摘要
快速反应的反应精馏过程需要通过解反应—扩散方程得到其传质模型,而慢速反应、瞬时反应的反应精馏过程相当于普通多组分传质过程,只是瞬时反应的精馏过程其液相浓度必须满足平衡常数计算式。按双膜理论,假设仅在液相有反应、汽相无反应的情况下、用矩阵或直接求解反应—扩散方程,得到了反应精馏过程的传质模型。液相传质模型的表达式说明:液相中由于反应的存在,化学反应除了影响传质过程的传质系数外,还影响其推动力。
The mass transfer model for reactive distillation with slow or instantaneous reaction is the same as for conventional multicomponent mass transfer process, but the liquid concentration for the case with the instantaneous reaction should be compatible with chemical constant. Only the mass transfer model for reactive distillation with fast reaction has need to be derived from both diffusion and reaction equations. On the assumption that chemical reactions can only take place in liquid phase, the reaction-diffusion equations are solved directly or using matrix from the view point of the film theory with linearized kinetics of the reaction. The solution of Maxwell-Stefan equations for the vapour phase, within which no chemical reaction occurs, is obtained by using the multicomponent mass transfer coefficients matrix from binary ones. The result of the liquid phase mass transfer model shows that the chemical reactions in the liquid phase affect not only mass transfer coefficients but also the driving three for mass transfer.
出处
《天津大学学报》
EI
CAS
CSCD
1993年第4期30-36,共7页
Journal of Tianjin University(Science and Technology)
基金
国家教委博士点基金
关键词
反应传质
反应精馏
传质模型
mass transfer with reaction, reaction distillation, mass transfer model
