The volatile loss in spray drying was measured at several points in a spray dryer. The mechanism of the loss was discussed.
The measurment showed that within a certain range of solute concentration the volatile loss in vicinity to the spray nozzle was very large and larger than the estimated value by the Selective Diffusion Theory.
On the other hand, when the solute concentration was increased, the volatile loss in the nozzle zone became smaller and close to the value which was estimated by the Selective Diffusion Theory.
These results mean that the dominant mechanism of volatile loss exists in different stage according to operating condition (i.e.solute concentration) of drying.
In the practical operation of spray drying, prevention of the volatile loss is quite important, since the solute concentration generally falls in the region where the large volatile loss in the nozzle zone takes place.
The higher retention of volatile component was achieved not by increasing viscosity but by adding a small amount of food additive polymer without decreasing dry rate. It was considered that food additive polymer reduced the volatile loss in nozzle zone.
KeywordsWater Retention Volatile Component Spray Dryer Spray Nozzle Volatile Loss
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- 3.Ban, T., Kagaku Kogaku Ronbunshu (in Japanese), vol. 5, 213 (1979).Google Scholar
- 6.Thijssen, H.A.C., and Rulkens, W.H, De Ingenieur Vol. 80, Ch45 (1968).Google Scholar
- 7.Rulkens, W.H., and Thijssen, H.A.C.,._ TRANS. INSTNCHEM. ENGRS. Vol. 47, T292 (1969).Google Scholar
- 9.Kef, P.J.A.M. and Schoeber, W.J.A.H., Advances in preconcentration and dehydration of foods, p. 349 (1974).Google Scholar
- 10.Tsujimoto, S., Matsuno, R., and Toei, R., Kagaku Kogaku Ronbunshu (in Japanese), vol.8,103 (19$2).Google Scholar
- 11.Furuta, T., Tsujimoto, S., Makino, H., Okazaki, M., and Toei R., J. of Food Eng. to be published.Google Scholar
- 12.Furuta, T., Tsujimoto S., Okazaki, M., and Toei, R., J. on Drying Technology to be published.Google Scholar
- 13.Furuta, T., Tsujimoto, S., Okazaki, M., and Toei, R., Proceeding of ICEF 3 at Doublin.Google Scholar