Development and Application of a Microwave Reactor Radiating through a Leaky Coaxial Antenna

A novel microwave ( MW) reactor radiating through a leaky coaxial antenna with an impedance matching unit was developed. The MW energy could be effectively transmitted from the power source to the reactor with a uniform distribution of the electromagnetic field. Simulations of the MW radiating indicated the excellent radiation capacity of electromagnetic waves and a uniform axially extended cylinder MW field around the antenna. The simulation result was in accordance with the antenna efficiency measurements and the temperature distribution. Model reactions of benzoyl hydrazine preparations performed in an open vessel under atmospheric pressure and the preparation of 3-acetylcoumarin in a sealed reactor under pressure proceeded smoothly on a scale of hundreds of grams.