【摘要】 本文对三种金属环形填料(6毫米压延微孔θ环、鲍尔环和拉西环)和两种物系(正庚烷/甲苯,σ~+系统;苯/正庚烷,σ~-系统)进行实验研究。考察三种填料在精馏σ~+系统和σ~-系统时的传质单元高度Hog,结果表明,表面张力梯度对不同填料的Hog都有明显的影响,对拉西环的影响最大,对压延微孔θ环的影响最小。在分离σ~+系统时表面张力梯度对传质过程起促进作用,而分离σ~-系统时,表面张力梯度将降低传质效率。这些富有实际意义的结论在分离过程的设计中具有一定参考价值。更多还原

【Abstract】 Experiments have been made with two systems of n-heptane/toluene(σ-positi- ve)and benzene/n-heptane(σ-negative)to look into and compare the effect of surface tension gradients on the mass transfer performance of three types of metal ring packings,i.e.,6 mm θ-Cannon rings,Pall rings and Raschig rings.The distil- lation results show that the surface tension gradients have evident influence on the height of transfer units(Hog)of different packings.Among the three types of packings used in the experiments,the performance of Raschig rings is strongly influenced by the surface tension gradients,while that of Cannon rings relatively weekly due to the porous structure of surface.In separation of o-positive systems gradients in surface tension have promotive effects,while they will reduce mass transfer efficiencies in the separation of σ-negative system.It is suggested that the surface tension property of the system should be considered in the selection of the type of packing.更多还原