碳氢化合物燃烧中间体Lennard-Jones系数的计算
发布时间:2019-06-15 19:43
【摘要】:在已有的基团贡献法公式的基础上,提出了一种新的基团贡献法公式,并通过拟合250种化合物(包括185种稳定化合物临界性质的实验值和65种自由基临界性质的计算值)的临界性质得到了40种基团的贡献值,并用于预测未知化合物的临界性质.选取了训练集以外的、有临界性质实验值的30种化合物作为独立测试集,用于验证所建模型对临界性质的预测能力,T_C和P_C平均绝对偏差分别为8.52%和16.83%.结果表明,预测结果和实验值相吻合,该模型可以用于大分子化合物及自由基的临界性质预测.根据临界性质与Lennard-Jones(L-J)系数的经验关系式,预测了碳氢化合物燃烧中间体的L-J系数,得到独立测试集46种碳氢化合物的L-J系数,与文献值接近,T_C和P_C的平均绝对偏差分别为9.88%和9.96%.比较了训练集中烷烃自由基·C_6H_(13)、烯烃自由基·C_5H_9和炔烃自由基·C_5H_7同分异构体的L-J系数,同时,将己烷自由基·C_6H_(13)与相似的邻近烷烃C_6H_(14)的L-J系数进行比较,发现同分异构体之间或相似化合物之间L-J系数有较大偏差.此外,对缺少L-J系数的114种常见碳氢化合物自由基进行了预测.这对于碳氢化合物的燃烧模拟及基元反应中压强相关的速率常数计算有重要意义.
[Abstract]:On the basis of the existing formula of group contribution method, a new formula of group contribution method is proposed, and the contribution values of 40 groups are obtained by fitting the critical properties of 250 compounds (including the experimental values of the critical properties of 185 stable compounds and the calculated values of 65 kinds of free radical critical properties), and they are used to predict the critical properties of unknown compounds. Thirty compounds with experimental values of critical properties outside the training set were selected as independent test sets to verify the prediction ability of the model for critical properties. The average absolute deviation of T 鈮,
本文编号:2500463
[Abstract]:On the basis of the existing formula of group contribution method, a new formula of group contribution method is proposed, and the contribution values of 40 groups are obtained by fitting the critical properties of 250 compounds (including the experimental values of the critical properties of 185 stable compounds and the calculated values of 65 kinds of free radical critical properties), and they are used to predict the critical properties of unknown compounds. Thirty compounds with experimental values of critical properties outside the training set were selected as independent test sets to verify the prediction ability of the model for critical properties. The average absolute deviation of T 鈮,
本文编号:2500463
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