【摘要】 以Fischer-Tropsch合成轻馏分油（F-TLD）为原料,正壬烷（C₉）和正十二烷(C₁₂)为参照,采用尿素络合法分离油品中的正构烷烃。利用FTIR和TG-DTG手段研究了尿素络合物（UIC）在氮气氛围中的固相热分解动力学,同时以不同碳链长度正构烷烃尿素络合物(C₉-UIC和C₁₂-UIC)的动力学结果作参照,采用Coats-Redfern法和Doyle法求取相关参数并确定反应机理。实验结果表明,F-TLD-UIC与C₉-UIC,C₁₂-UIC的热分解动力学研究结果具有一致性;UIC在氮气氛围中的热分解反应为一级反应,属于以Avrami-Erofeev的随机成核和随后生长机理为控制步骤的A1机理;用相关性较好的Doyle法求得F-TLD-UIC,C₉-UIC,C₁₂-UIC的热分解活化能分别为104.56,115.28,118.97 kJ/mol,F-TLD-UIC的热力学参数焓变、熵变及摩尔自由能分别为101.50 kJ/mol,-73.95 J/（mol·K）,128.75 kJ/mol。更多还原

【Abstract】 Taking n-nonane（C₉） and n-dodecane(C₁₂) as references,n-alkanes were separated by urea inclusion method from Fischer-Tropsch synthesized light distillates（F-TLD）.The thermal decomposition kinetics of urea inclusion compounds（UIC） and the referred n-alkanes-UIC with different carbon chain lengths such as C₉-UIC and C₁₂-UIC,were all studied by FTIR and TG-DTG in nitrogen atmosphere.Coats-Redfern and Doyle methods were applied to calculate the related parameters and deduce the possible mechanism of the thermal decomposition reaction.The results show that the thermal decomposition kinetics of F-TLD-UIC is consistent with that of C₉-UIC and C₁₂-UIC,which follows the first order.It is showed that the process is quite agree with A1 mechanism,namely,a random nucleation and subsequent growth mechanism of Avrami-Erofeev as the control step.Solving by Doyle method,the data indicate that there is a good correlation.The thermal decomposition activation energy of F-TLD-UIC,C₉-UIC and C₁₂-UIC has been deduced to be 104.56,115.28 and118.97 kJ/mol,respectively,while the enthalpy,entropy and Gibbs free energy of the decomposition of F-TLD-UIC is 101.50 kJ/mol,-73.95 J/（mol·K） and 128.75 kJ/mol,respectively.更多还原