I must not have gotten enough sleep last night (3 hours) as my first thought when i saw this thread was "what, did he have another flood?". Steve's going back to sleep soon.......
Steve Spence Subscribe to the Renewable Energy Newsletter: http://www.webconx.com/subscribe.htm Renewable Energy Pages - http://www.webconx.com Palm Pilot Pages - http://www.webconx.com/palm X10 Home Automation - http://www.webconx.com/x10 [EMAIL PROTECTED] (212) 894-3704 x3154 - voicemail/fax We do not inherit the earth from our ancestors, we borrow it from our children. -- ----- Original Message ----- From: "Paul Gobert" <[EMAIL PROTECTED]> To: <biofuel@yahoogroups.com> Sent: Wednesday, July 18, 2001 7:33 PM Subject: Re: [biofuel] drying naoh > > > ----- Original Message ----- > > From: "Dick Carlstein" <[EMAIL PROTECTED]> > > > how to dry naoh, > > Dick, a few quotes from text books and some of my own ramblings. > > "Sodium hydroxide, exposed to air, absorbs moisture and forms a > solution.(deliquescent). > It also absorbs carbon dioxide and, on longer exposure, the solution dries > to a white > powder which is sodium carbonate, Na2CO3.H2O. On prolonged exposure, > powdered > sodium hydrogen carbonate NaHCO3 is formed. > NaOH solutions should be protected from air to avoid formation of carbonate. > Carbonate free NaOH solutions for chemical analysis are prepared by weighing > out an > excess of the reagent and rinsing it with distilled water. This removes any > carbonate from > the surface. The NaOH is then dissolved in distilled water and standardised. > Prepare a concentrated solution,( 100g NaOH dissolved in 90ml of water), > cover and > allow to stand, the carbonate remains insoluble." > Have found a conc solution very convenient to prepare methoxide, small > ammount of > water does not adversly effect reaction. 100g NaOH dissolves in 90ml H2O to > give > 130ml of conc solution. Multiply grams of NaOH required by 1.3 to give mls > of conc > NaOH solution to be used. > "Adding lime Ca(OH)2, precipitates the bicarbonates and carbonates. > Industrial Preparation. > Either by Electrolytic Process or by Ammonia-Soda Process. > Solution of NaOH concentrated,filtered, evaporated to dryness and cooled to > flakes of > solid caustic soda." > > Hope this is of help, > Paul > > > Biofuel at Journey to Forever: > http://journeytoforever.org/biofuel.html > Please do NOT send "unsubscribe" messages to the list address. > To unsubscribe, send an email to: > [EMAIL PROTECTED] > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ > > > Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Please do NOT send "unsubscribe" messages to the list address. To unsubscribe, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
