Lagonisa,
> The problem is
> that I have also read that due to the reversibility of the reaction,
The reaction is not exactly reversible. "Reversability" would require the
three glycerides and the glycerol recombining. That doesn't happen. Once the
glycerol is cleaved it is out of the picture.
You're suggesting MeOH recovery at the point where the reaction is complete
and the glycerol has yet to settle out. However, that's not altogether
adisable due to the continual mixing of excess catalyst with the methyl
ester.
If you reduce the volume of alcohol via evaporation at this point there
would be a propensity for some of the ester to fracture ("back crack") into
FFAs and then convert to soap. Mind you that "back cracking" can only occur
up to the point that all the catalyst is consumed in soap making.
If you can monitor the reaction and insure that the balance of catalyst is
infintesimally small beyond what is required to guarantee 100% completion,
erego yielding but a small and controlled amount of extra soap production,
then there might be some merit in extracting the alcohol prior to the
glycerin cocktail settling.
Otherwise? Probably none.
Todd Swearingen
> Hello to all:
>
> I have read some contributions to this group about methanol recovery
> and the different options. I would like to try the recovery before
> separation of bio and glycerol using a condenser that would receive
> the methanol fumes after finishing the reaction. I have a processor
> were I get 75¼C-80¼C as it is pressurized to 0,7 bar. The problem is
> that I have also read that due to the reversibility of the reaction,
> if after finishing my reaction I remove the methanol by reducing the
> pressure and directing the vapours through a condenser, or even I
> apply vacuum after despressurizing to do it faster, I can get a
> reduction of the conversion transforming some biodiesel into oil
> again. My question is: has anyone in this group measured or
> experienced this fact? Is there a real decrease of the yield or
> conversion?
>
> Lagonisa
>
>
>
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