马来酸酐与1,2-环己烷二羧酸二异丁酯的气液平衡

Isobaric Vapor-Liquid Equilibria of Maleic Anhydride-DIBE System Using a Small Modified Ebulliometer

采用小沸点仪测定了马来酸酐和1,2-环己烷二羧酸二异丁酯二元系统在不同配料组成条件下的温度与压力数据,并通过内插法得到不同压力下的温度与配料组成的数据.进一步采用单纯形法优化NRTL方程参数,推算了平衡气液相组成,发现该二元系统具有最高压力恒沸点,且该恒沸点随压力的变化显著.当压力降低至20kPa时,由温度随气相组成的变化趋势知该恒沸点将趋于消失.

T,p data for Maleic anhydride and DIBE(di isobutylhexahydrophthalate) at different feed compositions(q) have been measured with a small modified ebulliometer and T,q data under different pressures have been obtained through interpolation. The vapor liquid equilibrium data have been calculated by means of the parameters of NRTL equation optimized by the simplex method. The azeotropes are found to change obviously with the pressures. The azeotropes tend to disappear when the pressure is lowered to 20 kPa.