(572e) Unsteady Kinetics and Thermodynamics through TFE Pyrolysis Production Process Based upon Inherent Safety Assessment

Abstract: As a kind of widely used polymer material, poly-tetrafluoroethylene has a superior performance. The production has been developed greatly. The method of industrialization of tetrafluoroethylene monomer production has been taking HCFC-22 as raw materials for cracking reaction. Normally HCFC-22 pyrolysis could be achieved by making use of the steam diluted technology. For the purpose of analysis of tetrafluoroethylene monomer production process, an inherent safety analysis has been developed in this dissentation. The hazard of material (explosion characteristics, toxicity, etc), technical and device safety, which are required by chemical process, have been taken into account. Emphasis is on the division of process nodes, which respectively consist of cracking section, acid elimination section, distillation section and so on. In this paper, we focus on the unsteady operation process, such as during startup and shutdown, and overhauling has been discussed also. The unsteady thermodynamics and inherent safety analysis of the cracking section in the TFE Pyrolysis Production Process were carried out. Based on the thermal equilibrium equation, the physical and mathematical models were established. Then, the time profiles of unsteady state can be generated. The fuzzy comprehensive evaluation index model was used to analyze the inherent safety, which can provide the theoretical basis for safety design and management.

Key words: TFE, inherent safety, process thermodynamics, unsteady status