Browse Prior Art Database

Ball Milling to Obtain K2CO3 Activated Alumina for CO2 Removal Disclosure Number: IPCOM000235723D
Publication Date: 2014-Mar-24
Document File: 1 page(s) / 17K

Publishing Venue

The Prior Art Database

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Ball milling to obtain K2CO3 activated alumina for CO2 removal

Alkali carbonate activated aluminas are used to remove water and carbon dioxide from the air feed to a cryogenic air separation plant.  High energy ball milling provides an alternative to other, well established techniques for preparation of these adsorbents.

The utility of the ball milling method was demonstrated using a laboratory scale Fritsch planetary micro mill.  Solids were milled in a 45 cc stainless steel vessel containing stainless steel milling balls.  Alumina powder and various loadings (0-40 weight %) of potassium carbonate (K2CO3) were milled under a range of conditions.  Resulting compositions were characterized by thermogravimetric analysis (TGA) to determine CO2 adsorption properties.  CO2 uptake capacities were obtained using a 1% CO2 in N2 feed at 40°C after regeneration under a N2 purge at 150°C, both for 60 min dwell times. 

Surprisingly, it was found that ball milling in the presence of water or, preferably, water and high pressure CO2resulted in improved CO2 capacities (Figure 1). 

Figure 1.  CO2 capacities of K2CO3/AA100 samples ball milled under the indicated conditions (normalized to capacity of sample milled in air).  K2CO3 loading was constant for each sample.