Todd, is the amount of methanol remaining in the methyl ester
considered negligible? Is it possible to determine what percentage
remains in the methyl ester and what percentage in the glycerol? Maud
>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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