Microwave, as a kind of variable frequency electromagnetic wave, is used in the chemical synthesis of medicine, and its reaction speed is ten to thousands of times faster than the conventional method. Due to the particularity of the mechanism of action such as the pyrogenic effect and induced catalytic effect of the microwave, it can promote chemical reactions without the need for solvents, which can avoid the use of higher-priced or toxic solvents, which reduces costs and toxicity. And the operating conditions (such as the degree of heating, the acidity, and alkalinity of the solution, etc.) are well controlled, and it is convenient to monitor the degree of reaction by thin-layer chromatography (TLC). Easy to purify and other advantages, but also save energy, experimental atom economical synthesis, and eco-friendly green synthesis.

 

Continuous microwave chemical reactors have different yields when heating methods, microwave radiation power and time, and reaction bottle placement are different. The microwave function improvement method can overcome the long reaction time, uneven heating, and controllability of the microwave method before improvement. And poor repeatability. Compared with the traditional method, the operation procedure is greatly simplified, the operation conditions are easier to control, the feeding time and reaction time are shortened, and the raw materials and products are prevented from being heated and oxidized for a long time, which is convenient for monitoring the degree of reaction and the yield is significantly improved.

 

Microwave chemical reactor is a chemical reaction device that uses microwave heating. It has the advantages of fast heating speed, uniform heating, selective heating, and can promote the rate of the chemical reaction. It can not be replaced by traditional reaction devices and is becoming more and more widely used. For organic synthesis, extraction and related occasions in the fields of materials, pharmaceuticals, chemicals, related laboratory research, and teaching.

 

The microwave chemical reactor system can sample and process the temperature of the reactants in the reactor in real-time, and use the PID control algorithm with variable proportional and integral coefficients to calculate the system control amount. The bidirectional thyristor is triggered based on the zero-crossing of the control amount. The on-time in its cycle controls the average output power of the microwave in the cycle of the microwave power source, and finally realizes the constant temperature heating of the reactants in the microwave chemical reactor by the microwave.