سال انتشار: ۱۳۸۲

محل انتشار: هشتمین کنگره ملی مهندسی شیمی ایران

تعداد صفحات: ۵

نویسنده(ها):

Mansooreh Soleimani – Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran
Hamid Modarress – Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran

چکیده:

An improved correlation is presented for the estimation of binary diffusion coefficients in various dilute polymer solutions. The correlation is based on the Stokes-Einstein equation with empirical corrections for the nonroundness and the size ratio of polymer and solvent molecules. These
corrections are computed from the UNIQUAC or UNIFAC group contribution R and Q parameters. The method works well for various polymer systems. The proposed correlation reduced the average error from 133% to 33%.