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Zorn M.E.,University of Wisconsin - Green Bay | Zorn M.E.,Microporous Oxides Science and Technology LLC | Tompkins D.T.,Microporous Oxides Science and Technology LLC | Zeltner W.A.,Microporous Oxides Science and Technology LLC | And 3 more authors.
Industrial and Engineering Chemistry Research | Year: 2012

The use of carbon dioxide (CO 2) in precision cleaning applications requires a high-purity feed stream of CO 2, which can add considerable cost to the overall process. The ability to purchase and clean a lower grade of CO 2 would represent a significant cost savings. In this study, an in-line catalytic purification system was employed to clean two low-purity grades of CO 2 to very low contaminant levels at flow rates relevant for full-scale precision cleaning applications (3.63 kg/h or 8 lb/h). A "food" grade of CO 2 had an unpurified contaminant concentration of 4.0 ng/g, and a "bone dry" grade had an unpurified contaminant concentration of 4.9 ng/g. After catalytic purification, the food grade contaminant concentration was reduced to 0.14 ng/g (a 97% reduction), and the bone dry grade contaminant concentration was reduced to 0.26 ng/g (a 95% reduction). © 2012 American Chemical Society. Source

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