Boffis
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The meaning of an old German term
I am reading some old German papers about the chemistry of imidazole and 2,2'-bis-imidazole from the 1920s and 30s and I have come across a term that
has left me mystified:
Does anyone know what "Zehnkugelrohrs" means? Depending on how you read "kugel" it can mean sphere, shot, ball, pellet etc. However, the usage
suggests something like an absorption tube or bubbler, for example in:
Nach dieser Zeit war die Abspaltung basischer Dämpfe beendet; auf der Lauge schwamm eine bräunliche Ölschicht. Das Zehnkugelrohr enthielt Wasser
mit 7.294g Salzsäure (200 Millimole).
Can anyone help please
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Antigua
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I'm not a German at all, but isn't kugelrohr like a Rotovap apparatus? And zehn is 10, so something like that? Carl, come here  !
edit: or not exactly a rotovap, more like a short-path distillation apparatus meant for products and not solvents?
[Edited on 15-11-2020 by Antigua]
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RedDwarf
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There is a shortpath distillation apparatus kugelrohrs that consists of a glass pipe linking a number of glass bulbs. The idea is that you place the
first glass bulb in some sort of tube heater, the second bulb is outside the heater, so you get short path distillation from bulb 1 to bulb 2. If you
want greater purity then you push bulb 2 into the heater as well so you get a secondary distillation into bulb 3. Guessing, I'd assume a
zehnkugelrohrs would be a ten stage kugelrohrs with ten bulbs?
Edit: Just in case you were wondering the tube is kept horizontal, so only the lower third of the bulb is of use.
[Edited on 15-11-2020 by RedDwarf]
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MadHatter
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Zehnkugelrohrs
Ten-ball tube from Google translate.
From opening of NCIS New Orleans - It goes a BOOM ! BOOM ! BOOM ! MUHAHAHAHAHAHAHA !
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karlos³
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Have a look at this here: https://books.google.de/books?id=cSl9BwAAQBAJ&pg=PA57&am...
Its the thing right on the bottom near the apparatus.
In that specific example it contains a NaOH solution and is used for the absorption of CO2 for later titration.
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Boffis
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Hi guys, many thanks for your responses, yes some kind of absorption equipment is certainty what is implied from the text. In this case the tube
contains hydrochloric acid to capture "basic vapours".
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