The Essence of Efficiency: Microencapsulation Contains the Power of Essential Oils

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Glatt Ingenieurtechnik GmbH

CAC ENGINEERING GMBH

Pörner Ingenieurgesellschaft mbH

Adjustments of the formulation, rate of spraying and layer temperature resulted in optimal encapsulation conditions for this mode of operation and yielded a maximum possible oil recovery rate in the granules. Nevertheless, depending on the material system used, up to 20 per cent of the active substances will still be lost in such a system. Consequently, a higher oil recovery rate of the granules can only be achieved with a different processing gas flow management.

Performing the encapsulation in a closed cycle mode offers the possibility of reducing the decisive partial density ratio of particle to gas. The recirculation of the exhaust air allows selective adjustment of the oil concentration in the supply air. The resulting increase of the partial pressure of the oil in the supply air has an immediate effect on the transport of liquid in the granules during the encapsulation process. Thus, the reduced partial pressure gradient of the oil between the particle and the ambient gas leads to reduced oil loss in the granulation process.

Closed Cycle Encapsulation

Compared to a single-path process, the encapsulation process in closed cycle mode results in clearly less contaminated air that needs to be treated prior to being discharged into the environment.

Since it is only the amounts of gas introduced in the cycle operation (e.g. atomizing gas, pneumatic filter cleaning) that have to be removed from the system and treated, the energy and material input for cleaning the exhaust air is significantly lower for the same granulation performance.

Operating a continuous microencapsulation process in closed cycle mode requires an additional processing step for treatment of the exhaust air. Condensable components, for example water used as a solvent for the solid matter, have to be condensed and discharged from the cycle as otherwise the supply air would be saturated with solvents which prevents a proper drying process of the granules.

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