| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for controlling concn. of a plant essential oil in a specified space which makes the concn. of the plant essential oil to a specified concn. in the specified space by preventing the plant essential oil from being decomposed and changed in quality caused by heating and warming and controlling accurately amt. of evaporation of the plant essential oil per unit time in accordance with vol. of the space, ventilation speed, absorbing speed, or the like. SOLUTION: In this method, a plant essential oil dissolved in a water-soluble alcohol is evaporated by using an ultrasonic oscillator and the plant essential oil is evaporated from an emulsion liq. of the plant essential oil obtd. by a method wherein water is incorporated and the mixture is agitated at high speed and the plant essential oil is evaporated by opening a sealed container wherein a mixed material in which the plant essential oil obtd. is adsorbed and impregnated by using at least two kinds of materials selected from a plurality of porous materials and fibrous materials with different adsorbing and impregnating abilities to a specified plant essential oil is stored.
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