Objectives and

Essential Oil Production

The steam distillation remains a major technology, ensuring a high and sustainable quality of the extracted oils [18]. Depending on the mode of contact between the plant material and the steam and/or water are distinguished three types of process – dry steam distillation, direct steam distillation and hydrodistillation [18]. In all the three cases, besides the waste vegetable mass and the essential oil, there are two more liquid fractions – aqueous condensate (hydrolat, hydrosol) and extract (residual water). These waste fractions have traditionally been underestimated as a source of high value-added substances due to their low concentration and the susceptibility of the contained biologically active substances to oxidation and degradation at high temperature.
Цел на проекта

for nanofiltration application

The lack of data for the application of nanofiltration in this sector, on the one hand, and its proven potential for application in the isolation of valuable components of the target type of plant raw materials, on the other hand, while ensuring high quality of the products obtained and low specific energy costs, highlight the topic as attractive research gap of great importance to Bulgaria and other countries with developed essential oil industry.

Accomplishment of the research goals

In order to achieve the aim of the project proposal, it is supposed to use the theoretical achievements in the field of quantum chemistry, thermodynamics, engineering design of processes and mechanisms of mass transfer in nanostructured semipermeable membranes. Such an approach will allow rationalization of the planned intensive experimental work in the field of several fundamentally different processes: nanofiltration, steam distillation, solid-liquid extraction, crystallization and drying/microencapsulation in a spouted-bed. Both chemical analyzes and microbiological tests will be used to characterize the materials.

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