Ozone physical properties
Ozone (O3), with its peculiar smell is named, it is an allotrope of oxygen (O2), composed of three oxygen atoms, molecular formula for O3, molecular weight of 48. Ozone has strong oxidation, the oxidation reduction potential after fluoride, ranking the second place, after sterilization quickly decomposed into oxygen (O2), at the same time, ozone has a high energy, under normal temperature and pressure, easily decomposed into molecular oxygen and active oxygen with strong oxidizing power and eventually become a oxygen (O2) no secondary pollution. The main physical properties of ozone are shown in the following table:
Melting point（℃）（760mmHg） | －192.5±0.4 | boiling point（℃）（760mmHg） | －111.9±0.3 | critical temperature（℃） | －12.1 | critical pressure（atm） | 54.6 | Critical volume（cm3/mol） | 111 | Gas density（g/l）（0℃） | 2.144 | Evaporation heat（J/L）（-112℃时） | 316.8 | Critical density（g/ml） | 0.437 |
temperature
（℃） | Liquid density
（g/cm3） | Liquid vapor pressure
（mmHg） | temperature
（℃） | Liquid density
（g/cm3） | Liquid vapor pressure
（mmHg） | －183 | 1.574 | 0.11 | －140 | 1.442 | 74.2 | －180 | 1.566 | 0.21 | －130 | 1.410 | 190 | －170 | 1.535 | 1.41 | －120 | 1.318 | 427 | －160 | 1.504 | 6.75 | －110 | 1.347 | 865 | －150 | 1.473 | 24.3 | －100 | 1.316 | 1605 |
Ozone slightly soluble in water, standard pressure and temperature (STP), the solubility of 13 times greater than oxygen, 25 times greater than the air.
Ozone chemistry
The chemical nature of ozone is very unstable, in the air and water will be slowly broken down into oxygen. Due to the release of a large number of heat when the ozone decomposition, so when the concentration of 25% or more, it is easy to explode. However, it is difficult to more than 10% of the ozone concentration in the air, and in the long history of ozone for drinking water treatment, there is no case of the ozone explosion. The oxidation of ozone is very strong, and its redox potential is only next to F2, which is mainly used in its application. Ozone can react with inorganic substances (such as ferrous, manganese, sulfide, sulfur cyanide, cyanide, chlorine, etc.). Ozone and organic matter (such as: Department of alkenes and aromatic compounds, nuclear protein (amino acid), organic ammonia, reaction, ozone oxidation order in the following mixtures: hydrocarbons > amine > phenol > polycyclic aromatic hydrocarbons > ethanol > aldehydes > alkanes.
Ozone production
Due to the ozone is very unstable, so only in situ production, manufacturing of ozone in a variety of ways, one of the most large-scale economic production method is the use of corona discharge the air or oxygen into the discharge tube, in corona discharge under the action of atomic oxygen to ozone, as shown in the formula:
O + O2 - O3
Ozone application
Due to the strong oxidation and instability of ozone, ozone is widely used in sterilization, odor removal, preservation of fruits and vegetables, and the preservation of fruits and vegetables. In developed countries, ozone has been widely used in food processing, beverage production, ocean transportation and food and beverage industry and other industries. And in our country, ozone utilization rate is low, the late start, but with people's awareness and understanding of ozone, in medicine, food, chemical, textile, papermaking, printing and dyeing, electronics, agriculture etc. industries has been widely application of ozone for disinfection and sterilization, decoloring and removing the flavor, bleaching, and precipitation of heavy metals such as.
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