent is less than 2 wt %, wherein volumetric performance of said adsorbent is greater than or equal to 0.70 BSF (m3/s.m2), and recovering the CO2 depleted gas stream.
Dependencies are inferred from the claim text.