3-庚酮+乙酸乙酯、3-庚酮+乙酸丁酯、3-庚酮+TBP、MIBK+TBP二元体系的过量摩尔体积和黏度

Excess molar volumes and viscosities for binary mixtures of 3-heptanone + ethyl acetate,3-heptanone + butyl acetate,3-heptanone + tributyl phosphate, and methyl isobutyl ketone + tributyl phosphate

常压下测定了3-庚酮+乙酸乙酯、3-庚酮+乙酸丁酯、3-庚酮+磷酸三丁酯(TBP)、4-甲基-2-戊酮(MI-BK)+磷酸三丁酯4个二元体系在293.15～318.15K下的密度和黏度值,计算了二元体系的过量摩尔体积VE和过量黏度Δη,并用Redlich-Kister方程对VE和Δη进行了关联。混合溶剂的黏度数据采用Orrick-Erbar(O-E)基团贡献法进行了关联和预测,增加了O-E方法中的(—O)3—PO基团贡献值。结果表明,O-E方法可根据现有的纯溶剂的黏度数据预测得到混合溶剂的黏度,平均误差小于15%。

Densities and viscosities of four binary mixtures of 3-heptanone ＋ ethyl acetate,3-heptanone ＋ butyl acetate,3-heptanone ＋ tributyl phosphate and methyl isobutyl ketone ＋ tributyl phosphate were determined from 293.15 K to 318.15 K under atmospheric pressure using Anton Paar DMA5000 vibrating-tube densimeter and Anton Paar AMVn automated micro viscometer.From the experimental data of density and viscosity,the excess molar volumes VE and viscosity deviation Δη were calculated and correlated with the Redlich-Kister polynomial equation.The viscosities of the mixtures were correlated by Orrick-Erbar（O-E）group-contribution method.And the new group-contribution parameters A and B for（—O）3—POgroup were obtained.The results show that the improved Orrick-Erbar equation is able to predict the viscosities for mixtures from their pure solvents and the deviation is acceptable in engineering applications.