Abstract: In this work, a pair of group interaction parameters, aCCOH, CHO and aCHO, CCOH, used in the UNIFAC group contribution method, has been supplemented from experimental vapor-liquid equilibrium data of iso-butanol iso-butaldehyde system available from literature[5]. The UNIFAC method has heen used in phase equilibrium calculations for systems of n-and iso-butanol purification process with accuracy approaching or attaining that of results calculated by NRTL and other correlations. In view of the fact that the UNIFAC method is based upon the assumption of additive property of group properties, it is necessary to check the calculating results with a few experimental data and to make appropriate choice of the available group parameters.

摘要： 本文通过异丁醇-异丁醛体系汽液平衡的文献数据,增补了用于UNIFAC法的一对a_（CCOH,CHO）和a_（CHO,CCOH）基团相互作用参数。用UNIFAC法推算有关正、异丁醇精制系统的各类相平衡数据,其计算精确度接近或达到NRTL等方程的关联结果。由于此法基于基团性质加和性的假定,因此在具体应用时必须慎重地选择参数值,并用实验数据进行检验。