文献类型：期刊文献

英文题名：Liquid - Liquid coexistence curves of dimethyl carbonate + hexadecane and dimethyl carbonate + octadecane in the critical region

作者：Huang, Meijun[1]; Chen, Zhiyun[1]; Yin, Tianxiang[1]; Bai, Yongliang[1]; An, Xueqin[1]; Shen, Weiguo[1]

机构：[1] School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China

年份：2010

卷号：55

期号：10

起止页码：4378

外文期刊名：Journal of Chemical and Engineering Data

收录：EI(收录号：20104213313460)

语种：英文

外文关键词：Paraffins - Mean field theory - Carbonation - Liquids

摘要：The liquid-liquid coexistences of temperature vs refractive index (T-n), temperature vs mole fraction (T-x), and temperature vs volume fraction (T-φ) for dimethyl carbonate + hexadecane and dimethyl carbonate + octadecane have been determined within 10 K from the critical temperatures. The critical amplitudes B and the critical exponents β have been deduced from the coexistence curves. The results have also been analyzed to determine Wegner correction terms and to examine the asymmetric behavior of the diameters of the coexistence curves. Experimental values of β are consistent with the 3D Ising value in the whole temperature range investigated for (T-n) and (T-φ), while the tendency of crossover to the mean field value was detected for (T-x). The data of coexistence curves (T-x) were fitted with the crossover equation proposed by Anisimov and Sengers to obtain the crossover parameters. It was found that the contribution of the regular term was significant as the temperature was far away from the critical point and the value of effective critical exponent increased with the distance from the critical point, exhibiting the monotonic crossover from the Ising to the mean-field critical behaviors. ? 2010 American Chemical Society.