摘要
在精馏计算中,气液平衡数据(或活度系数),虽可通过实验得到,但对于多元体系这种实验是极为繁复的。目前虽可用各种模型来计算活度系数,但大都是属于以某种溶液理论为基础的半经验式,对不同体系的适用性也不同,都须通过实验验证,且所须基础数据的获得也并非容易。对于萃取精馏过程,至少为三元系,其中萃取溶剂属于基本不挥发组分,在各层塔板的量基本不变。因而用气液色谱柱来模拟萃取精馏塔将是可行的,用气相色谱法来测定溶剂存在下的挥发组分的活度系数,并进行关联,必然会比半经验方法推导更接近于真实,在精馏传质设计中更有意义。
For calculating the activity coefficients of the two volatile components in a 3 components system, a formula is derived form theoritical plate model, with this formula, we determine the GLC data of DNP-nC6-φH (cC_6~0, nC_7~0) and DNP-cC_6~0-nC_7~0 systems and calculate the activity coefficients. For temperature-effect and concentration effect, the GLC method seems more sensitive than the classical method.
