Untersuchung Des Wärmeüberganges in Einem Dünnschichtverdampfer
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Hitzeempfindliche Produkte, zu denen fast alle organischen L�sungen, Geruchs- und Geschmacksaromen, Vitamine, Eiwei stoffe, Pflanzenextrakte und viele pharmazeutischen Pr�parate geh�ren, m�ssen bei ihrer Destilla- tion, bzw. Eindampfung, mit besonderer Vorsicht behandelt erden. Unter der Einwirkung von bestimmten Temperaturen k�nnen wichtige Bestandteile dieser Produkte zersetzt werden oder durch Polymerisation, bzw. Verhar- zung, unbrauchbare R�ckst�nde gebildet werden. Das Ausma der Sch�digun- gen h�ngt neben der H�he der Temperaturen auch von der Zeitdauer ab, w�hrend der die Produkte der Erhitzung ausgesetzt werden. Zur schonen- den Behandlung temperaturempfindlicher Substanzen wird daher im wesent- lichen die Herabsetzung der Verdampfungstemperaturen und die Verk�rzung der Verweilzeiten gefordert. Das Streben nach niedrigen Verdampfungstemperaturen f�hrt zivangsl�ufig zur Vakuumdestillation, die nur zu leicht mit einem kostspieligen appa- rativen Aufwand verbunden ist. Bei vakuumdichter Ausf�hrung werden die Anlagen hierbei immer gr� ere Abmessungen annehmen und die sich daraus ergebende Br�denverdichtung kann ein solches Verfahren st�ranf�llig und auch unwirtschaftlich machen. Daher senkt man das Vakuum nur bis zu einem bestimmten wirtschaftlich noch tragbaren Ma ab. Im praktischen Betrieb wird eine Erniedrigung der Verdampfungstemperatur au erdem noch begrenzt durch die Temperatur des verf�gbaren K�hlwassers und durch die Erstarrungstemperatur des zu verdampfenden Gutes, bzw. seiner einzelnen Komponenten. In allen solchen F�llen, in denen nun die Senkung der Ver- dampfungstemperatur auf das gew�nschte Ma technisch nicht durchf�hrbar oder wirtschaftlich nicht tragbar erscheint, kann man nur noch die Ver- weilzeit desProduktes im Verdampferteil soweit reduzieren, da eine Sch�digung seiner hitzeempfindlichen Bestandteile ausgeschlossen ist.
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Rich Dad Poor Dad: What the Rich Teach Their Kids about Money That the Poor and Middle Class Do Not!
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