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Die Umesterung Von Fetten Und Ölen by Hans Paul Kaufmann

Die Umesterung Von Fetten Und Ölen

by Hans Paul Kaufmann
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Book cover type: Paperback
  • ISBN13: 9783663061373
  • Binding: Paperback
  • Subject: N/A
  • Publisher: Vs Verlag Fur Sozialwissenschaften
  • Publisher Imprint: Vs Verlag Fur Sozialwissenschaften
  • Publication Date:
  • Pages: 48
  • Original Price: USD 49.99
  • Language: German
  • Edition: 1963
  • Item Weight: 100 grams
  • BISAC Subject(s): General

Zweck und Vorteile der Umesterung Der Begriff Umesterung wird bei Fetten f�r verschiedenartige Reaktionen angewandt. Er kann sich sowohl auf den Austausch der S�uren als auch auf Anderungen im alkoholischen Rest von Estern beziehen. In vorliegender Arbeit wird der intra- und intermolekulare Austausch der Fetts�ure-Reste im gleichen Glycerid-Molek�l bzw. innerhalb mehrerer Glycerid-Molek�le behandelt. Die Umsetzung von Glyceriden mit einwertigen Alkoholen ist ein in der Technik und bei analytischen Arbeiten oft angewandtes Verfahren. Sie wurde bereits vor 1 mehr als 100 Jahren von E. DUFFY und J. PATRICK beim Erhitzen von Fetten mit Natrium�thylat beobachtet. Im Vergleich hierzu erfordert der Ester-Ester- Austausch drastischere Bedingungen. Diese Reaktion wurde erst in den letzten 20 Jahren eingehender untersucht. Die Anwendung dieser Umesterung auf Glyceride ist von gro em Interesse, da wegen der unbegrenzten M�glichkeiten des Austausches von Fetts�ure-Radikalen eines gegebenen Fettes die Verwen- dungsm�glichkeiten von nat�rlichen Fetten und �len wesentlich erh�ht werden k�nnen. Durch die Umesterung vermag man das Schmelzverhalten von nat�rlichen Fetten und Fettmischungen entscheidend zu beeinflussen. Dergleichen Ver�nde- rungen sind nach herk�mmlichen Methoden durch die Fetth�rtung und durch verschiedene thermische Behandlungen von Fetten m�glich. Die Fetth�rtung, die von W. NORMANN2 in die Fettchemie eingef�hrt wurde, ist geeignet, den Schmelzbereich von Fetten so zu erh�hen, da die meisten �le zur Margarine- Herstellung verwendet werden k�nnen.

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