Die mikrochemischen Methoden dienen vor allem der Aufgabe, chemische Reaktionen mit geringen Substanzmengen auszufuhren, d. h. mit Mengen, die wesentlich kleiner sind, als man sie bei gewohnlichen „Makro“-Verfahren benutzt. Man arbeitet mit Milligrammen oder Bruchteilen davon bzw. mit wenigen Tropfen Flussigkeit. Zu diesem Zweck mussen in erster Linie die notigen Gerate entsprechend verkleinert werden, ganz gleich, ob es sich um analytische oder praparative Verfahren handelt. Diese Verkleinerung der Gerate ist aber oft nicht in einem der Verringerung der Substanzmenge entsprechenden Mas moglich (2).

/pdf/praparative-mikromethoden-in-der-organischen-chemie-1dujodx95o.pdf

Präparative Mikromethoden in der organischen Chemie

Durch Anlegen eines Temperaturgefalles wird in einer neuartigen Apparatur der Unterschied der Partialdrucke der fluchtigen Substanz in den Losungen vergrosert und durch Warmekonvektion ein Gaskreislauf erzeugt, mit dem die fluchtige Substanz schnell von einer Losung zur anderen uberfuhrt wird.

Apparat zur wärmebeschleunigten Mikrodiffusion

Distillation-Diffusion Unit

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Distillation-Diffusion Unit