环己酮-醇二元系统超额焓测定和关联的研究

The Experimental Determination and Correlation of Excess Enthalpies of Binary Systems of Cyclohexanone with Different Alcohols

用MS-80型Calvet微热量计首次测定了环己酮+乙醇、+正丙醇、+正丁醇、+环戊醇、+环己醇系统在293.15、298.15、303.15及308.15K四个温度下的超额焓HE,并拟合为平滑方程,拟合方差很小.环己酮和醇组成的二元混合系统的超额焓在全浓度范围内都为正值,其最大值都处在醇浓度为50%附近.超额焓随着醇分子中含碳原子数的增多而增大;超额焓值受温度的影响很大,且随着温度的升高而增大.

The excess enthalpies of five binary systems of cyclohexanone separately with ethanol,n propanol,n butanol,cyclopentanol and cyclohexanol were determined at four different temperatures,293.15,298.15,303.15 and 308.15 K by the MS 80 calorimeter. The experimental excess enthalpies data can all be correlated to smooth equations and the standard deviations were all very small. The coefficients of the correlation equations were offered. It is found that all the excess enthalpies data for all the systems are positive in the range of the experimental concentrations and reach their maximums when the concentrations of alcohols are about 50%. The excess enthalpies data of 2 butanone with alcohols published in previous paper just has the same regularity. The excess enthalpies data increase with the number of carbon atom. It is obvious that excess enthalpies were affected greatly by the mixing temperatures,and the higher the temperatures are, the more the excess enthalpies.