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Designing the Internal Porous Structure of Soluble Coffee Particles to Improve Freeze-Drying and Functionality

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Designing the Internal Porous Structure of Soluble Coffee Particles to Improve Freeze-Drying and Functionality (Volume 22) (English shop)

Patrick Levin (Author)


Table of Contents, PDF (82 KB)
Extract, PDF (230 KB)

ISBN-13 (Hard Copy) 9783736977266
ISBN-13 (eBook) 9783736967267
Language English
Page Number 152
Lamination of Cover matt
Edition 1.
Book Series SPE-Schriftenreihe
Volume 22
Publication Place Göttingen
Place of Dissertation Hamburg
Publication Date 2023-01-10
General Categorization Dissertation
Departments Mechanical and process engineering
Allgemeine Verfahrenstechnik
Keywords soluble coffee, porous structure, structure formation, pore size, porosity, gassing, foam, ice crystals, crystalization, scraped surface heat exchanger, freezing rate, temperature cycling, freeze-drying, drying kinetics, modeling, optimization, reconstitution, material properties, löslicher Kaffee, poröse Struktur, Strukturbildung, Porengröße, Porosität, Begasung, Schaum, Eiskristalle, Kristallisation, Schabewärmetauscher, Gefriergeschwindigkeit, Temperaturwechsel, Gefriertrocknung, Trocknungskinetik, Modellierung, Optimierung, Rekonstitution, Materialeigenschaften, Kaffeeaufschlämmung, coffee slurry, Struktur von Lebensmittelpulvern, structure of food powders, Rekonstitution von Pulvern, reconstitution of powders, kritische Mizellenkonzentration, critical micelle concentration, kontinuierlicher Rührkesselreaktor, continuous stirred tank reactor, Differential-Scanning-Kalorimetrie, differential scanning calorimetry, dynamische Dampfsorption, dynamic vapor sorption, Guggenheim, Anderson, de Boer, Hochschermischen, high shear mixing, lichtemittierende Diode, light-emitting diode, LED, relative Luftfeuchtigkeit, relative humidity, Brechungsindex, refractive index, Rasterelektronenmikroskopie, scanning electron microscopy, Gesamtfeststoffgehalt, total solids
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The objective of this work was the understanding of the internal pore structure creation of instant coffee. It includes the question which parameters are influencing the pore structure and mapping the applicable ranges. The influence of these structural parameters on the drying kinetics were investigated in experiment and modeling, finding the optimal approach to increase the drying kinetics. The reconstitution behavior of the dried powder structures was analyzed to link the process optimization to product quality aspects.
The instant coffee was structured in a scraped surface heat exchanger and with different freezing methods, where samples were gassed with nitrogen and carbon dioxide. The amount of gassing, the total solids content, the coolant temperature, the scraping speed, temperature cycling and the freezing rate of the slurry during hardening were shown to influence the morphology of the samples, where total solids content, gassing, temperature cycling and freezing rate showed a dominant influence in the investigated range on structure parameters like open porosity, closed porosity and the median pore diameter, obtained after drying. It could be shown that the pore diameter has the biggest potential to improve drying and reconstitution kinetics.