توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Modeling of ternary gas separation in hollow fiber membrane
نویسنده(ها): ، ، ،
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۶
A mathematical model was established to describe a hollow fiber membrane separator by ternary gases which including hydrogen, methane and carbon monoxide. This model can be used forsimulation, design and operation of membrane–based gas separation processes. The mathematicalmodel consists of equations for the conservation of mass and momentum, which allows the consideration of effects such as pressure drops and various flow patterns within the permeator. Themethod of solution for the set of differential equations employs finite difference which replaces each of the differential equations by the corresponding finite difference expression. In the current implementation, membrane modules with concurrent or countercurrent flows and permeate pressure drops can be handled. Numerical results covering effects of different feed and permeate pressures on the design and operation of hollow fiber permeator.<\div>

۲Influence of temperature and polymer mass fraction on density of polyetherimide solution in N–methyl–2–pyrrolidone and Chloroform solvents
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۵
The density values of polyetherimide solutions in N–methyl–2–pyrrolidone (NMP) and Chloroform solvents have been measured at T = (298.15, 303.15, 308.15, and 313.15) K. The range of (0.05–0.3)for PEI mass fraction in NMP and (0.05–0.28) in Chloroform have been selected. Apparent specificvolume of the polymer and solvent has been computed from experimental data. Influence of temperature and polymer mass fraction on density of polyetherimide solution have been investigated. Results show density of both solutions will decrease by increasing temperature linearly.Also Densityfollowed a linear behavior with solute mass fraction, but for NMP, density will increase by increasing solute mass fraction and for Chloroform it will decrease.<\div>

۳Critical concentration determination of polyetherimide membrane for gas separation
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۶
In preparation of gas separation membrane, polymer concentration is one of the most important variables which can change membrane morphology and behavior. It should be high as polymer chains engage with each other and made dense membrane for gas separation, in this concentrationviscosity of polymeric solution has quirk. This concentration is called critical concentration. The studies on gas permeation in Polyetherimide (PEI) dense film reveal that PEI exhibits impressively high selectivity for all important gas pairs, there are a few solvents for PEI, in this research critical concentration of PEI in N–methyl–2–pyrrolidone and chloroform have been investigated.<\div>
نمایش نتایج ۱ تا ۳ از میان ۳ نتیجه