2. Types of reactors and process design in plastic waste pyrolysis
Over the past few decades scientists have discovered that in the absence of oxygen, plastic, which consist of long chain NHS-LC-Biotin chain, can be fragmented at high temperature to form oligomers. The term pyrolysis was used to refer to such process, although it normally refers to thermochemical decomposition of organic materials at high temperature in the absence of oxygen. In some context, the term “cracking” is used instead of pyrolysis. Nowadays, carbohydrates is a common practice to differentiate thermal pyrolysis from catalytic pyrolysis. The former refers to the decomposition of polymers due to the application of heat alone, while the latter refers to the processes where catalyst is utilized to alter the reaction mechanism of pyrolysis, hence the products yield and composition. Some recent studies focused on plastics waste pyrolysis using different processes are shown in Table 3.
2.1. Batch and semi-batch reactor