In the last decade, the utilization of waste by-product apple pomace has been extensively researched (due to its difficult disposal) and currently finds beneficial usage in various industries; as substrate for microbial growth or recovery of pectin, xyloglucan and polyphenols. In this research apple juice was produced at pilot scale. Furthermore, apple pomace was employed as substrate for the production of pectin, biofuel (pellets) and concentrated apple pomace extract. Extensive mass and heat balances were conducted to evaluate the feasibility of this approach on industrial scale. The produced pellets had very similar characteristics to wood pellets (net calorific value of 20.3 MJ/kg). Dried apple pomace contained 11.9% of pectin. Fed-batch cultivation of baker´s yeast with apple pomace extract demonstrated a potential for partial substitution of molasses in industrial bioprocesses. This concept shows how a zero discharge biorefinery process converts waste from apple juice production into three valuable products enabling connections between different industries.
Graphic Abstract
Hauptaugenmerk dieser Arbeit wurde auf die Tauglichkeit der UNIFAC‐Methode in Bezug auf die batchweise Azeotroprektifikation eines Essigsäure/Wasser/Ethylacetat‐Gemischs gelegt. Experimentelle Daten einer batchweisen Azeotroprektifikation mit vorgeschalteter Gegenstrom‐Flüssig/Flüssig‐Extraktion im Pilotmaßstab wurden generiert. Eine schnellfunktionierende Analytik wurde entwickelt und vorgestellt und die gewonnenen Daten wurden für die Validierung der numerischen Simulation verwendet. Der allgemeine Verlauf der Rektifikation, insb. die Kopftemperatur und Destillatzusammensetzung, wurde von dem Modell bestätigt.
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