Quasi Continuous Method

For the production of highly volatile peppermint oil, mobile distillation equipment has been developed [9, 17]. The plant material from the field is chopped into a mobile container, which can be directly used as a still by its connection to a stationary steam generator and a condenser with an attached oil separator. A so-called mint cooker (Newhouse, Redmond, WA) was designed to achieve a quasi-continuous operation through the alternating usage of two or more containers. However, energy losses cannot be avoided during heating and cooling cycles of the still. This technology has proven its effectiveness for the production of highly volatile monoterpene-containing oils. It should be examined whether this method is also suitable for the production of low volatile sesquiterpene-containing chamomile oil.

Distillation apparatus

Distillation apparatus

Steam

Condensed water

FIGURE 8.3.2 Batch steam distillation [1].

Cooling water

Cooler

Florentine bottles

Oil/Organic solvent

Water phase

Steam

11 Distillate container

Condensed water

FIGURE 8.3.2 Batch steam distillation [1].

FIGURE 8.3.3 Continuous distillation apparatus [2]. 8.3.3.3 Continuous Method

A still originally developed for the production of ethanol derived from marc enables a continuous operation (Figure 8.3.3).

The plant material is introduced into the distillation chamber through a conveyor belt. The steam flows against the plant material through a distributor plate. The steam saturated with oil leaves the still through the vapor outlet. To prevent the formation of canals, a stirrer is provided to ensure a uniform throughput and distribution of steam. The distillation waste is finally ejected by

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