Chemical Processing - April 2008 - (Page 15)

IN PROCESS >> Adsorbent breaks CO2 barrier Amine-modi ed silicas have posed a trade-off between carbon dioxide removal ability and robustness. However, a new variant provides both high capacity and reusability, say researchers at Georgia Tech, Atlanta. The material is produced via a simple one-step process, and its raw materials are relatively inexpensive, adds Christopher Jones, a professor in the School of Chemical and Biomolecular Engineering. The hyperbranched aminosilica (HAS) adsorbs 2 to 3 mmole of CO2/g of adsorbent at temperatures from 25°C to 75°C, the range likely for commercial use. This is up to ve times better than the performance of other amine adsorbents reported in the literature. In laboratory tests in a xed bed, the adsorbent maintained constant performance (within the limits of experimental error) over 12 adsorption/desorption cycles. The material can clean up flue gases but also may be good for capturing CO2 from other sources and for removing SOX, he adds. The key to the material’s performance and robustness is the creation of a covalent chemical bond between branched multiple layer organic adsorbent and the silica support. Other amine-modi ed silicas that rely on physical linkage provide high capacity but can’t be reused. Materials with chemical bonds can be reused but don’t provide as high capacity because they are limited to an amine monolayer. The synthesis approach developed at Georgia Tech yields multiple amine layers with branches on both the surface and within the pores of the silica, and thus provides signi cantly greater capacity to capture CO2. Fine-tuning the ratio of types of binding sites may provide even more capacity, notes Jones. Piloting could begin within a year, he reckons, if the researchers opt to change with a fixed-bed approach. However, such beds might not be optimal for exposing flue gases to the adsorbent on an industrial scale, Jones says. So, it may make sense to develop a better process and test it simultaneously with the adsorbent, although this would delay piloting, he adds. Discussions with potential partners have already started. CP Rental Cooling. For Chemical Process Applications Rental Cooling Emergency Planned Supplemental Turnaround Pilot Plant We keep process lines running at peak capacity. Our engineers speak your technical language and can help you solve your temperature control problem. Chillers Cooling Towers Pumps Heat Exchangers Tanks Air Conditioners Air Handlers Dehumidifiers Heaters Boilers Generators 800-586-8336 We are the rental cooling, heating and dehumidiﬁcation experts. April 2008 • 15 CarrierRentals.com www.chemicalprocessing.com http://www.CarrierRentals.com http://www.CarrierRentals.com http://www.chemicalprocessing.com

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Chemical Processing - April 2008 Contents From the Editor ChemicalProcessing.com Field Notes In Process Energy Saver Compliance Advisor Is It a Tragedy or Comedy for Engineers? Better Understanding Boosts Mixer Scale-up Don't Err With Air Compressors Control Performance Supervision Enhances Revamp Process Puzzler Plant InSites Equipment & Services Product Spotlight/Classifieds Ad Index End Point

Chemical Processing - April 2008

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