There are three methods of processing and distilling citronella: 1. Distillation in water: also known as boiling or bubble steaming. The lemon leaves were distilled in a distiller and the citronella oil was distilled off. Add water to the pot so that all the raw materials can be put into water. The advantages are simple equipment, low cost, easy to move. The disadvantage is that some are not easily distilled. Some volatile substances such as aldehydes can easily cause condensation and reduce oil yield and oil quality. The distillation time is as long as 5 to 6 hours, consumes much fuel, and water distillation is rarely used in general production. 2. Water distillation: a method commonly used in production, also known as atmospheric steam distillation. A separator (false bottom) was added to the above distiller to separate the raw materials from the water and use the steam generated by the distiller itself for distillation. Steam is always a saturated wet steam and cannot be superheated steam. Plant raw materials only come in contact with steam without contact with boiling water. This method should pay attention to maintaining a certain amount of water in the pot to prevent the device from leaking. The advantages are: the equipment is simple, the cost is low, and the movement is convenient; the hydrolysis of citronella oil can also be reduced, and the oil yield is higher than that in the water distillation method. The disadvantage is that for certain higher boiling components, it is not easy to distill it out with atmospheric steam distilled on water. 3. Steam Distillation: Distilling the citronella oil to the other steam boiler occurs, using a steam pipe to distill the bottom of the steamed distillate, called steam distillation. Distillation can be carried out with the steam supplied by atmospheric boilers, with a certain pressure, said high-pressure distillation. Due to the high velocity of the steam and the high temperature, the rate of distillation can be accelerated. Generally only 2.5 to 3.5 hours per steaming, the higher boiling components of citronella oil can easily be distilled out. The advantages are: there are usually 2 to 4 steamed buns, which can be diverted continuously around the clock, with high oil yield and low fuel consumption. The disadvantages are: high equipment costs and inconvenience to move, which are only suitable for fixed-scale large-scale production.
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