Thermodynamic study on synthesis process of vinyl ether series products
Vinyl ether is an important polymeric monomer,but the systematic thermodynamic analysis of its synthesis has not been reported.By utilizing Benson and Joback method and other methods respectively,based on classical thermodynamic formulas,the thermodynamic parameters of corresponding vinyl ethers compounds(vinyl methyl ether,vinyl ethyl ether,vinyl butyl ether,vinyl isobutyl ether and vinyl tert-butyl ether)synthesized from acetylene with different alcohols(methanol,ethanol,butanol,isobutyl alcohol and tert-butyl alcohol)were calculated,including enthalpy change(∆rHθ),entropy change(∆rSθ),molar Gibbs free energy(∆rGθ)and reaction equilibrium constant(K)at 283 K to 363 K.The difficulty of nucleophilic addition reactions between acetylene and alcohols of different structures,and the thermodynamic reaction rules,were systematically analyzed and summarized.The results show that all the reactions are highly exothermic and can occur spontaneously,and the lower the reaction temperature,the more thorough the reaction will be.Even at near room temperature(283 K)conditions,vinyl ether compounds can still be synthesized smoothly,and the lower the reaction temperature,the higher the safety.The results of this study can provide theoretical guidance for the industrial production of vinyl ethers.
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