Drying of Herbal Product in Closed System

Abstract

A new product from low temperature drying method which reduces the loss of highly volatile essential oils is presented. The proposed drying method consists in evaporation/sublimation of water and aromatic substances in a dryer with a closed drying agent cycle. In parallel, the evaporated compounds are continuously condensed in a heat exchanger. As a result of the drying process high-quality dried plants and fluidolat as liquid phase containing water and volatile organic compounds are obtained. The aim of presented investigations was to optimize the developed technology for herb of lavender.

Closed flow solar dehydration with the use of silver nanoparticles: Application for the production of Pouteria lucuma flour

“…As a result, no volatile compounds contributing to the flavor and aroma of lucuma are lost, several authors consider the importance of drying fruits in closed flow systems. [25,26] Moreover, considering that the dehydration process was gradual, there was a lesser risk of damaging the cellular structure of the fruit and releasing the volatile compounds.…”

“…[24] Closed flow dehydration increases the drying speed, generates a faster increase in the temperature of the dehydration chamber, and also prevents the aroma of the fruit from being lost. [25][26][27][28][29] A process that allows to minimize the losses of its organoleptic properties is lyophilization, reducing undesirable changes, resulting in high quality products, but with high sales costs. [30][31][32] Solar thermal systems consist of a receiver or collector, thermal energy storage and power pack, if required.…”