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Tannic Acid: Galls Stirred to a Cream with Ether and Pressed (Leconnet)
Leconnet's method (Annalen, 1836), as Thorpe's Dictionary (1913) gives it: stir powdered galls into ether until a thin cream forms, press it, and repeat until no more tannin comes out. Thorpe does not say how the pressed liquid is worked up; evaporating it is ours. Ether is very flammable: no flame, fume hood.
The picture: our diagram.
Kati
1 day
Maagizo
1
1
Stir powdered galls into ether to a thin cream
Stir powdered galls into ether to a thin cream
Grind oak galls finely and stir the powder into ether until the mixture is a thin cream. Ours: a mortar, then a stirrer in a fume hood, no flame.
Vifaa kwa hatua hii:
Vinundu vya mwaloni1 as requiredZana zinazohitajika:
Dietili etha
Kinu na mchi wa jiwe
Kikorogo
Kabati la kutoa mvuke (lenye bomba)
Miwani ya kinga dhidi ya kemikali
Glavu za mpira2
2
Press, and repeat
Press, and repeat
Press the cream to drive out the liquid. Stir the pressed cake into fresh ether and press again; repeat until no more tannin is removed. Ours: a cloth screw press with filter cloth.
Zana zinazohitajika:
Mashine ya skrubu ya kukamua kitambaa
Kitambaa laini cha pamba cha kuchujiaDietili ethaKabati la kutoa mvuke (lenye bomba)3
3
Evaporate the pressed liquid (ours)
Evaporate the pressed liquid (ours)
Thorpe gives no work-up. Ours: evaporate the pressed liquid in a dish on a water bath, no flame, to leave the tannic acid.
Zana zinazohitajika:
Sahani ya Kuvukizia
Bafu la MajiKabati la kutoa mvuke (lenye bomba)Vifaa
1- 1 as requiredKishikilia Nafasi
Zana Zinazohitajika
10- Kishikilia Nafasi
- Kishikilia Nafasi
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- Kishikilia Nafasi
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- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
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