ISSN:
0009-286X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
Selective drying of mixture-containing products. Properties and quality of products containing solvent mixtures can be influenced considerably by the drying process. This concerns, e. g. the aroma content of fruit concentrates, the tear resistance of paper, the intensity of the colour of pigments, the ductility of cable insulation, toxic residues in tablets, residual monomers in polymers, etc. Both, the amount of residual moisture and its composition are of decisive importance. Predictions are possible given a knowledge of both the course of the drying curve and the course of the composition curve. The latter results from five basic physical processes, viz. vapour-liquid-solid phase equilibria, diffusion in the gas phase, diffusion in the liquid phase, capillary flow, and heat transfer. This combined action can be described both theoretically and experimentally for simple but indicative cases. There result practical hints for the choice of dryers and drying conditions to fulfill the demands placed on the properties of the dried product.
Additional Material:
15 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cite.330591103
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