http://books.google.com/books?id=MYCBJIKpC2gC&pg=PA91&lpg=PA91&dq=lithium+hydride+pressure+temperature&source=bl&ots=KoJ1UxzxnA&sig=5Z3XBspYh0Wk8VPnwVfC7N50cws&hl=en&ei=QpotS6_hA4-Qtgf07aWKCQ&sa=X&oi=book_result&ct=result&resnum=4&ved=0CBkQ6AEwAzgK#v=onepage&q=lithium%20hydride%20pressure%20temperature&f=false
I think that this is a good reference to add to your collection. On Sat, Jan 3, 2015 at 2:56 PM, Mark Jurich <[email protected]> wrote: > Hi Jones: > > Without going into all the details, your calculations are in line with > the language-translated Parkhomov information. At the point of estimating > the corrected pressure due to heating, he simply multiplies the 50 > bar/atmosphere pressure by 2, to obtain 100 atmospheres. I’m not sure > where you obtained the 900 °K value for the temperature, but all current > estimates are that the internal temperature for the Parkhomov Cell is no > more than about 1000 °C (probably lower than this), based on where his > thermocouple was located. His plots approach 1300 °C where he was > measuring at... > > ... Crunching through all the possible numbers, I get a top end of > 3425psi using all the “extreme” values. Since the MFMP DogBone has > Stainless Steel extension on it, the volume has now increased and I would > be making a wild guess at the added volume, but I would say 30% more > (perhaps Bob H./MFMP can give us some more accurate estimate)? > > I believe Parkhomov is assuming [virtual] loss/leaking of H2 when > obtaining his factor of 2 pressure increase with temperature (and perhaps > it has something to do with the equilibrium conditions that will be > obtained when the 2LiH <> 2Li + H2 reversible reaction occurs at the > temperatures/pressures involved. But this is all pure speculation on my > part, since there are no remarks that I can find. Please note that > Parkhomov had no way of knowing the actual pressures, since he did not > measure them, as far as I know... > > ... He does refer to “> 850 °C” for the above reversible reaction, but I > believe he obtained this value from the Boiling Point of LiH (850 °C) at > Standard Pressure. Actually LiH starts to decompose before it boils > (according to some literature), so for anyone to mention the Boiling Point > of LiH (as I have just did), is highly questionable. Other sources say > that decomposition occurs from 900 – 1000 °C, with no solid reference > that I can find to back it up... > > ... I have about 5 references here concerning all this, and will try to > post them when I get more time... > > - Mark Jurich > > > *From:* Jones Beene <[email protected]> > *Sent:* Saturday, January 03, 2015 9:40 AM > *To:* [email protected] > *Subject:* [Vo]:Right-on AGP > > > Has anyone determined that the high internal pressure claimed by Parkhomov > is even possible? Did he claim 500 psi? I cannot find the reference today, > but the numbers are probably out there and at first glance – score one for > AGP. > > Btw – in a search of Vortex, it turns out Parkhomov was mention by > Rothwell way back in 2012: Author: Y. Bazhutov … A. Parkhomov et al, Year > of Conference: 2012 Title: “Investigation of Radiation Effects at Loading > Ni, Be and LaNi5 by Hydrogen”. Very appropriate. > > Just in case no one else has done it– here are back of envelope calcs – > rounding off slightly: molar volume of hydrogen gas (assuming ideal gas at > 1 atmosphere of pressure) is 24.5 liters (or dm3/mol) at 300 °K, and the > weight of a mole is two grams, so this gives 12 cc/mg for H2 at one bar and > ambient - or 36 cc/mg at 900 °K elevated temperature. > > The “fuel” of Parkhomov was said to be 1/10 gram of LiAlH4 which is about > 10% by weight hydrogen. This means that the weight of hydrogen, if none > escapes is about 10 milligrams at the start. This means that the expanded > gas would occupy about ~120 cc at STP, if released from the hydride - > correct? > > OK. The interior volume of the reactor appears to be about 2.4 cc. so > cramming 120 cc into 2.4 means that would require about 50-1 ratio... or 50 > bar BUT if the reactor and gas is at 900 °K, then 150 bar or 2,175 pounds > per square inch is possible. So the bottom line is yes, even with slight > diffusion into the alumina and no leaks, 500 psi is not only possible but > on the low side. The important detail is what is the pressure at 10,20,30 > hours and so on? > > Apologies if this has been covered, or is not accurate but a lot of folks > seem to second-guessing AGP, at least on a few points, and there appears to > be no problem on this one. > > As of now, in terms of “trustworthiness” of reported data, based on past > work, openness, and freedom from an agenda which would cause one to fudge > data or salt the ash to be tested - I would give AGP a much higher ranking > than AR. Let’s hope we get isotope data. This reaction is nearing the level > of understanding. > > Jones > > >
