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Supercritical Solvents

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From 09/16/2014through 10/11/2012

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Notes

1. “A supercritical fluid is any substance at a temperature and pressure above its critical point, where distinct liquid and gas phases do not exist. It can effuse through solids like a gas, and dissolve materials like a liquid. In addition, close to the critical point, small changes in pressure or temperature result in large changes in density, allowing many properties of a supercritical fluid to be "fine-tuned". Supercritical fluids are suitable as a substitute for organic solvents in a range of industrial and laboratory processes. Carbon dioxide and water are the most commonly used supercritical fluids, being used for decaffeination and power generation, respectively.” (Wikipedia, Supercritical Solvents, 10/11/2012)

2. During high speed manufacturing of disposable absorbent articles, such as diapers, defective products are discarded in landfills losing the costly absorbent particles.  These superabsorbent particles typically are more than 90% of the absorbent cores.  Michnacs, Luckert, and Zetzl recovered the absorbent particles by mixing the rejects with a thermoplastic melt such as styrene butadiene block copolymers, solidifying and extracting the thermoplastics, additives and contaminates with a supercritical carbon dioxide or propane leaving behind active, crosslinked superabsorbent particles.
US Patent 8,766,032 (July 1, 2014), “Recycled Superabsorbent Polymer Particles,” Marion Michnacs. Carsten Luckert, and Carsten Zetzl (The Procter & Gamble Company, Cincinnati, Ohio, USA).

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Interested!!
Bookmark this page to follow future developments!.
(RDC 6/5/2012)

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Roger D. Corneliussen
Editor
www.maropolymeronline.com

Maro Polymer Links
Tel: 610 363 9920
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E-Mail: cornelrd@bee.net  

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Copyright 2012 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen
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* Date of latest addition; date of first entry is10/11/2012.