Vážení zkušení esterifikanti....
Moderátoři: šulda, radluk, Moderátoři
nemam to pofotene, pretoze uz to mam ako rutinu, ale presne takto to vyzera u mna.
prefiltrovany pouzity olej z restiky-metylester po ukonceni esterifikacie-hotovy vyprany a ususeny metylester
tento obrazok je stiahnuty z netu
doporucena davka je 20% metanolu, no milos dava 11% a akoby zazrakom ma kristalove mero, a niekedy do hodiny. ja si pockam preistotu do druheho dna, lebo este aj na druhy den je usadena trocha glycerinu. urcite hra rolu aj samotny olej, ja mam len slnecnicovy.
moje pomery 80l olej-15l metanol-500g 99% NaOH
takto to proste u mna funguje.
co sa tyka prania, tak na vypranie 80L esterifikatu pouzijem ca50L vody.
komu neni jasne pranie tak takto to funguje:
http://www.youtube.com/watch?v=qPzV4iwDlrw
kua, zabudol som tam drbnut tie trencle
http://www.youtube.com/watch?v=cntd7F9w ... re=related
prefiltrovany pouzity olej z restiky-metylester po ukonceni esterifikacie-hotovy vyprany a ususeny metylester
tento obrazok je stiahnuty z netu
doporucena davka je 20% metanolu, no milos dava 11% a akoby zazrakom ma kristalove mero, a niekedy do hodiny. ja si pockam preistotu do druheho dna, lebo este aj na druhy den je usadena trocha glycerinu. urcite hra rolu aj samotny olej, ja mam len slnecnicovy.
moje pomery 80l olej-15l metanol-500g 99% NaOH
takto to proste u mna funguje.
co sa tyka prania, tak na vypranie 80L esterifikatu pouzijem ca50L vody.
komu neni jasne pranie tak takto to funguje:
http://www.youtube.com/watch?v=qPzV4iwDlrw
kua, zabudol som tam drbnut tie trencle
http://www.youtube.com/watch?v=cntd7F9w ... re=related
EKOCar B100
#1:Octavia Combi '99 Black magic, AHF, EGRoff, TT-puky, 13000lm light.
#2:Octavia '97, modra metaliza, AGR,EGRoff,MAFoff
#1:Octavia Combi '99 Black magic, AHF, EGRoff, TT-puky, 13000lm light.
#2:Octavia '97, modra metaliza, AGR,EGRoff,MAFoff
- slovacek.milos
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mně se kdysi nepovedla jedna várka taky kalný a sopel vtomplaval no fajrajt tobyl, tak jsem to zkoušel nějak polepšit a přišel jsem na výrobu pudinku,svars píše:Ty první dvě sklínky z leva sedí.... +- ... včera sem ještě zkoušel sušit vypraný eeřo. po zahřátí to bylo supr čiré, žlutozelené..... po vystydnutí to sice čiré zůstalo ale zas se to zdrclo v pudink.. takže sem buď totální matlák nebo to doma z etanolu asi nepude...
za stálehého míchání jsem ho vléval do hajzlu
co vidím já tak esterifikace musí proběhnou správně
esterifikát musí být čistý,
a esterifikaci nelze opakovat,
něco z guglu:
In round numbers the molecular weight of methanol is 32 gm/mole, and for ethanol is 46 gm/mole. The "target" amount of 25% alcohol is good if you are using methanol. The amount must be adjusted up by a factor of about 44% (46/32 = 1.4375 or 44%) when using ethanol.
So 25% x 1.4375 = 36% ethanol. But! this is for pure ethanol. Since your ethanol was denatured to 93%, then you also need to adjust for the denaturant. Again, 36%/0.93 = 38.6%.
You should have used 38.6% denatured ethanol in your reaction.
Now for the catalyst.
I interpreted your value of "0,1%NaOH" to mean "the amount of catalyst I used was equal to 1/10 of 1% of the weight of the rapeseed oil." A single liter of rapeseed oil will weigh about 880 gm/mole. So 1/10 of 1% would equal 0.88 grams of NaOH per liter of oil. This is not nearly enough catalyst to drive the reaction.In this case both the low amount of alcohol and the low amount of catalyst worked against your reaction.
If, instead, the weight of catalyst that you used was equal to 1% of the weight of the oil, then 8.8 grams of catalyst per liter of oil would be about right.
podle toho to vychází +- na 1000g oleje 490ml ethanolu.... , to už je fakt dost...
In round numbers the molecular weight of methanol is 32 gm/mole, and for ethanol is 46 gm/mole. The "target" amount of 25% alcohol is good if you are using methanol. The amount must be adjusted up by a factor of about 44% (46/32 = 1.4375 or 44%) when using ethanol.
So 25% x 1.4375 = 36% ethanol. But! this is for pure ethanol. Since your ethanol was denatured to 93%, then you also need to adjust for the denaturant. Again, 36%/0.93 = 38.6%.
You should have used 38.6% denatured ethanol in your reaction.
Now for the catalyst.
I interpreted your value of "0,1%NaOH" to mean "the amount of catalyst I used was equal to 1/10 of 1% of the weight of the rapeseed oil." A single liter of rapeseed oil will weigh about 880 gm/mole. So 1/10 of 1% would equal 0.88 grams of NaOH per liter of oil. This is not nearly enough catalyst to drive the reaction.In this case both the low amount of alcohol and the low amount of catalyst worked against your reaction.
If, instead, the weight of catalyst that you used was equal to 1% of the weight of the oil, then 8.8 grams of catalyst per liter of oil would be about right.
podle toho to vychází +- na 1000g oleje 490ml ethanolu.... , to už je fakt dost...
Škoda 1.9, 81
mne to vychadzatakto:svars píše:něco z guglu:
In round numbers the molecular weight of methanol is 32 gm/mole, and for ethanol is 46 gm/mole. The "target" amount of 25% alcohol is good if you are using methanol. The amount must be adjusted up by a factor of about 44% (46/32 = 1.4375 or 44%) when using ethanol.
So 25% x 1.4375 = 36% ethanol. But! this is for pure ethanol. Since your ethanol was denatured to 93%, then you also need to adjust for the denaturant. Again, 36%/0.93 = 38.6%.
You should have used 38.6% denatured ethanol in your reaction.
Now for the catalyst.
I interpreted your value of "0,1%NaOH" to mean "the amount of catalyst I used was equal to 1/10 of 1% of the weight of the rapeseed oil." A single liter of rapeseed oil will weigh about 880 gm/mole. So 1/10 of 1% would equal 0.88 grams of NaOH per liter of oil. This is not nearly enough catalyst to drive the reaction.In this case both the low amount of alcohol and the low amount of catalyst worked against your reaction.
If, instead, the weight of catalyst that you used was equal to 1% of the weight of the oil, then 8.8 grams of catalyst per liter of oil would be about right.
podle toho to vychází +- na 1000g oleje 490ml ethanolu.... , to už je fakt dost...
38,6% z litra je 386ml etanolu 93%-neho
36% je 360ml etanolu 100%-neho
zalezi kolko %-ny etanol mas ty
vychadzam z textu co si sem pastol
EKOCar B100
#1:Octavia Combi '99 Black magic, AHF, EGRoff, TT-puky, 13000lm light.
#2:Octavia '97, modra metaliza, AGR,EGRoff,MAFoff
#1:Octavia Combi '99 Black magic, AHF, EGRoff, TT-puky, 13000lm light.
#2:Octavia '97, modra metaliza, AGR,EGRoff,MAFoff
myslím ale že to bral na hmotnost oleje, ne na objem... jinak odkaz:
http://biodiesel.infopop.cc/eve/forums/ ... 9601000031
http://biodiesel.infopop.cc/eve/forums/ ... 9601000031
Škoda 1.9, 81