Reaction kinetics of ethylenediamine hydrochloride with calcium hydroxide
The industrial production process of diamino silane coupling agent results in the generation of a significant quan-tity of ethylenediamine hydrochloride by-product.This by-product can be repurposed via neutralization reaction with cal-cium hydroxide to acquire anhydrous ethylenediamine.The conductivity method was utilized to establish the interdepen-dence of ethylenediamine hydrochloride conversion rate and conductivity.The impact of various factors including liquid-solid ratio,salt concentration,and temperature on the conversion rate of ethylenediamine hydrochloride was explored and the optimal process conditions were determined.The experimental results indicated that the conversion rate of ethylenedi-amine hydrochloride was declined with the increase of liquid-solid ratio and ethylenediamine hydrochloride concentration.The kinetic equations for ethylenediamine hydrochloride and calcium hydroxide were established based on the shrinking core model.The experimental data was analyzed to determine the activation energy of the reaction process,revealing that in-ternal diffusion primarily controlled the neutralization reaction between ethylenediamine hydrochloride and calcium hydrox-ide.The kinetic model Kt=1-3(1-x)2/3+2(1-x)was applied,giving an activation energy of 30.89 kJ/mol.This study estab-lished a valuable empirical foundation for extracting anhydrous ethylenediamine from the by-product of ethylenediamine hy-drochloride.
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