Michael, Beat's the bejeebers out of anyone here as to what a crystalline structure capable of scratching glass would be at the bottom of a wash tank. You don't have any dishonest cousins in the diamond business do you?
We've used wash waters that swing 1.0 + or - either way of neutral, inclusive of shallow well water, creek water, brackish water (sulfonated) city water and distilled, and such has never happened here. And were it a waxy crystalline structure, there would be no scratch potential. Mineral deposits could leave the appearance or feel of scratched glass, but can easily be removed using a mild HCl acid solution. Todd Swearingen ----- Original Message ----- From: Michael Allen <[EMAIL PROTECTED]> To: <biofuels-biz@yahoogroups.com> Sent: Tuesday, September 03, 2002 5:24 AM Subject: Re: [biofuels-biz] some clarification? > Dear Paddy, > > >"It's great to get some input from a knowledgable > > person such as Michael Allen" > > Thanks for the ego massage Paddy but it's even greater > to have some input from someone with the knowledge AND > EXPERIENCE that Todd has! I think that this > demonstrates the real value of the biofuels-biz group. > > And thanks Todd . . . . . Now about these very hard > whitish crystals I get at the bottom of the wash-tank > sometimes . . . . they seem to scratch even glass . . > . . . could they be . . . . ???? :-) > > > --- Appal Energy <[EMAIL PROTECTED]> wrote: > > Dear Mr. or Ms. Goat, > > > > The contents of the middle layer to which you refer > > are largely > > dependant upon the degree of reaction completion, > > the reaction > > type (acid/base or base) and the processing steps > > used > > (principally in an acid/base). > > > > The belief that this layer is primarily soap is > > largely in error, > > as soap is soluble in water. However soap does > > emulsify oily > > substances. The white layer you refer to is largely > > an > > emulsification. The extent of the emulsification is > > greatly > > dependent upon how well the initial reaction was > > conducted. > > Incomplete reactions when blended in 50/50 ratios > > with water in > > 55 gallon lots can result in literally as much as > > several feet in > > depth of emulsification. A complete reaction should > > yield no more > > than a fraction of an inch of an emulsion layer. > > > > The three layers yielded from a catalyst recovery > > attempt are > > from bottom to top: A) neutralized catalyst in > > precipitate form. > > B) crude glycerin (but not quite so crude as > > previously) > > consisting of glycerin, water, discolorants and > > perhaps excess > > acid. C) recovered free fatty acids (soaps that have > > been broken > > down by the acid to FFAs) with perhaps a fraction of > > soluble > > alkyl esters. > > > > The small alkyl ester fraction will be largely > > dependant upon > > your previous separation technique (how much > > biodiesel is > > imported into the FFA recovery process) and to what > > degree the > > FFA recovery process is acidified. > > > > As the ester fraction should be small to > > "non-existant," it is > > almost of no consequence to know that alkyl esters > > in either an > > acid or base environement are continually reverting > > between FFA > > and ester throughout an equilibrium reaction. > > Chances are that a > > FFA recovery step will be acidified in slight excess > > and all or > > almost all esters that existed at the beginning of > > the process > > will be non-existant by its end, having reverted to > > FFAs. > > > > Todd Swearingen > > > > ----- Original Message ----- > > From: goat industries > > <[EMAIL PROTECTED]> > > To: <biofuels-biz@yahoogroups.com> > > Sent: Monday, September 02, 2002 2:40 PM > > Subject: [biofuels-biz] some clarification? > > > > > > > It's great to get some input from a knowledgable > > person such as > > Michael > > > Allen - Michael, could you do us a favour and tell > > us: > > > a) what is the major component of the 'creamy' > > middle layer in > > the post wash > > > methyl ester/water mixture that is commonly called > > soap? > > > b) what are the three layers that are formed when > > crude, black, > > glycerine is > > > neutralised with acid? > > > Your help would be greatly appreciated! > > > > > > > > > > > > ------------------------ Yahoo! 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