Particle agglomeration and inhibition method in the fluidized pyrolysis reaction of waste resin

This work investigated the pyrolysis reaction of waste resin in a fluidized bed reactor. It was found that the pyrolysis-generated ash would adhere to the surface of ceramic particles, causing particle agglomeration and defluidization. Adding kaolin could effectively inhibit the particle agglomeration during the fluidized pyrolysis reaction through physical isolation and chemical reaction. On the one hand, kaolin could form a coating layer on the surface of ceramic particles to prevent the adhesion of organic ash generated by the pyrolysis of resin. On the other hand, when a sufficient amount of kaolin (>= 0.2% (mass)) was added, the activated kaolin could fully contact with the Na+ ions generated by the pyrolysis of resin and react to form a high-melting aluminosilicate mineral (nepheline), which could reduce the formation of low-melting-point sodium sulfate and thereby avoid the agglomeration of ceramic particles. (c) 2023 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.