Abstract
Reaction thermal runaway, caused by excessive temperatures of the reaction system, threatens the safety of operators. Latent heat storage by phase change materials (PCMs) has the advantages of high energy storage density and stable temperature during the energy storage process, which was widely applied in many fields and provides a new idea for the temperature control of thermal runaway reactions. In this study, microencapsulated phase change materials (microPCMs) with a melamine-formaldehybe (MF) resin shell was fabricated by in situ polymerization. The characterization of the micro morphology, chemical bonds, crystal structure, thermal properties, and thermal stability of microPCMs showed that the prepared microPCMs had integrated spherical morphologies and smooth surfaces, with an encapsulation ratio of approximately 70% and good thermal stability. Furthermore, taking the esterification of propionic anhydride (PA) and 2-butanol (2B) as examples, n-octadecane@MF resin microPCMs was used to control the reaction temperature under various operation conditions in semi-batch reactors. The experimental results showed that the mechanism of the n-octadecane@MF resin microPCMs on the control of reaction temperature in semi-batch reactors was the combination of both physical and chemical interactions. The applications of microPCMs for the control of reaction temperature hold great potential for use in industrial processes.
Highlights
Reaction inhibition is an emergency treatment measure to reduce the harm of thermal runaway of exothermic reactions [1]
The results showed that the addition of microPCMs could alleviate the uneven distribution of temperature in the reactors and reduce the formation of local hot spots in the reaction system, preventing the occurrence of thermal runaway accidents and improving the selectivity of products
To verify the potential of using microPCMs as reaction inhibitors, a type of microPCM consisting of n-octadecane as the core material, encapsulated with a MF resin as the shell material, was characterized by in situ polymerization based on dehydration condensation between melamine and formaldehyde
Summary
Reaction inhibition is an emergency treatment measure to reduce the harm of thermal runaway of exothermic reactions [1]. The results showed that the addition of microPCMs could alleviate the uneven distribution of temperature in the reactors and reduce the formation of local hot spots in the reaction system, preventing the occurrence of thermal runaway accidents and improving the selectivity of products. Qiang Chen et al [41], taking the batch esterification reaction in a kettle reactor combined with the DIV criterion model as the research subject, conducted reaction inhibition experiments while adding different amounts of n-octadecane@SiO2 nano-PCMs at different warning temperatures. N-octadecane encapsulated with MF resin as the shell material was prepared by in situ polymerization, and its properties were characterized On this basis, semi-batch esterification reactions under different operation conditions were the focus of the research topic, in order to explore the influence of different amounts of microPCMs on the effect of temperature control based on different esterification reactions at different addition temperatures
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