| CaC2 is an ionic compound composed of Ca2+ and[C≡C]2-(carboanion),and the anion[C≡C]2-is of strong alkalinity and dehydration ability.Therefore,it is of great value to explore its effective use as a strong alkaline and dehydration agent.Mechanochemistry,as an emerging cross discipline,has been successfully applied in many fields,showing good prospects.However,due to the complexity of mechanochemistry itself,there has been a little progress on the study of kinetics of mechanochemical reactions.Therefore,it is of great significance to study the mechanochemistry kinetics and explore its reaction mechanism.First,by studying the reaction of CaC2 and C6C16 at different rotating speeds,the critical rotating speed for the reactions has found,and the mechanical activation energy of these reactions of CaC2 was obtained.By analyzing the reaction conversion rates of CaC2 and C6Cl2(C2Cl6)at different rotating speeds and time,the mechanochemical kinetic equations of CaC2 and C6Cl6(C2Cl6)were deduced based on the kinetic equations of thermochemical reactions and empirical kinetic equations.Both types of equations effectively reflect the relationship between reaction degree and ball milling variables,and their theoretical values and experimental values are basically consistent,indicating their practical applicability.These equations provides a reference and basis for further research on mechanochemical kinetics.Second,for studying the variation of CaCO3 particle size in the milling process,the Benjaminm model was used to derive a specific equation to represent the relationship between particle size and time rotation speed.A universal equation is derived to correlate the particle size and mechanical energy density.The obtained theoretical values and experimental values are consistent,indicating their good applicability.The establishment of the model is helpful to simplify the calculation of the particle size in the ball milling process of calcium carbide,and provides guidance for the experimental design and process optimization.Third,the applicability of the strong alkalinity and dehydration ability of CaC2 is explored for the Cannizzaro reaction of benzaldehyde under both thermal and ball mill conditions.The results show that CaC2 is an effective catalyst for the reaction,forming benzyl alcohol and benzyl benzoate.NMP solvent can positively assist the mechanochemical reaction,and the mechanical ball mill reaction is superior to the corresponding thermal reaction. |
