Soxhlet extractors are often coupled to a specifically designed condenser with a very large lower joint.

Is this inherent to it's function as a condenser in the apparatus or only because the Soxhlet Extractor part underneath it needs a big upper joint to get stuff in and out? In other words, is there any drawback to using an adaptor and replacing the condenser by a longer (but thinner) graham condenser?

Preventing flooding might be another reason (for high boiling solvents mainly?).

  • 1
    $\begingroup$ The condensate needs to drop into the carboard vessel with whatever you try to extract from! Also, using a Graham condenser for refluxing is a gross piece of lab malpractice. Never use anything but a regular reflux condenser for refluxing! chemistry.stackexchange.com/questions/608/… $\endgroup$
    – Karl
    Commented Aug 4, 2020 at 8:54
  • $\begingroup$ Hi Karl, thanks for answering! What about a graham atop a dimroth/allihn? My concern is, can I use a standard width condenser above it, or does it really need to be as large as the soxhlet part? Is there any big drawback to an adaptor? $\endgroup$
    – Hans
    Commented Aug 4, 2020 at 8:57
  • 1
    $\begingroup$ No! Put a Dimroth reflux condensor on top of your refluxing setup, and nothing else. If it is too small, use a bigger one. If you think you need to put another one on top as a safety measure, you have already strayed from the path of GLP, don´t do it! $\endgroup$
    – Karl
    Commented Aug 4, 2020 at 9:02
  • 1
    $\begingroup$ Of course you can reduce the NS 45 or larger of the Soxleth down to NS 29 of a regular Dimroth. The joint of the soxleth just needs to be so oversized to get the cardboard tube with your material in. $\endgroup$
    – Karl
    Commented Aug 4, 2020 at 9:28
  • 1
    $\begingroup$ Yes, excess weight, you need more clamps, which means danger of tension. And stacking condensors is useless. The first one must be able to do its job. If it floods, then you need one with bigger diameter, or cooler cooling water. $\endgroup$
    – Karl
    Commented Aug 4, 2020 at 9:33


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.