The four major functions of ultrasonic catalytic acceleration reaction equipment
Ultrasonic catalytic acceleration reaction equipment is composed of three parts: ultrasonic vibration components, ultrasonic drive power supply and reaction kettle: ultrasonic vibration components mainly include high-power ultrasonic transducer, booster, horn(transmitting head), used to generate ultrasonic vibration, And launch this vibration energy into the liquid. The transducer converts the input electrical energy into mechanical energy, namely ultrasound. Its manifestation is that the transducer stretches back and forth in the longitudinal direction, and the amplitude is generally several microns. Such amplitude power density is not enough and cannot be used directly. The horn amplifies the amplitude according to the design requirements, isolates the reaction solution and the transducer, and also plays a role in fixing the entire ultrasonic vibration system. The horn is connected with the horn, the horn transmits the ultrasonic energy vibration to the horn, and then the ultrasonic energy is emitted into the chemical reaction liquid by the horn.
The four major functions of ultrasonic catalysis acceleration reaction equipment:
1. It has the effect of stirring and homogenizing the liquid. The large-amplitude ultrasonic wave radiates into the liquid medium, which can cause the molecules of the liquid medium to vibrate violently. Compared with simple heating and mechanical stirring, the stirring effect of ultrasonic wave can make the chemistry more effective. The reactants are fully mixed to increase the contact area between molecules, thereby promoting the chemical reaction more efficiently and quickly.
2. Ultrasonic waves produce cavitation effects in the liquid, producing countless impromptu small bubbles in the liquid, and bring about large pressure changes and temperature changes in the microscopic environment. With the generation and extinction of the small bubbles, the microscopic environment Temperature changes of hundreds of millions of degrees per second will occur. Although the heating point lasts for less than one million minutes, it accelerates the chemical reaction of the molecules in the heating point.
3. Because there is an alternating period of positive and negative pressure in the ultrasonic transmission in the liquid, the particle of the medium can produce a significant sound pressure effect. When the liquid medium is irradiated with an ultrasonic wave with a large enough amplitude, the liquid medium will break. Gas microbubbles are formed, and the microbubbles are further enlarged to form cavitation bubbles. The cavitation bubbles collapse on the liquid wall under the high-amplitude ultrasonic high pressure. The kinetic energy of the collapse is instantly transformed into the internal energy of the substance in the cavitation bubbles, so several The high temperature of 1000K causes the molecules in the cavitation bubble to dissociate thermally and become a low-temperature plasma, thereby enhancing the reactivity of the chemical reactants, that is, increasing the collision and contact between molecules or ions, making the chemical reaction proceed quickly.
4. Can ultrasound have such a wide range of applications? It turns out that it is mainly due to the ultrasonic cavitation reaction. When the ultrasonic energy is high enough, the phenomenon of "ultrasonic cavitation" will occur, which means that the tiny bubbles (cavitation nuclei) in the liquid vibrate and grow under the action of the ultrasonic field. And continuously accumulate the sound field energy, when the energy reaches a certain threshold, the cavitation bubble collapses and closes rapidly.
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