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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>Dr. Dr. Karve,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>Sieves (membranes mostly) have been around a pretty long time. Usually they provide 99.9% N2. I used them to provide an “inert” blanket for a chemical reaction. Most liquid gas suppliers (Airgas; Air Liquide; etc.) will put a system in for you. If you had a need for the N2, then the “waste product” O2 and Ar and other trace elements would come free. But these membranes don’t operate spontaneously. They require a differential pressure. Producing this may eat-up all of your gains!<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>Best, Mark<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> gasification-bounces@lists.bioenergylists.org [mailto:gasification-bounces@lists.bioenergylists.org] <b>On Behalf Of </b>Anand Karve<br><b>Sent:</b> Saturday, March 17, 2012 9:52 PM<br><b>To:</b> Discussion of biomass cooking stoves; Discussion of biomass pyrolysis and gasification<br><b>Subject:</b> [Gasification] Exclusion of nitrogen from air<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>Dear workers of stoves and gasifiers,<o:p></o:p></p></div><div><p class=MsoNormal>when one uses atmospheric air as a source of oxygen, one unnecessarily heats up the nitrogen in the air. This nitrogen ultimately goes out of the chimney, taking with it a lot of heat. The technologies based on wood as fuel are pretty old, but one can revive them, using some of the more recent techniques. A person who owns a foundry told me that a moleular sieve was now available for separating nitrogen from oxygen. Has anybody heard of it? Can it be used in producing a better stove and a better gasifier?<o:p></o:p></p></div><div><p class=MsoNormal>Yours<o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>A.D.Karve <br clear=all><br>-- <br>***<br>Dr. A.D. Karve<br>Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)<br><br><o:p></o:p></p></div></div></body></html>