Hi Eric Would love to see some more comments on this list on this subject There is quite a bit on the net if you search but a lot of the information seems to be contradictory. One article says only 100% Sulphuric Acid will work. and less than 50% there is no reaction. Another says concentrated sulphuric is a weak acid and dilute sulphuric is a strong acid and 1% to 7% works best for lignin. and that a more concentrated acid will stop the glucose formation.
Some little snips 1. First, the biomass is collected, dried, and milled to pass through a 4 mesh screen. Then the material is transferred to a first stage hydrolyser or large vat. Sulfuric acid (7.65% by weight) is added to the vat which is heated to 100¡ C for 2 hours. ( The Tennessee Valley Authority) 2. Acid Hydrolysis. Acid hydrolysis normally occurs in two stages. During the first stage, weak acids break the hemicellulose into its sugar components. A more severe second stage uses strong acid treatment for hydrolyzing the cellulose component of the feedstock to glucose' a six-carbon sugar. Easter and Goldstein (1992) 3. Next, pour what chemists refer to as 18 Molar H2SO4, sulfuric acid, over the sawdust. The commercial designation, if you order it from a chemical supply house, would be 100% sulfuric acid. However, as low as 91% will work. We tried 9.2 Molar, or 51%, in the lab and it simply didn't work. It just sat there and looked at us. by Mike Brown I'm confused but still reading. and I know that 27% from a battery will work on cotton and got the holes in my jeans to prove it.! >Date: Sat, 04 Nov 2000 01:59:12 -0000 > From: "Eric Deaver" <[EMAIL PROTECTED]> >Subject: Cellulose Conversion >OK, I have read the part of the ethanol manual on cellulose >conversion. Can someone point me in the direction of more detail on >the processes used in converting cellulose (with low lignin content) >to glucose? Any help would be appreciated. -------------------------- eGroups Sponsor -------------------------~-~> Create your business web site your way now at Bigstep.com. It's the fast, easy way to get online, to promote your business, and to sell your products and services. Try Bigstep.com now. http://click.egroups.com/1/9183/2/_/837408/_/973350145/ ---------------------------------------------------------------------_-> Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html To unsubscribe, send an email to: [EMAIL PROTECTED]
