Abstract：The decomposition of ammonium chloride and the separation of the products are key technologies for the integration of soda ash and vinyl chloride processes using magnesium oxide as a chemical looping carrier. The whole process consists of two steps: releasing reaction of ammonia and chlorine. The kinetic mechanisms of the two reactions were studied in a fixed bed reactor under isothermal condition. The effects of temperature, reactant particle size, reactant molar ratio and partial pressure of steam on the reaction rate were quantitatively investigated. The results show that the mechanism of the ammonia release reaction is a random nucleation-rapid growth mechanism with an apparent activation energy of 50.27 kJ/mol. The mechanism function of the chlorine release reaction is a two-dimensional interfacial reaction (columnar particles) with an apparent activation energy of 65.00 kJ/mol; the specific surface area of magnesium oxide plays a key role in both reactions; the reaction rate of the chlorine release reaction is proportional to the molar fraction of steam in the gas phase. The obtained results can provide theoretical guidance for the design and optimization of industrial process.
PAN Teng,QIN Wei,LIU Yan et al. Thermal Decomposition Kinetics of Ammonium Chloride with Magnesium Oxide as Chemical Looping Carrier[J]. 化学反应工程与工艺, 2019, 35(2): 143-151.
