THE PRINCIPLE OF ULTRASONIC EMULSIFICATION
Phacoemulsification refers to a process in which two (or more than two) insoluble liquids are mixed to form a dispersion system under the action of ultrasonic energy, and one type of liquid is evenly distributed in another liquid to form an emulsion.
Ultrasonic emulsification has the following features compared to general emulsification processes and equipment (such as propellers, colloid mills, homogenizers, etc.):
1. High emulsification quality
The resulting emulsion has a small average droplet size of 0.2 to 2μm, a narrow droplet size distribution range of 0.1 to 10μm or less, a high concentration, a pure emulsion concentration of up to 30%, and an emulsifier of up to 70%. .
2. Emulsion stability
Emulsifiers can be used without or with less to produce a stable emulsion, and some can be stable for months to more than six months, with low energy consumption, high production efficiency, and low cost.
3. Can control the type of emulsion
Under certain sound field conditions, both o/w (oil-in-water) and w/o (water-in-oil) emulsions can be prepared. However, this is not possible with mechanical emulsification. Only the nature of the emulsifier can control lactic acid. Types of. For example, when toluene is emulsified in water, one type of emulsion can be formed under low sound intensity conditions, while another type of emulsion can be formed under high sound intensity conditions.
4. Low power required to produce emulsion
Such as: preparation of 4.55m3 / h, droplet size of 1μm emulsion, if the reed whistle, when the working pressure is 10.5 ~ 14.1kg/cm2, only 5 to 7 horsepower drive power, and the use of high pressure homogenizer When the working pressure is 70.3 to 351.6 kg/cm2, 40 to 50 horsepower is required.
Phacoemulsification can also produce emulsions which cannot be obtained at all by the general method. For example, ordinary stirring can only obtain 5% paraffin wax in water, and in the sound field, 20% paraffin emulsion can be obtained. Fuel oil phacoemulsification, combustion.
Has been promoted and applied in the country for many years. In this process, no emulsifiers are needed, and the particle size of the water droplets in the emulsified oil is about 1μm, and the energy saving effect is 6% to 25%, 40% to 90% of soot is reduced, and the effect of reducing NOx 20% to 75% is achieved. Adding a small amount of water to the kerosene blended fuel for phacoemulsification and mixing can produce a stable suspension of kerosene, containing more than 40% of coal, which is convenient for storage and transportation, and has significant benefits. On the other hand, ultrasound can demulsify emulsions at low sound levels and frequencies.
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